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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, or a psychotic disorder, is believed to be more of a symptom than a diagnosis. As a psychiatric term, psychosis refers to any mental state that impairs thought, perception, and judgment. Psychotic episodes might affect a person with or without a mental disease.