Weakness

Weakness Symptoms & Signs

Medical Author:

Related
Symptoms & Signs

Weakness is a decrease in the strength in one or more muscles. In the strictest sense, the medical definition of weakness refers to loss of muscle strength, and this article is focused upon conditions that can result in a measurable loss of muscle function. Weakness may be generalized or may affect one muscle or muscle group exclusively. Diseases of the neuromuscular system, injuries, metabolic diseases, and toxins can all cause of measurable muscle weakness. Signs and symptoms of weakness can include trouble doing daily tasks, such as grooming or writing or problems with gait and loss of balance.

Many people use the term weakness as a synonym for tiredness, weariness, lack of energy or fatigue, although this is not technically correct. People suffering from certain medical conditions (for example, chronic fatigue, insomnia, cancer, heart disease, adrenal disease, or influenza) may describe feelings of total body weakness, referring to feelings of malaise or tiredness, even though no detectable loss of muscle strength is present.

Medically Reviewed by a Doctor on 3/28/2017

Health concern on your mind? Visit the Symptom Checker.

REFERENCE:

Kasper, D.L., et al., eds. Harrison's Principles of Internal Medicine, 19th Ed. United States: McGraw-Hill Education, 2015.

Pictures, Images, Illustrations & Quizzes
Causes of Weakness
    • 14 Warning Signs and Symptoms of Stroke Stroke is a major cause of death and disability in the US. Early identification and treatment of stroke helps reduce the risk of...learn more »
      In This Article
      14 Warning Signs and Symptoms of Stroke Article
      • What is a stroke?
      • What is FAST (recognizing stroke symptoms and signs early)?
      • What are FAST stroke symptoms and signs?
      • What are other signs and symptoms of stroke in men and women?
      • What are the signs and symptoms of a mini-stroke (TIA, transient ischemic attack)
      • What should I do if someone is exhibiting signs and symptoms of a stroke?
      • Which specialties of doctors treat strokes?
    • Addison's Disease Addison disease is a hormonal (endocrine) disorder involving destruction of the adrenal glands (small glands adjacent to the...learn more »
      In This Article
      Addison's Disease Article
      • Addison's disease facts*
      • What is Addison's disease?
      • How does Addison's disease occur?
      • What is cortisol?
      • How is cortisol regulated?
      • What is aldosterone?
      • What causes Addison's disease?
      • Primary adrenal insufficiency
      • Polyendocrine deficiency syndrome
      • Tuberculosis
      • Other causes of Addison's disease
      • Secondary adrenal insufficiency
      • What are the signs and symptoms of Addison's disease?
      • How is Addison's disease diagnosed?
      • How is Addison's disease treated?
      • Surgery
      • Pregnancy?
      • Patient education
      • For more information
    • Amyloidosis Amyloidosis is a group of diseases resulting from abnormal deposition of certain proteins (amyloids) in various bodily areas. The...learn more »
      In This Article
      Amyloidosis Article
      • Amyloidosis facts
      • What is amyloidosis?
      • What causes amyloidosis?
      • What are risk factors for amyloidosis?
      • What are amyloidosis symptoms and signs?
      • What health care specialists treat amyloidosis?
      • What tests do doctors use to diagnose amyloidosis?
      • What is the treatment for amyloidosis?
      • What are complications of amyloidosis?
      • What is the prognosis of amyloidosis? What is the life expectancy for patients with amyloidosis?
      • Is it possible to prevent amyloidosis?
      • Where can people find more information on amyloidosis?
    • Amyotrophic Lateral Sclerosis (ALS) Amyotrophic lateral sclerosis (ALS, Lou Gehrig's disease) is a neurological disease that progresses rapidly. The disease attacks...learn more »
      In This Article
      Amyotrophic Lateral Sclerosis (ALS) Article
      • Amyotrophic lateral sclerosis (ALS) facts*
      • What is amyotrophic lateral sclerosis (ALS)?
      • Who gets ALS?
      • What are the symptoms of ALS?
      • How is ALS diagnosed?
      • What causes ALS?
      • How is ALS treated?
      • What research is being done on ALS?
      • How can I help research for ALS?
      • Where can I get more information about ALS?
    • Ankle Pain Ankle pain is commonly due to a sprain or tendinitis. The severity of ankle sprains ranges from mild (which can resolve within...learn more »
      In This Article
      Ankle Pain Article
      • Ankle pain and ankle tendinitis facts
      • How is the ankle designed, and what is the ankle's function?
      • What causes ankle pain and ankle tendinitis?
      • What injuries can cause ankle pain, and how are they treated?
      • What diseases and conditions can cause ankle pain, and how are they treated?
      • What are associated symptoms and signs of ankle pain and ankle tendinitis?
      • How are ankle pain and ankle tendinitis diagnosed?
      • What is the prognosis for ankle pain and ankle tendinitis?
      • Is it possible to prevent ankle pain and ankle tendinitis?
    • Atrial Fibrillation Symptoms (AFib Warning Signs) Atrial fibrillation or AFib is a type of hear rhythm abnormality. Early warning signs and symptoms of atrial fibrillation...learn more »
      In This Article
      Atrial Fibrillation Symptoms (AFib Warning Signs) Article
      • What is atrial fibrillation?
      • What are the signs and symptoms of atrial fibrillation?
      • What does atrial fibrillation feel like?
      • Who is at risk for atrial fibrillation?
      • Are heart attack or stroke symptoms different from atrial fibrillation symptoms?
      • Do all types of atrial fibrillation have the same symptoms?
      • What is the treatment and management of atrial fibrillation symptoms?
      • What is the prognosis and life expectancy for a person with atrial fibrillation?
    • Atrial Fibrillation vs. Ventricular Fibrillation (AFib vs VFib ECG Strips) Atrial fibrillation (AFib) and ventricular fibrillation (VFib) are problems with the heart that cause abnormal heart rhythms....learn more »
      In This Article
      Atrial Fibrillation vs. Ventricular Fibrillation (AFib vs VFib ECG Strips) Article
      • What does “fibrillation” mean?
      • What are the main differences between AFib and VFib?
      • What are the main similarities between these two heart conditions?
      • What are AFib and VFib, and how do they affect the heart?
      • Is AFib or VFib more serious and dangerous?
