MedicineNet.com

About Us|Privacy Policy|Site Map
February 22, 2012

Anaphylaxis
(Severe Allergic Reaction)

Medical Author:
Medical Editor:

Anaphylaxis facts

  • Anaphylaxis is the most severe allergic reaction and is potentially life threatening.
  • Anaphylaxis is rare. The vast majority of people will never have an anaphylactic reaction.
  • If you are at risk, avoidance is the best form of treatment.
  • If you have a history of serious allergic reaction, always have an epinephrine kit available; it could save your life.

Introduction to anaphylaxis

Anaphylaxis refers to a rapidly developing and serious allergic reaction that affects a number of different body systems at one time. Severe anaphylactic reactions can be fatal. Although many patients experience minor allergy symptoms, a small number of people are susceptible to a severe reaction that can lead to shock or even death.

Anaphylaxis is often triggered by substances that are injected or ingested and thereby gain access into the bloodstream. An explosive reaction involving the skin, lungs, nose, throat, and gastrointestinal tract can then result. Although severe cases of anaphylaxis can occur within seconds or minutes of exposure and be fatal if untreated, many reactions are milder and can be ended with prompt medical therapy.



Patient Discussions

Viewers share their comments

Anaphylaxis - Symptoms and Signs Question: What symptoms and signs did you experience with your anaphylaxis?
Anaphylaxis - Describe Your Experience Question: Please describe your experience with anaphylaxis

