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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 rather than a medical condition-it is not itself a psychiatric diagnosis, but a sign of a mental disorder. Psychotic symptoms may be separated out and given specific descriptions.t a general level, two types of psychiatric disorder produce psychosis: schizophrenia, and mood or affective disorder. Specific diagnoses and subtypes can display psychotic symptoms, and there is also some overlap.