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Delusions are fixed beliefs that do not change, even when a person is presented with conflicting evidence. Delusions are considered "bizarre" if they are clearly implausible and peers within…

A person who has experienced or witnessed a life-threatening, terrifying or otherwise deeply traumatic event may, in some cases, develop acute stress disorder (ASD), sometimes also called…

Colony collapse disorder (CCD), disorder affecting honeybee colonies that are characterized by sudden colony death, with a lack of healthy adult bees inside the hive. Although the cause is…

Dissociative identity disorder (DID) was formerly called multiple personality disorder. It is a mental illnesses that involves disruptions or breakdowns of memory, awareness, identity and/or…

An autoimmune disease is a condition in which your immune system mistakenly attacks your body. The immune system normally guards against germs like bacteria and viruses. When it senses…

Attention-deficit/hyperactivity disorder (ADHD) is a brain disorder marked by an ongoing pattern of inattention and/or hyperactivity-impulsivity that interferes with functioning or…

Illness anxiety disorder (previously called hypochondriasis, a term that has been abandoned because of its pejorative connotation) most commonly begins during early adulthood and appears to…

Impulse control disorders (ICDs) are common psychiatric conditions in which affected individuals typically report significant impairment in social and occupational functioning, and may incur…

Psychotic disorders are severe mental disorders that cause abnormal thinking and perceptions. People with psychoses lose touch with reality. Two of the main symptoms are delusions and…

The autonomic nervous system (ANS) controls several basic functions, including: heart rate body temperature breathing rate digestion sensation You don’t have to think consciously…