A delusion is a false personal belief that is not subject to reason or contradictory evidence and is not explained by a person's usual cultural and religious concepts (so that, for example, it is not an article of faith). A delusion may be firmly maintained in the face of incontrovertible evidence that it is false. Delusions are common in psychotic disorders such as schizophrenia. Delusions can also be a feature of brain damage or disorders. Delusions can be accompanied by other psychiatric symptoms or by physical symptoms when these occur related to a medical condition. Delusional disorder is a specific psychiatric condition that was formerly known as paranoid disorder. Examples of delusions include the sufferer believing that one has an unusual power or talent, believing that someone else (possibly a prominent figure or famous person) is in love with them, believing that one is being persecuted, or believing that one has a nonexistent medical problem.
Other causes of delusions
- Brain Trauma
- Delusional Disorder
- Drug-Induced Psychosis
Pictures, Images, Illustrations & Quizzes
Alzheimer's Disease Symptoms & Early Diagnosis
Learn the early warning signs and symptoms of Alzheimer's disease. Memory loss and confusion can be signs of normal aging, but...
Alzheimers Disease Quiz: Stages, Symptoms & Signs
Take the Alzheimer's Quiz to discover some of the mysteries behind this cognitive disorder. Learn causes, symptoms, treatments,...
Schizophrenia Quiz: What is Schizophrenia?
Schizophrenia is a complex psychiatric disorder. Learn more about the challenges of mental illness with the Schizophrenia Quiz.
Schizophrenia: Symptoms, Types, Causes, Treatment
What is schizophrenia? Learn about schizophrenia symptoms, signs, and treatment. Read about schizophrenia types such as paranoid...
Causes of Delusions
Alcoholism is a disease that includes alcohol craving and continued drinking despite repeated alcohol-related problems, such as losing a job or getting into trouble with the law. It can cause myriad health problems, including cirrhosis of the liver, birth defects, heart disease, stroke, psychological problems, and dementia. Counseling and a few medications can be effective for alcoholism treatment.
Alzheimer's disease is a common cause of dementia. Symptoms and warning signs of Alzheimer's disease include memory loss, difficulty performing familiar tasks, disorientation to time and place, misplacing things, and more. The biggest risk factor for Alzheimer's disease is increased age. Treatment for Alzheimer's is often targeted toward decreasing the symptoms and progression of the disease.
Bipolar disorder (or manic depression) is a mental illness characterized by depression, mania, and severe mood swings. Treatment may incorporate mood-stabilizer medications, antidepressants, and psychotherapy.
Brain and Spinal Cord Tumors in Adults (Symptoms, Signs, Causes, Treatment Options, Life Expectancy)
Brain and spinal tumor are diseases in which cancer (malignant) cells begin to grow in the tissues of the brain. Tumors that start in the brain are called primary brain tumors. Tumors that start in the brain and spread to other organs are called primary brain tumors. Symptoms may include headaches, personality changes, dizziness, and trouble walking. Treatment depends upon the type and grade of tumor.
Brain Tumor: Warning Symptoms, Types, Causes, Treatments, and Cure
A brain tumor can be either non-cancerous (benign) or cancerous (malignant), primary, or secondary. Common symptoms of a primary brain tumor are headaches, seizures, memory problems, personality changes, and nausea and vomiting. Causes and risk factors include age, gender, family history, and exposure to chemicals. Treatment is depends upon the tumor type, grade, and location.
Dementia is defined as a significant loss of intellectual abilities such as memory capacity, severe enough to interfere with social or occupational functioning. There are several different types of dementia, including cortical, subcortical, progressive, primary, and secondary dementias. Other conditions and medication reactions can also cause dementia. Dementia is diagnosed based on a certain set of criteria. Treatment for dementia is generally focused on the symptoms of the disease.
Depression is an illness that involves the body, mood, and thoughts and affects the way a person eats and sleeps, the way one feels about oneself, and the way one thinks about things. The principal types of depression are major depression, dysthymia, and bipolar disease (also called manic-depressive disease).
Drug addiction is a chronic disease that causes drug-seeking behavior and drug use despite negative consequences to the user and those around him. Though the initial decision to use drugs is voluntary, changes in the brain caused by repeated drug abuse can affect a person's self-control and ability to make the right decisions and increase the urge to take drugs. Drug abuse and addiction are preventable.
Flakka (also known as "bath salts" or a number of other slang names) is a dangerous synthetic or "designer" drug. Users take it to experience euphoria, but it can often lead to dangerous delusions, paranoia, and bizarre behaviors. Dehydration, hyperthermia, and a dangerous condition that affects the kidneys called rhabdomyolysis can occur as a result of using Flakka.