      • Differences between how AFib and VFib feel to a person (signs and symptoms)
      • What causes these two heart diseases?
      • How do the EKG patterns differ for AFib and VFib?
      • What is the treatment for AFib and VFib?
      • Can these heart conditions be prevented?
      • What’s the life expectancy for someone with AFib or VFib?
      • Different terms and abbreviations used for atrial fibrillation and ventricular fibrillation
    • Bell's Palsy (Facial Nerve Problems) Paralysis Causes and Treatments Bell's palsy is one type of facial nerve paralysis. The 7th cranial nerve controls the muscles of the face, and although...learn more »
      In This Article
      Bell's Palsy (Facial Nerve Problems) Paralysis Causes and Treatments Article
      • Facial nerve problems and Bell's palsy definitions and facts
      • What is the facial nerve?
      • What are symptoms of a facial nerve problem?
      • What conditions affect the facial nerve?
      • How are the causes of facial nerve dysfunction diagnosed?
      • What is Bell's palsy?
      • How does a person get Bell's palsy?
      • Bell's palsy symptoms
      • Who gets Bell's palsy? How long does it last?
      • How is Bell's palsy treated? How is facial nerve paralysis treated?
      • Treatment options for eye problems
      • Surgical reconstruction options
      • Is there a cure for Bell's palsy? What is the prognosis for other facial nerve problems?
      • Can Bell's palsy and other facial nerve problems be prevented?
    • Botulism Botulism is an illness caused by a neurotoxin produced by the bacterium Clostridium botulinum. There are three types of botulism:...learn more »
      In This Article
      Botulism Article
      • Botulism facts
      • What is botulism?
      • What causes botulism?
      • What are risk factors for botulism?
      • How many kinds of botulism are there?
      • How serious is botulism?
      • How does botulism neurotoxin affect the body?
      • What kind of organism is Clostridium botulinum?
      • How common is botulism?
      • What are botulism symptoms and signs?
      • How soon do botulism symptoms appear?
      • What health specialists treat botulism?
      • How do health care professionals diagnose botulism?
      • What is the treatment for botulism?
      • What are complications from botulism?
      • What is the prognosis of people with botulism?
      • Is it possible to prevent botulism?
      • Is botulism neurotoxin really considered to be a potential biological weapon?
      • Why are botulism neurotoxins used as cosmetic treatments or treatments for some medical conditions?
    • Brain Cancer Cancers that form from brain tissue are called primary brain tumors. Brain tumors may be malignant (brain cancer) or benign....learn more »
      In This Article
      Brain Cancer Article
      • Brain cancer facts
      • What is brain cancer?
      • What are grades of brain cancers?
      • What are the types of brain cancers?
      • What are the stages of brain cancer?
      • What is metastatic brain cancer?
      • What causes brain cancer?
      • Do cell phones cause brain cancer?
      • What are brain cancer symptoms and signs?
      • What type of doctors treat brain cancer?
      • What tests do doctors use to diagnose brain cancer?
      • What is the treatment for brain cancer?
      • Are there any home remedies for brain cancer?
      • What are the side effects of brain cancer treatment?
      • What is the prognosis of treated brain cancer?
      • What can I do to help my family (and me) cope with my diagnosis of brain cancer?
      • Is it possible to prevent brain cancer?
      • Where can I get more information about my type of brain cancer?
    • Brain Lesions (Lesions on the Brain) A brain lesion is defined as an area of damaged brain. Brain lesions (lesions on the brain) are caused by: trauma,...learn more »
      In This Article
      Brain Lesions (Lesions on the Brain) Article
      • Brain lesions facts
      • Brain anatomy
      • What are brain lesions?
      • What causes brain lesions?
      • What are the types of brain lesions?
      • What are the signs and symptoms of brain lesions?
      • How are brain lesions diagnosed?
      • What is the treatment for brain lesions?
      • Can brain lesions be prevented?
      • What is the prognosis for brain lesions?
    • Carpal Tunnel Syndrome Carpal tunnel syndrome is a condition in which irritation of the wrist's median nerve causes tingling and numbness of the thumb,...learn more »
      In This Article
      Carpal Tunnel Syndrome Article
      • Carpal tunnel syndrome facts
      • What is carpal tunnel syndrome?
      • What conditions and diseases cause carpal tunnel syndrome?
      • What are carpal tunnel syndrome symptoms?
      • What tests do health-care professionals use to diagnose carpal tunnel syndrome?
      • What is the treatment for carpal tunnel syndrome? Is it possible to prevent carpal tunnel syndrome?
      • What are complications of carpal tunnel syndrome?
      • What is the prognosis for carpal tunnel syndrome?
      • Which specialists are involved in the care of patients with carpal tunnel syndrome?
    • Cerebral Palsy Cerebral palsy (CP) is an abnormality of motor function and postural tone acquired at an early age (even before birth). Cerebral...learn more »
      In This Article
      Cerebral Palsy Article
      • Cerebral palsy definition and facts
      • What is cerebral palsy?
      • What are causes of cerebral palsy?
      • What are symptoms and signs of cerebral palsy?
      • What are the types of cerebral palsy?
      • What is spastic cerebral palsy?
      • What is dyskinetic cerebral palsy?
      • What is ataxic cerebral palsy?
      • What is dystonic cerebral palsy?
      • What is choreoathetoid cerebral palsy?
      • What is hypotonic cerebral palsy?
      • What is mixed cerebral palsy?
      • What other conditions are associated with cerebral palsy?
      • How is a child evaluated for cerebral palsy?
      • How is cerebral palsy treated?
      • What are specific treatment plans for cerebral palsy?
      • What is the long-term outlook for patients with cerebral palsy?
    • Charcot-Marie-Tooth Disease (CMT) Charcot-Marie-Tooth disease is one of the most common inherited neurological disorders. Charcot-Marie-Tooth disease affects the...learn more »
      In This Article
      Charcot-Marie-Tooth Disease (CMT) Article
      • *Charcot-Marie-Tooth disease (CMT) facts
      • What is Charcot-Marie-Tooth disease?
      • What are the signs and symptoms of Charcot-Marie-Tooth disease? What is the prognosis of CMT?
      • What causes Charcot-Marie-Tooth disease?
      • What are the types of Charcot-Marie-Tooth disease?
