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Home > Health A â Z > Psychosis. A severe mental disorder in which a person loses the ability to recognize reality or relate to others. Symptoms include being paranoid, having false ideas about what is taking place or who one is, and seeing, hearing, or feeling things that are not there. PubMed Health Glossary.
Psychosis is a symptom, not an illness. A diagnosis identifies an illness, and symptoms are components of an illness. Health care providers draw on information from medical and family history along with a physical examination to make a diagnosis.ymptoms of a psychotic episode can include incoherent speech and disorganized behavior, such as unpredictable anger, but psychosis typically involves one of two major experiences: Hallucinations are seeing, hearing or physically feeling things that arenât actually there. For example: