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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 has many causes. Schizophrenia and other psychiatrics disorders are the most common cause of psychosis. Substance abuse, brain tumors, dementia, Parkinson's and stroke are other possible causes of psychosis.sychosis has many causes. Schizophrenia and other psychiatrics disorders are the most common cause of psychosis. Substance abuse, brain tumors, dementia, Parkinson's and stroke are other possible causes of psychosis.