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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.
Updated March 15, 2017. Psychosis is a loss of contact with reality, typically including delusions (false ideas about what is taking place or who you are) and hallucinations (seeing or hearing things that aren't there). About 3 in every 100 people experience psychosis at some time in their lives.