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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.
It is often associated with mental health disorders like depression, bipolar disorder, and schizophrenia. However, psychosis can also occur for many other reasons, including substance abuse, brain injury, seizure disorders, or conditions of extreme sleep deprivation or isolation.