      • How is Charcot-Marie-Tooth disease diagnosed?
      • How is Charcot-Marie-Tooth disease treated?
      • What research is being done?
      • Where can I get more information?
    • Chickenpox (Varicella) Chickenpox (chicken pox) is a contagious childhood disease caused by the varicella-zoster virus. Symptoms have an incubation...learn more »
      In This Article
      Chickenpox (Varicella) Article
      • Chickenpox facts
      • What is chickenpox? What causes chickenpox?
      • What are risk factors for chickenpox?
      • How does chickenpox spread? What is the contagious period for chickenpox?
      • What are chickenpox symptoms and signs? How long does chickenpox last?
      • What does chickenpox look like?
      • What types of specialists treat chickenpox?
      • What are treatment options for chickenpox?
      • Are there home remedies for chickenpox?
      • What are the possible complications of chickenpox?
      • Can a vaccine prevent chickenpox?
      • What is the prognosis of chickenpox?
    • Childhood Acute Lymphoblastic Leukemia (ALL) Childhood acute lymphoblastic leukemia is the most common type of cancer in children. Symptoms and signs include fever, easy...learn more »
      In This Article
      Childhood Acute Lymphoblastic Leukemia (ALL) Article
      • Childhood acute lymphoblastic leukemia (ALL) is a type of cancer in which the bone marrow makes too many immature lymphocytes (a type of white blood cell).
      • Family history and exposure to radiation may affect the risk of developing childhood ALL.
      • Possible signs of childhood ALL include fever and bruising.
      • Tests that examine the blood and bone marrow are used to detect (find) and diagnose childhood ALL.
      • Certain factors affect prognosis (chance of recovery) and treatment options.
      • In childhood ALL, risk groups are used instead of stages.
      • What is recurrent childhood acute lymphoblastic leukemia (ALL)?
      • There are different types of treatment for childhood acute lymphoblastic leukemia (ALL).
      • New types of treatment are being tested in clinical trials.
      • What is the treatment for recurrent childhood acute lymphoblastic leukemia (ALL)?
    • Colon Cancer Colon cancer is a malignancy that arises from the inner lining of the colon. Most, if not all, of these cancers develop from...learn more »
      In This Article
      Colon Cancer Article
      • Colon cancer facts
      • What is cancer?
      • What is the colon, and what does it do?
      • Where is the colon located?
      • How long is the human colon?
      • What is colorectal cancer?
      • What are the causes and risk factors of colon cancer?
      • What are the signs and symptoms of colon cancer?
      • What tests can be done to detect and diagnose colon cancer?
      • What are the stages of colon cancer?
      • What are the treatments for colon cancer?
      • What is the follow-up care for colon cancer?
      • What is the prognosis for patients with colorectal cancer?
      • What are colon cancer survival rates?
      • Is it possible to prevent colon cancer?
    • Concussion Concussion is a short-lived loss of brain function that is due to head trauma. There are two types of concussion, simple and...learn more »
      In This Article
      Concussion Article
      • What is concussion?
      • What causes concussion?
      • What are the types of concussion?
      • What are the signs and symptoms of concussion?
      • How is concussion diagnosed?
      • What is the treatment for concussion?
      • How can concussion prevented?
      • What is the future of concussion?
    • Connective Tissue Disease Connective tissue disease is when the body's connective tissues come under attack, possibly becoming injured by inflammation....learn more »
      In This Article
      Connective Tissue Disease Article
      • What is a connective tissue disease?
      • What causes connective tissue disease?
      • What are symptoms and signs of a connective tissue disease?
      • How are connective tissue diseases diagnosed?
      • What are genetic risk factors for developing connective tissue disease?
      • What autoimmune diseases are associated with connective tissue disease?
    • Creutzfeldt-Jakob Disease Creutzfeldt-Jakob disease (CJD) is a rare, degenerative, invariably fatal brain disorder. CJD generally appears in the later...learn more »
      In This Article
      Creutzfeldt-Jakob Disease Article
      • What is Creutzfeldt-Jakob disease (CJD)?
      • What are the symptoms of Creutzfeldt-Jakob disease?
      • How is CJD diagnosed?
      • How is Creutzfeldt-Jakob disease treated?
      • What causes Creutzfeldt-Jakob disease?
      • How is CJD transmitted?
      • How can people avoid spreading Creutzfeldt-Jakob disease?
      • What Creutzfeldt-Jakob disease research is taking place?
      • How can I help Creutzfeldt-Jakob disease research?
      • Where can I get more information?
    • Cysticercosis (Pork Tapeworm Infection) Cysticercosis is an infection caused by Taenia solium, the pork tapeworm. Symptoms include seizures, lethargy, nausea and...learn more »
      In This Article
      Cysticercosis (Pork Tapeworm Infection) Article
      • Cysticercosis (pork tapeworm infection) facts
      • What is cysticercosis?
      • What causes cysticercosis?
      • What are risk factors for cysticercosis?
      • How is cysticercosis transmitted?
      • What is the incubation period for cysticercosis?
      • Is cysticercosis contagious?
      • What are cysticercosis symptoms and signs?
      • What specialists treat cysticercosis?
      • How do health-care professionals diagnose cysticercosis?
      • What is the treatment for cysticercosis?
      • What are the complications of cysticercosis?
      • What is the prognosis of cysticercosis?
      • Is it possible to prevent cysticercosis?
    • Diabetic Neuropathy Diabetic neuropathy is a complication of diabetes that causes damage to the nerves; this is related to the blood glucose of the...learn more »
      In This Article
      Diabetic Neuropathy Article
      • Diabetic neuropathy facts
      • What is diabetic neuropathy?
      • What are the types of diabetic neuropathy?
      • What are the symptoms and signs of diabetic neuropathy?
      • How is diabetic neuropathy diagnosed?
      • What are treatments for diabetic neuropathy?
      • What are self-care measures to help relieve diabetic neuropathy?
      • Can diabetic neuropathy be prevented?
    • Dislocated Shoulder The shoulder is the most often dislocated joint in the body due to its mobility. Dislocation occurs when the head of the humerus...learn more »
      In This Article
      Dislocated Shoulder Article
      • Shoulder dislocation facts
      • What is dislocation of the shoulder? What causes a shoulder dislocation?
