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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 characterized by an impaired relationship with reality. And it is a symptom of serious mental disorders. People who are psychotic may have either hallucinations or delusions. Hallucinations are sensory experiences that occur within the absence of an actual stimulus.