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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.
People who have certain personality disorders or who have schizophrenia, bipolar disorder or severe depression may also experience psychosis. The symptoms of psychosis could lessen with treatment for the mental health condition. The use of certain drugs may cause psychotic episodes.