      • What are risk factors for a dislocated shoulder?
      • What types of doctors treat a dislocated shoulder?
      • What are the symptoms and signs of a dislocated shoulder?
      • How do physicians diagnose dislocated shoulders?
      • What are home remedies for a dislocated shoulder?
      • What is the treatment for a dislocated shoulder?
      • What happens after reduction of a shoulder dislocation?
      • What is appropriate follow-up following a shoulder dislocation? How long is the recovery time for a dislocated shoulder?
      • What are potential complications of a shoulder dislocation?
      • What is the prognosis of a shoulder dislocation?
      • Is it possible to prevent a dislocated shoulder?
    • Ebola (Ebola Virus Disease or Ebola Hemorrhagic Fever) Ebola hemorrhagic fever (HF) is an often-fatal disease that causes fever, headache, vomiting, diarrhea, sore throat, stomach...learn more »
      In This Article
      Ebola (Ebola Virus Disease or Ebola Hemorrhagic Fever) Article
      • Ebola hemorrhagic fever (Ebola virus disease) facts
      • What is Ebola hemorrhagic fever?
      • What is the history of Ebola hemorrhagic fever?
      • Is the Ebola virus contagious?
      • What causes Ebola hemorrhagic fever?
      • What are risk factors for Ebola hemorrhagic fever?
      • What are Ebola virus disease symptoms and signs?
      • What types of health care professionals treat Ebola hemorrhagic fever?
      • What is the contagious period for the Ebola virus?
      • What is the incubation period for the Ebola virus?
      • How do health care professionals diagnose Ebola hemorrhagic fever?
      • What is the medical treatment for Ebola hemorrhagic fever?
      • What are complications of Ebola hemorrhagic fever?
      • What is the prognosis of Ebola hemorrhagic fever?
      • Is it possible to prevent Ebola hemorrhagic fever? Is there an Ebola vaccine?
      • What is the latest research on Ebola hemorrhagic fever?
      • Where can people find more information about Ebola?
    • Fever Although a fever technically is any body temperature above the normal of 98.6 F (37 C), in practice, a person is usually not...learn more »
      In This Article
      Fever Article
      • Fever facts
      • What is a fever?
      • What causes a fever?
      • What are the signs and symptoms of a fever?
      • How do health-care professionals diagnose a fever?
      • How should someone take a temperature for fever?
      • What is the treatment for a fever?
      • What are home remedies for a fever?
      • When should someone seek medical care for a fever?
      • What kind of doctors treat a fever?
      • What are complications of a fever?
      • What is the prognosis for a fever?
      • Is it possible to prevent a fever?
      • Where can people find more information about fevers?
    • Food Allergy The most common food allergies are to eggs, nuts, milk, peanuts, fish, shellfish, strawberries and tomatoes. Symptoms and signs...learn more »
      In This Article
      Food Allergy Article
      • Food allergy facts
      • What is a food allergy?
      • What causes allergic reactions to food?
      • What are food allergy symptoms and signs?
      • What are food allergy risk factors?
      • Do infants and children have problems with food allergy?
      • What are the most common food allergies?
      • What is cross-reactivity?
      • What is oral allergy syndrome?
      • What is exercise-induced food allergy?
      • What conditions have mistakenly been attributed to food allergy?
      • What conditions mimic food allergy?
      • What types of health care specialists diagnose and treat food allergies?
      • How do health care professionals diagnose food allergies? What tests do health specialists use to diagnose food allergies?
      • What is the treatment for a food allergy?
      • Are allergy shots effective in preventing or decreasing food allergy?
      • What are complications of food allergies?
      • What is the prognosis (outlook) for food allergy?
      • What research is being done on food allergies?
    • Graft Versus Host Disease (GVHD) Graft versus host disease (GVHD) is a condition that happens when immune cells from transplanted donor tissue attack the...learn more »
      In This Article
      Graft Versus Host Disease (GVHD) Article
      • Graft-versus-host disease (GVHD) facts
      • What is graft-versus-host disease?
      • What causes graft-versus-host disease?
      • What are risk factors for GVHD?
      • What are graft-versus-host disease symptoms and signs? What are the types of GVHD?
      • What specialists treat GVHD?
      • What tests do health care professionals use to diagnose GVHD?
      • What are GVHD treatment options?
      • What is the prognosis of graft-versus-host disease?
      • Is it possible to prevent GVHD?
    • Guillain-Barre Syndrome Guillain-Barré Syndrome is an autoimmune disease of the nervous system due to damage to the myelin sheath around nerves....learn more »
      In This Article
      Guillain-Barre Syndrome Article
      • Guillain-Barré facts
      • What is Guillain-Barré syndrome?
      • What are the symptoms of Guillain-Barré syndrome?
      • What causes Guillain-Barré syndrome?
      • How is Guillain-Barré syndrome diagnosed?
      • How is Guillain-Barré syndrome treated?
      • What is the long-term outlook for those with Guillain-Barré syndrome?
      • What research is being done on Guillain-Barré syndrome?
      • Where can I get more information about Guillain-Barré syndrome?
    • HIV vs. AIDS Human immunodeficiency virus causes HIV infection. Acquired immunodeficiency syndrome (AIDS) is a condition that results after...learn more »
      In This Article
      HIV vs. AIDS Article
      • HIV vs. AIDS facts
      • What are causes and risk factors for HIV and AIDS?
      • What are the signs and symptoms of HIV and AIDS?
      • What tests do health care professionals use to diagnose HIV and AIDS?
      • What are treatments and medications for HIV and AIDS?
      • What is the prognosis of HIV and AIDS?
      • Is it possible to prevent HIV and AIDS?
    • Iron Deficiency Iron is a mineral our bodies need. Iron deficiency is a condition resulting from not enough iron in the body. It is the most...learn more »
      In This Article
      Iron Deficiency Article
      • Iron and iron deficiency facts*
      • What is iron and why do we need it?
      • What is iron deficiency and why is it a concern?
      • What causes iron deficiency?
      • Who is most at risk for iron deficiency?
      • What are the signs and symptoms of iron deficiency?
      • How is iron deficiency diagnosed?
      • How is iron deficiency treated?
      • Can iron deficiency be prevented?
