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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 symptom--poor reality testing, hallucinations, delusions, etc. One of the disorders for which it is a symptom is schizophrenia, but there are other possible causes of psychosis ranging from toxins, metabolic disturbances, severe depression and mania. In brief: Symptom vs disorder. Psychosis is a symptom--poor reality testing, hallucinations, delusions, etc.