Human Immunodeficiency Virus (HIV)
HIV (human immunodeficiency virus) infection left untreated causes AIDS (acquired immunodeficiency syndrome). Still incurable, AIDS describes immune system collapse that opens the way for opportunistic infections and cancers to kill the patient. Early symptoms and signs of HIV infection include flu-like symptoms and fungal infections, but some people may not show any symptoms for years. Highly active antiretroviral therapy (ART) is the standard treatment for HIV infection. These combination drug regimens have made HIV much less deadly, but a cure or vaccine for the pandemic remains out of reach. HIV is usually transmitted through sexual contact or sharing IV drug needles, but can also infect someone through contact with infected blood. Sexual abstinence, safe sex practices, quitting IV drugs (or at least using clean needles), and proper safety equipment by clinicians and first responders can drastically reduce transmission rates for HIV/AIDS.
Huntington's disease is the result of degeneration of neurons in areas of the brain. Huntington's disease is an inherited disorder. Early symptoms include mood swings, apathy, depression, and anger uncharacteristic of the individual. Judgement, memory, and other cognitive functions may become impaired. Presymptomatic testing is available for individuals who have a family history of Huntington's disease. Treatment includes medication and therapy for symptoms.
Lewy Body Dementia (Dementia with Lewy Bodies)
Lewy body dementia (LBD or dementia with Lewy bodies) is one the most common causes of dementia. There are two types of LBD: 1) dementia with Lewy bodies, and 2) Parkinson's disease dementia. Symptoms of LBD are changes in a person's ability to think, movement problems, and sleep disorders. Treatment of LBD includes lifestyle changes, management of symptoms, palliative care, and medications to manage symptoms.
Parkinson's disease is a slowly progressive neurological disease characterized by a fixed inexpressive face, a tremor at rest, slowing of voluntary movements, a gait with short accelerating steps, peculiar posture and muscle weakness, caused by degeneration of an area of the brain called the basal ganglia, and by low production of the neurotransmitter dopamine. Most patients are over 50, but at least 10 percent are under 40.
Postpartum depression is a form of depression that occurs within a year after delivery. It is thought that rapid hormone changes after childbirth may lead to depression. Symptoms of postpartum depression include crying a lot, headaches, chest pains, eating too little or too much, sleeping too little or too much, withdrawal from friends and family, and feeling irritable, sad, hopeless, worthless, guilty, and overwhelmed. Treatment typically involves talk therapy and medication.
Psychotic disorders are a group of serious illnesses that affect the mind. Different types of psychotic disorders include schizophrenia, schizoaffective disorder, schizophreniform disorder, brief psychotic disorder, shared psychotic disorder, delusional disorder, substance-induced psychotic disorder, paraphrenia, and psychotic disorders due to medical conditions.
Schizoaffective disorder is a mental illness that features schizophrenia and a mood disorder, either major depression or bipolar disorder. Symptoms include agitation, suicidal thoughts, little need for sleep, delusions, hallucinations, and poor motivation. Treatment may involve psychotherapy, medication, skills training, or hospitalization.
Schizophrenia is a disabling brain disorder that may cause hallucinations and delusions and affect a person's ability to communicate and pay attention. Symptoms of psychosis appear in men in their late teens and early 20s and in women in their mid-20s to early 30s. With treatment involving the use of antipsychotic medications and psychosocial treatment, schizophrenia patients can lead rewarding and meaningful lives.
Schizotypal Personality Disorder
Schizotypal personality disorder is characterized by odd behaviors, feelings, perceptions, and ways of relating to others that interfere with one's ability to function. Medication and psychotherapy can help the sufferer to manage their symptoms.
Anabolic steroids are synthetic substances that are related to testosterone and promote skeletal muscle growth and the development of male sexual characteristics in both men and women. In the 1930s, it was discovered that anabolic steroids could promote skeletal muscle growth in lab animals, which lead to anabolic steroid abuse by bodybuilders and weight lifters.
A stroke is an interruption of the blood supply to part of the brain caused by either a blood clot (ischemic) or bleeding (hemorrhagic). Symptoms of a stroke may include: weakness, numbness, double vision or vision loss, confusion, vertigo, difficulty speaking or understanding speech. A physical exam, imaging tests, neurological exam, and blood tests may be used to diagnose a stroke. Treatment may include administration of clot-busting drugs, supportive care, and in some instances, neurosurgery. The risk of stroke can be reduced by controlling high blood pressure, high cholesterol, diabetes, and stopping smoking.
Examples of Medications for Delusions
- aripiprazole (Abilify, Aristrada)
- chlorpromazine - oral, Thorazine
- chlorpromazine-injection, Thorazine
- clozapine (Clozaril, Fazacio ODT, Versacloz)
- fluphenazine (Permitil, Prolixin)
- fluphenazine concentrate - oral, Prolixin
- fluphenazine liquid - oral, Prolixin
- haloperidol (Haldol)
- olanzapine (Zyprexa, Zydis)
- quetiapine (Seroquel)
- risperidone, Risperdal; Risperdal Consta, Risperdal M-TAB
- thiothixene - oral, Navane
- ziprasidone (Geodon)
Subscribe to MedicineNet's General Health Newsletter