      • Babies
      • Young children (aged 1-5 years)
      • Adolescent girls and women of childbearing age
      • Pregnant women
      • How much iron do I need?
      • What are dietary sources of iron?
      • Dietary sources of Vitamin C
      • Iron overload and hemochromatosis
    • Is MS Contagious? (Multiple Sclerosis) Multiple sclerosis, or MS, is a degenerative disease of the covering around the nerves in the central nervous system (CNS)....learn more »
      In This Article
      Is MS Contagious? (Multiple Sclerosis) Article
      • What is multiple sclerosis (MS)?
      • 4 Types of MS
      • Who gets multiple sclerosis, and how many people have it?
      • What are the signs and symptoms of MS?
      • Can you get MS from people who have it, and can it passed on to children?
      • How will I know if I have MS, and when should I contact my doctor if I think I may have the condition?
      • What treatments are available for MS and its symptoms?
    • Kidney Infection (Pyelonephritis) Kidney infection (pyelonephritis) usually is caused from bacteria that have spread from the bladder from a UTI (urinary tract...learn more »
    • Knee Injury Knee injuries, especially meniscus tears, are common in contact sports. Symptoms and signs of a torn meniscus include knee pain,...learn more »
      In This Article
      Knee Injury Article
      • Knee injury facts
      • What are the different types of knee injuries?
      • What causes a knee injury?
      • What are risk factors for a knee injury?
      • What are knee injury symptoms and signs?
      • What specialists treat knee injuries?
      • How do health-care professionals diagnose a knee injury?
      • What are home remedies for a knee injury?
      • What is the medical treatment for a knee injury?
      • What exercises are recommended, and what exercises should be avoided during rehabilitation for a knee injury?
      • What is the recovery time for a knee injury?
      • What is the prognosis of a knee injury?
      • What are complications of knee injuries?
      • Is it possible to prevent knee injuries?
    • Lassa Fever Lassa fever is a viral hemorrhagic fever that causes flu-like symptoms. Ribavirin is the standard treatment for Lassa fever....learn more »
      In This Article
      Lassa Fever Article
      • Lassa fever facts
      • What is Lassa fever?
      • What is the history of Lassa fever?
      • What are causes and risk factors for Lassa fever?
      • Is Lassa fever contagious? If so, what is the contagious period for Lassa fever?
      • When is Lassa fever no longer contagious?
      • What is the incubation period for Lassa fever?
      • What are Lassa fever symptoms and signs?
      • How do physicians diagnose Lassa fever?
      • What is the treatment for Lassa fever?
      • What are complications for Lassa fever?
      • What is the prognosis of Lassa fever?
      • Is it possible to prevent Lassa fever? Is there a vaccine for Lassa fever?
      • What research is being done on Lassa fever?
      • Where can people find more information on Lassa fever?
    • Lumbar Spinal Stenosis Lumbar stenosis can be caused by degenerative arthritis (the most common cause), tumor, infection, or metabolic disorders...learn more »
      In This Article
      Lumbar Spinal Stenosis Article
      • Lumbar spinal stenosis facts
      • What is the lumbar spine, and what is lumbar spinal stenosis?
      • What causes lumbar spinal stenosis?
      • What are risk factors for lumbar spinal stenosis?
      • What are lumbar spinal stenosis symptoms?
      • How do health-care professionals diagnose lumbar spinal stenosis?
      • What is the treatment for lumbar spinal stenosis?
      • Is it possible to prevent lumbar spinal stenosis?
      • What is the prognosis for lumbar spinal stenosis?
    • Malaria Malaria is a disease that is spread by the bite of an infected Anopheles mosquito. Malaria symptoms include fever, chills,...learn more »
      In This Article
      Malaria Article
      • Malaria facts
      • What is malaria?
      • Is malaria contagious?
      • What is the incubation period for malaria?
      • What causes malaria?
      • What are malaria symptoms and signs?
      • What specialists treat malaria?
      • How do physicians diagnose malaria?
      • What is the treatment for malaria?
      • Can malaria reoccur after treatment?
      • What is the prognosis of malaria?
      • Is there a malaria vaccine?
      • How can people prevent malaria?
    • Marfan Syndrome Marfan syndrome is hereditary (genetic) condition affecting connective tissue. A person with Marfan syndrome may exhibit the...learn more »
      In This Article
      Marfan Syndrome Article
      • Marfan syndrome definition and facts*
      • What do some of the characteristics of Marfan syndrome look like (pictures)?
      • What is Marfan syndrome?
      • Who gets this syndrome?
      • What are the symptoms of Marfan syndrome?
      • What causes Marfan syndrome?
      • How is Marfan syndrome diagnosed?
      • What types of doctors treat Marfan syndrome?
      • What treatment options are available for Marfan syndrome?
      • What are some of the emotional and psychological effects of Marfan syndrome?
      • What research is being conducted on Marfan syndrome?
      • Where can people find additional information about Marfan syndrome?
    • Meningitis Encephalitis is a brain inflammation that causes sudden fever, vomiting, headache, light sensitivity, stiff neck and back,...learn more »
      In This Article
      Meningitis Article
      • Encephalitis and meningitis facts
      • What is encephalitis?
      • What causes encephalitis?
      • What are encephalitis symptoms and signs?
      • Is encephalitis contagious?
      • Is it possible to prevent encephalitis? Is there an encephalitis vaccine?
      • What is meningitis?
      • What causes meningitis?
      • What are meningitis symptoms and signs?
      • What is encephalomyelitis?
      • What are the risk factors for encephalitis and meningitis?
      • What specialties of doctors treat encephalitis and meningitis?
      • How do health-care professionals diagnose encephalitis and meningitis?
      • What is the treatment of encephalitis and meningitis?
      • What is the prognosis (outlook), and what are the complications for patients with encephalitis or meningitis?
      • Is meningitis contagious?
      • Is it possible to prevent meningitis? Is there a meningitis vaccine?
    • Migraine Headache Migraine headaches are severe headaches that are sensitive to light, sounds, and smells. Some people who suffer from...learn more »
      In This Article
      Migraine Headache Article
      • Migraine headache definition and facts
      • What is a migraine headache?
      • What is migraine with aura?
      • What are migraine triggers?
      • What are the signs and symptoms?
      • What causes migraines?
      • What are the risk factors?
      • How can I tell if it's a migraine or a different type of headache?
