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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.
â¢ Psychosis is a collection of symptoms that occur together over a period of time. The most prominent symptoms of psychosis are delusions and hallucinations where a person loses touch with reality, and has trouble telling the difference between what is real and what is not. Psychosis can affect the way a person thinks, feels and behaves (see Table 1).