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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 is a set of symptoms that involve a personâs mind âplaying tricks on him or her.â The person experiencing psychosis may have difficulty telling the difference between his or her own thoughts and perceptions and those that come from the outside world.