      • What are the treatments for migraine headaches?
      • Migraine medications
      • What remedies and lifestyle changes help manage and decrease the frequency of migraines?
      • How are migraines managed during pregnancy?
      • How are migraines managed in children?
      • What is the prognosis for a person with migraines?
      • Can the frequency of headaches be prevented?
    • Multiple Myeloma Multiple myeloma is a form of cancer that develops in plasma cells, the white blood cells that make antibodies. Symptoms include...learn more »
      In This Article
      Multiple Myeloma Article
      • Multiple myeloma facts
      • What is multiple myeloma? What are plasma cells?
      • What causes multiple myeloma?
      • What are risk factors for multiple myeloma? Is multiple myeloma hereditary?
      • What are multiple myeloma symptoms and signs?
      • What tests do health care professionals use to make a diagnosis of multiple myeloma?
      • What types of health care professionals treat multiple myeloma?
      • What are the stages of multiple myeloma?
      • What is the medical treatment for multiple myeloma?
      • What are lifestyle and diet tips for people with multiple myeloma?
      • What is the prognosis for multiple myeloma? What is the survival rate for multiple myeloma?
      • Is it possible to prevent multiple myeloma?
      • What support systems are available for multiple myeloma?
      • What is the latest research on multiple myeloma?
    • Multiple Sclerosis (MS Symptoms, Causes, and Life Expectancy) Multiple sclerosis or MS is an autoimmune disorder in which brain and spinal cord nerve cells become demyelinated. This damage...learn more »
    • Muscle Spasms Muscle spasms are involuntary muscle contractions that come on suddenly and are usually quite painful. Dehydration, doing...learn more »
    • Myasthenia Gravis Myasthenia gravis, a chronic autoimmune neuromuscular disease. Varying degrees of weakness of the voluntary muscles of the body...learn more »
      In This Article
      Myasthenia Gravis Article
      • Myasthenia gravis facts*
      • What is myasthenia gravis?
      • What causes myasthenia gravis?
      • What is the role of the thymus gland in myasthenia gravis?
      • What are myasthenia gravis symptoms and signs?
      • Who gets myasthenia gravis?
      • How is myasthenia gravis diagnosed? What tests are used?
      • What is the treatment for myasthenia gravis?
      • What are myasthenic crises?
      • What is the prognosis for myasthenia gravis?
      • What research is being done on myasthenia gravis?
      • Where can I get more information on myasthenia gravis?
    • Non-Hodgkin's Lymphoma Non-Hodgkin's lymphoma is cancer of the lymphatic system, a vital part of the body's immune system. Symptoms and signs include...learn more »
      In This Article
      Non-Hodgkin's Lymphoma Article
      • Non-Hodgkin's lymphoma (NHL) facts
      • What is non-Hodgkin's lymphoma?
      • What is the difference between non-Hodgkin's lymphoma and Hodgkin's disease (or Hodgkin's lymphoma)?
      • What causes non-Hodgkin's lymphoma?
      • What are non-Hodgkin's lymphoma risk factors?
      • What are non-Hodgkin's lymphoma symptoms and signs?
      • What kind of doctors treat non-Hodgkin's lymphoma?
      • How do physicians diagnose non-Hodgkin's lymphoma?
      • What are the types of non-Hodgkin's lymphoma, and how is non-Hodgkin's lymphoma staging determined?
      • What is the treatment for non-Hodgkin's lymphoma?
      • What is the prognosis and survival rate for non-Hodgkin's lymphoma?
      • Is it possible to prevent non-Hodgkin's lymphoma?
      • What is the latest research on non-Hodgkin's lymphoma?
      • Where can people find more information about non-Hodgkin's lymphoma?
    • Norovirus Infection Norovirus infection causes stomach flu, or gastroenteritis. It's a very contagious illness with symptoms that include nausea and...learn more »
    • Peripheral Vascular Disease Peripheral vascular disease (PVD) refers to diseases of the blood vessels (arteries and veins) located outside the heart and...learn more »
      In This Article
      Peripheral Vascular Disease Article
      • Peripheral vascular disease (PVD) definition and facts
      • What is peripheral vascular disease (PVD)?
      • Are atherosclerosis and peripheral vascular disease related?
      • What are the signs and symptoms of peripheral artery disease (PVD)?
      • Who is at risk for peripheral artery disease (PVD)?
      • How does atherosclerosis cause disease?
      • What are the other causes of peripheral vascular diseases?
      • Is there a test to diagnose peripheral artery disease (PVD)?
      • What are the management and treatment guidelines for peripheral vascualr disease (PVD)?
      • Medications to treat peripheral vascular disease (PVD)
      • Angioplasty to treat peripheral vascular disease (PVD)
      • Surgery to treat peripheral vascular disease (PVD)
      • Which specialties of doctors treat peripheral vascular disease (PVD)?
      • What are potential complications of peripheral artery disease (PVD)?
      • How can I prevent from getting peripheral vascular disease (PVD)?
    • Plague (Black Death) Plague is an infectious disease caused by the bacteria Yersinia pestis. Transmission to humans occurs via fleas that have bitten...learn more »
      In This Article
      Plague (Black Death) Article
      • Plague (Black Death) facts
      • What is plague? What is the history of plague?
      • What causes plague?
      • What are risk factors for plague?
      • What is the incubation period for plague?
      • What are plague symptoms and signs? What are the different types of plague?
      • Is plague contagious? How is plague transmitted?
      • What is the contagious period for pneumonic plague?
      • How do physicians diagnose plague?
      • What is the treatment for plague?
      • What is the prognosis of plague?
      • Is it possible to prevent plague? Is there a plague vaccine?
      • Could plague be used as a biological weapon?
    • Polymyalgia Rheumatica Polymyalgia rheumatica (PMR) is a disorder of the muscles and joints that causes pain and stiffness in the arms, neck, shoulders,...learn more »
      In This Article
      Polymyalgia Rheumatica Article
      • Polymyalgia rheumatica (PMR) facts
      • What is polymyalgia rheumatica?
      • What are polymyalgia rheumatica causes and risk factors?
      • What are common symptoms and signs of polymyalgia rheumatica?
      • How do health care professionals make a diagnosis of polymyalgia rheumatica?
