Psychosis

A severe mental disorder in which the individual loses contact with reality. Three main categories of psychosis are recognized: schizophrenia, manic–depressive illness, and organic brain syndrome (see brain syndrome, organic). The main feature of psychotic illnesses is that they cause a person to have a distorted view of life. Symptoms include delusions, hallucinations, thought disorders, loss of affect, mania, and depression. The cause is most likely to be a disorder of brain function. Antipsychotic drugs are usually effective in controlling symptoms. Long-term treatment, rehabilitation, and support are often needed.