MedicineNet Doctors

Suggested Reading on Anaphylaxis by Our Doctors

  • Related Diseases & Conditions

    • Anxiety
      • Anxiety is a feeling of apprehension and fear characterized by physical symptoms. Anxiety disorders are serious medical illnesses that affect approximately 19 million American adults.
    • Hives
      • Hives, also called urticaria, is a raised, itchy area of skin that is usually a sign of an allergic reaction. The allergy may be to food or medications, but usually the cause of the allergy (the allergen) is unknown.
    • Nausea and Vomiting
      • Nausea is an uneasiness of the stomach that often precedes vomiting. Nausea and vomiting are not diseases, but they are symptoms of many conditions. The causes of vomiting differ according to age, and treatment depends upon the cause of nausea and vomiting.
    • Itching
      • Itching can be a common problem. Itches can be localized or generalized. There are many causes of itching to include: infection (jock itch, vaginal itch), disease (hyperthyroidism, liver or kidney), reactions to drugs, and skin infestations (pubic or body lice). Treatment for itching varies depending on the cause of the itch.
    • Food Allergy
      • The most common food allergies are to eggs, nuts, milk, peanuts, fish, shellfish, strawberries and tomatoes. Symptoms and signs include nausea, vomiting, diarrhea, abdominal pain, itching, hives, eczema, asthma, lightheadedness, and anaphylaxis. Allergy skin tests, RAST, and ELISA tests may be used to diagnose a food allergy. Though dietary avoidance may be sufficient treatment for mild allergies, the use of an Epipen may be necessary for severe food allergies.
    • Allergy
      • An allergy refers to a misguided reaction by our immune system in response to bodily contact with certain foreign substances. When these allergens come in contact with the body, it causes the immune system to develop an allergic reaction in people who are allergic to it. It is estimated that 50 million North Americans are affected by allergic conditions. The parts of the body that are prone to react to allergies include the eyes, nose, lungs, skin, and stomach. Common allergic disorders include hay fever, asthma, allergic eyes, allergic eczema, hives, and allergic shock.
    • Dysphagia
      • Dysphagia or difficulty in swallowing, swallowing problems. Dysphagia is due to problems in nerve or muscle control. It is common, for example, after a stroke. Dysphagia compromises nutrition and hydration and may lead to aspiration pneumonia and dehydration.
    • Mercury Poisoning
      • Mercury is a naturally occurring element found in water, soil, and the air. Mercury is also contained in some fish, some of the products we use in the home, school, or dentist. Information about sources of mercury exposure, potential health effects, symptoms of exposure, fish that may contain mercury, consumer products that contain mercury, and ways to reduce your exposure to mercury is important for the health of you, and your family.
    • Spider Bites (Including Black Widow and Brown Recluse)
      • The majority of spiders in the United States are harmless. Two exceptions include the black widow spider and the brown recluse spider. Symptoms of a harmless spider bite generally involve redness, irritation, and pain. alized symptoms of bites from black widow and brown recluse spiders may include: nausea and vomiting, fever, headache, abdominal pain, joint pain, and more. In general, a brown recluse spider bite or black widow spider bite may require medical attention. The information includes pictures of the brown recluse and black widow spiders for identification.
    • Shock (Medical)
      • Medical shock is a life-threatening medical condition. There are several types of medical shock, septic shock, anaphylactic shock, cardiogenic shock, hypovolemic shock, and neurogenic shock. Causes of shock include heart attack, heart failure, heavy bleeding (internal and external), infection, anaphylaxis, spinal cord injury, severe burns, chronic vomiting or diarrhea. Low blood pressure is the key sign of sock. Treatment is dependant upon the type of shock.
    • Latex Allergy
      • Latex allergy is a condition where the body reacts to latex, a natural product derived from the rubber tree. The reaction can either be delayed and cause a skin rash or immediate, which can lead to anaphylaxis. Avoiding latex is the most effective way to prevent an allergic reaction.
    • Bee and Wasp Sting
      • Bees, wasps, and fire ants are related insects that belong to the Hymenoptera order. There are thousands of species of wasps found throughout the world. Common wasps are yellow jackets and hornets. Types of bees include honey bees, the Africanized honey bee (killer bee), and the bumble bee. There are four types of reactions to a bee or wasp sting; 1) local reaction, 2) systemic allergic reaction, 3) toxic reaction, and 4) delayed reaction. Individuals who have a systemic or toxic reaction generally require immediate medical treatment to prevent anaphylactic reaction, and possibly death.
    • Fitness
      • Regular physical activity can reduce the risk of disease. Regular exercise can also reduce the symptoms of stress and anxiety. There are fitness programs that fit any age or lifestyle.
    • Insect Sting Allergies
      • The majority of stinging insects in the United States are from Bees, Yellow Jackets, Hornets, Wasps and Fire Ants. Severity of reactions to stings varies greatly. Avoidance and prompt treatment are essential. In selected cases, allergy injection therapy is highly effective.
    • Bug Bites and Stings
      • Bug bites and stings have been known to transmit insect-borne illnesses such as West Nile virus, Rocky Mountain spotted fever, and Lyme disease. Though most reactions to insect bites and stings are mild, some reactions may be life-threatening. Preventing bug bites and stings with insect repellant, wearing the proper protective attire, and not wearing heavily scented perfumes when in grassy, wooded, and brushy areas is key.
    • Drug Allergies
      • Drug allergies are cause when the immune system mistakenly creates an immune response to a medication. Symptoms of a drug allergic reaction include hives, rash, itchy skin or eyes, dizziness, nausea, diarrhea, fainting and anxiety. The most common drug allergy is penicillin. Treatment may involve antihistamines or corticosteroids. An Epipen may be used for life-threatening anaphylactic symptoms.
    • Allergic Cascade
      • The allergic cascade refers to allergic reactions that happen in the body in response to allergens. A variety of immune cells and chemical messengers participate in the allergic cascade. Symptoms of the allergic cascade range from mild swelling and itching to full-blown anaphylactic shock. Allergen avoidance and medications are used to prevent or treat allergies.
    • First Aid
      • First aid is a complicated subject and it is situation-specific. First aid is the help and medical assistance that someone gives, not only to an injured person, but to a person who is sick. Preparedness is a key element of first aid, like having basic medical emergency kits in your home, car, boat, or RV. Cuts, puncture wounds, sprains, strains, nosebleeds are one type of injury that may require first aid; heart attacks, strokes, seizures, and heat stroke are examples of more critical first aid emergencies.
  • Medications

  • Procedures & Tests

  • Pictures, Images & Illustrations

  • Doctor's & Expert's Views

  • Health News

  • Health Features

Allergies & Asthma

Improve treatments & prevent attacks.



Symptom Checker: Your Guide to Symptoms & Signs: Pinpoint Your Pain



Anaphylaxis

Allergy facts

  • Allergy involves an exaggerated response of the immune system.
  • The immune system is the body's organized defense mechanism against foreign invaders, particularly infections.
  • Allergens are substances that are foreign to the body and can cause an allergic reaction.
  • IgE is the allergy antibody.
  • Allergies can develop at any age.
  • Your risk of developing allergies is related to your parents' allergy history.

Introduction

In this review you will learn how allergy relates to the immune system. You will begin understanding how and why certain people become allergic. The most common allergic diseases are discussed briefly in this article.

What does an allergy mean?

An allergy refers to an exaggerated reaction by our immune system in response to bodily contact with certain foreign substances. It is exaggerated because these f...

Read the Allergy article »




Use Pill Finder Find it Now

Pill Identifier on RxList

  • quick,
    easy,
    pill identification

Find a Local Pharmacy

  • including
    24 hour
    pharmacies