      • What is the medical treatment for polymyalgia rheumatica?
      • What is the prognosis for patients with polymyalgia rheumatica?
      • Is it possible to prevent polymyalgia rheumatica?
      • What are polymyalgia rheumatica complications?
    • Postherpetic Neuralgia Postherpetic neuralgia (PHN) is a painful complication of shingles. Symptoms include: severe pain, itchy skin, and...learn more »
      In This Article
      Postherpetic Neuralgia Article
      • Postherpetic neuralgia (PHN) facts
      • What is postherpetic neuralgia (PHN)?
      • What causes postherpetic neuralgia?
      • What are postherpetic neuralgia symptoms and signs?
      • What are the risk factors for postherpetic neuralgia?
      • How is postherpetic neuralgia diagnosed?
      • How is postherpetic neuralgia treated?
      • How long does postherpetic neuralgia last?
      • What are the complications of postherpetic neuralgia?
      • What is the prognosis for postherpetic neuralgia?
      • Can postherpetic neuralgia be prevented?
    • Powassan Virus Disease Powassan (POW) virus disease is a rare tick-borne disease that causes symptoms such as confusion, memory problems, fever,...learn more »
      In This Article
      Powassan Virus Disease Article
      • Powassan virus (POW virus) facts
      • What are the types of Powassan virus (POW virus)?
      • What is Powassan virus disease?
      • What causes Powassan virus disease?
      • What are risk factors for Powassan virus disease?
      • Where have most incidences of Powassan virus disease occurred?
      • What are signs and symptoms of Powassan virus disease?
      • What tests do health care professionals use to diagnose Powassan virus disease?
      • What is the treatment for Powassan virus disease?
      • Are there home remedies for Powassan virus disease?
      • What are complications of Powassan virus disease?
      • What is the prognosis for Powassan virus disease?
      • Is it possible to prevent Powassan virus disease?
    • Rocky Mountain Spotted Fever (RMSF) Rocky Mountain spotted fever is a tick-borne disease that causes symptoms and signs such as fever, rash, headache, and muscle...learn more »
      In This Article
      Rocky Mountain Spotted Fever (RMSF) Article
      • Rocky Mountain spotted fever facts
      • What is Rocky Mountain spotted fever?
      • Where do most cases of RMSF occur in the U.S.?
      • What causes Rocky Mountain spotted fever?
      • How is Rocky Mountain spotted fever transmitted?
      • What are Rocky Mountain spotted fever risk factors?
      • Is Rocky Mountain spotted fever contagious?
      • What are Rocky Mountain spotted fever symptoms and signs?
      • What is the incubation period for Rocky Mountain spotted fever?
      • What specialists treat Rocky Mountain spotted fever?
      • How do health-care providers diagnose Rocky Mountain spotted fever?
      • What is the treatment for Rocky Mountain spotted fever?
      • What is the prognosis of Rocky Mountain spotted fever?
      • What are the long-term effects of Rocky Mountain spotted fever?
      • Is there a vaccine for Rocky Mountain spotted fever?
      • Is it possible to prevent Rocky Mountain spotted fever?
    • Rotator Cuff Disease Rotator cuff disease is damage to any of the four tendons that stabilize the shoulder joint. Shoulder pain and tenderness are...learn more »
      In This Article
      Rotator Cuff Disease Article
      • Rotator cuff disease facts
      • What is the rotator cuff?
      • What causes rotator cuff disease?
      • What are risk factors for rotator cuff disease?
      • How is the rotator cuff injured?
      • What are rotator cuff disease symptoms and signs?
      • How do health-care professionals diagnose rotator cuff disease?
      • What is the treatment for rotator cuff disease?
      • Are there home remedies for rotator cuff disease?
      • What are complications of rotator cuff disease?
      • What specialists treat rotator cuff disease?
      • What is the prognosis (outlook) for rotator cuff disease?
      • Is it possible to prevent rotator cuff disease?
    • Salivary Gland Cancer Salivary gland cancer is cancer that affects the parotid glands, sublingual glands, or the submandibular glands. Risk factors...learn more »
      In This Article
      Salivary Gland Cancer Article
      • Salivary gland cancer facts
      • What is salivary gland cancer?
      • What are causes and risk factors of salivary gland cancer?
      • What are symptoms and signs of salivary gland cancer?
      • What exams and tests are used to detect and diagnose salivary gland cancer?
      • What is the prognosis for salivary gland cancer?
      • What tests are done to determine if salivary gland cancer has spread?
      • How does salivary gland cancer spread in the body?
      • What are the stages for salivary gland cancer?
      • What is the treatment for salivary gland cancer?
      • How does staging affect treatment options?
    • Shock (Medical) Medical shock is a life-threatening medical condition. There are several types of medical shock, including: septic shock,...learn more »
      In This Article
      Shock (Medical) Article
      • Shock facts
      • What is shock?
      • What are the types of shock?
      • What are the causes of shock?
      • What are the symptoms of shock?
      • When should I seek medical care for shock?
      • What is the treatment for shock?
      • Can shock be prevented?
      • What is the outlook for shock?
    • Spondylolisthesis The five types of spondylolisthesis include dysplastic, isthmic, degenerative, traumatic, and pathologic. The most common symptom...learn more »
      In This Article
      Spondylolisthesis Article
      • Spondylolisthesis facts
      • What is spondylolisthesis?
      • What causes spondylolisthesis?
      • What are the risk factors for spondylolisthesis?
      • What are spondylolisthesis symptoms?
      • What types of doctors treat spondylolisthesis?
      • How do doctors diagnose spondylolisthesis? How is the grading determined for spondylolisthesis?
      • What is the treatment for spondylolisthesis? What type of surgery treats spondylolisthesis?
      • What are the complications of spondylolisthesis?
      • What is the prognosis for spondylolisthesis?
      • Is it possible to prevent spondylolisthesis?
    • Stroke (Signs, Symptoms, Warning Signs) A stroke is an interruption of the blood supply to part of the brain caused by either a blood clot (ischemic) or bleeding...learn more »
      In This Article
      Stroke (Signs, Symptoms, Warning Signs) Article
      • Stroke definition and facts
      • What is a stroke?
      • What is the NIH Stroke Scale?
      • What are the risk factors for stroke?
      • What are the warning signs and symptoms of a stroke?
