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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.
Plural psychoses (sÄ«-kÅâ²sÄz) A mental illness so severe that a person loses the ability to think logically, to communicate, and to relate to others. A person with a psychosis loses contact with reality and often shows dramatic changes in behavior. Psychoses can be caused by diseases affecting the brain.