      • What are the signs and symptoms of a stroke?
      • What is a transient ischemic attack (TIA)?
      • What are the types of stroke?
      • What causes a stroke?
      • What tests diagnose stroke?
      • What is the treatment for stroke?
      • Is recovery after a stroke possible?
      • What is stroke rehabilitation?
      • What is the prognosis for a person that suffers a stroke?
      • Which specialties of doctors treat stroke?
      • Can strokes be prevented?
    • Tennis Elbow (Lateral Epicondylitis) Tennis elbow is also known as lateral epicondylitis. Symptoms of tennis elbow include tenderness and dull pain of the outer...learn more »
      In This Article
      Tennis Elbow (Lateral Epicondylitis) Article
      • Tennis elbow facts
      • What is tennis elbow?
      • What causes tennis elbow?
      • What are tennis elbow risk factors?
      • What are symptoms of tennis elbow?
      • How do physicians diagnose tennis elbow?
      • What is the treatment for tennis elbow?
      • What is the outlook (prognosis) for tennis elbow?
      • Is it possible to prevent tennis elbow?
    • Tension Headache A tension headache s one of the most common types of headaches, and the exact cause is not known. Factors that may contribute to...learn more »
      In This Article
      Tension Headache Article
      • Tension headache facts
      • What is a tension headache?
      • What causes tension headaches?
      • What are the symptoms of tension headache?
      • How are tension headaches diagnosed?
      • What is the treatment for tension headache?
      • Prescription medications for tension headaches
      • OTC drugs for tension headaches
      • Managing stress
      • Are there effective home remedies a cure for tension headache?
      • Can tension headaches be prevented?
    • Thoracic Outlet Syndrome (TOS) Thoracic outlet syndrome is a condition where symptoms are produced from compression of nerves or blood vessels because the...learn more »
      In This Article
      Thoracic Outlet Syndrome (TOS) Article
      • Thoracic outlet syndrome facts
      • What is thoracic outlet syndrome?
      • What causes thoracic outlet syndrome?
      • What are thoracic outlet syndrome risk factors?
      • What are thoracic outlet syndrome symptoms and signs?
      • What tests do physicians use to diagnose thoracic outlet syndrome?
      • What is the treatment for thoracic outlet syndrome? What are medications for thoracic outlet syndrome? Is surgery necessary for TOS?
      • What are home remedies for thoracic outlet syndrome?
      • What types of doctors treat thoracic outlet syndrome?
      • What is the prognosis for thoracic outlet syndrome?
      • Is it possible to prevent thoracic outlet syndrome?
    • Ticks Ticks are known transmitters of disease to humans and animals. Tick-borne diseases include Lyme disease, Rocky Mountain spotted...learn more »
    • Torn Meniscus A torn meniscus (knee cartilage) may be caused by suddenly stopping, sharply twisting, or deep squatting or kneeling when lifting...learn more »
    • Viral Hemorrhagic Fever Viral hemorrhagic fever(s), or VHFs are a group of illnesses caused by distinct families of viruses. Many of these viruses are...learn more »
      In This Article
      Viral Hemorrhagic Fever Article
      • Viral hemorrhagic fever (VHF) facts*
      • What are viral hemorrhagic fevers?
      • How are hemorrhagic fever viruses grouped?
      • What carries viruses that cause viral hemorrhagic fevers?
      • Where are cases of viral hemorrhagic fever found?
      • How are hemorrhagic fever viruses transmitted?
      • What are the signs and symptoms and signs of viral hemorrhagic fever illnesses?
      • How do health care professionals treat patients with viral hemorrhagic fever?
      • How can cases of viral hemorrhagic fever be prevented and controlled?
      • What needs to be done to address the threat of viral hemorrhagic fevers?
    • Vitamin D Deficiency Vitamin D deficiency has been linked with rickets, cancer, cardiovascular disease, severe asthma in children and cognitive...learn more »
    • West Nile Virus West Nile virus (West Nile encephalitis) is a brain infection caused by a virus. People become infected with the virus after...learn more »
      In This Article
      West Nile Virus Article
      • West Nile virus facts
      • What is the history of West Nile virus?
      • Where did the West Nile virus come from?
      • How do people get West Nile virus?
      • How do mosquitoes get infected with the West Nile virus?
      • Is the West Nile virus contagious?
      • Besides mosquitoes, can other insects transmit the West Nile virus?
      • Are there other viruses like the West Nile virus?
      • What are West Nile virus infection symptoms and signs?
      • When is there an increased risk for West Nile virus infection?
      • Who is at risk for getting a West Nile virus infection?
      • What is the treatment for West Nile virus? Is it possible to prevent West Nile virus infection with a vaccine?
      • Is a woman's pregnancy at risk if she gets infected with the West Nile virus?
      • What can a community do to reduce the risk of an outbreak of the West Nile virus?
      • What can a person do to reduce the risk of becoming infected with the West Nile virus?
    • Yellow Fever Yellow fever is an infectious disease transmitted by infected mosquitoes. Side effects are rare with the yellow fever vaccine....learn more »
      In This Article
      Yellow Fever Article
      • Yellow fever facts
      • What is yellow fever? What is the history of yellow fever?
      • What causes yellow fever?
      • How is yellow fever transmitted?
      • What areas are high risk for contracting yellow fever?
      • What is the incubation period for yellow fever?
      • Is yellow fever contagious? How long is the contagious period for yellow fever?
      • What types of specialists treat yellow fever?
      • What are yellow fever symptoms and signs?
      • How do health-care professionals diagnose yellow fever?
      • What is the treatment for yellow fever?
      • How long does yellow fever last?
      • What is the prognosis for people with yellow fever?
      • Is it possible to prevent yellow fever?
      • What are the side effects of the yellow fever vaccine?
      • Where can people get more information on yellow fever?
Other Causes of Weakness
  • Congenital Myopathies
  • Electrolyte Imbalances
  • Malignant Tumors
  • Malnutrition
  • Muscle Disease Medications
  • Muscular Dystrophy
  • Myotonic Dystrophy
  • Nerve Impingement
  • Poisoning (Organophosphates)
  • Poliomyelitis
  • Thyrotoxicosis
  • Trauma
Examples of Medications for Weakness


Symptoms & Signs A-Z List