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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.
Although real to the person experiencing psychosis, psychotic experiences are not experienced as real to others. In fact, as a medical term, psychosis refers to a loss of contact with reality, or difficulty telling what is real from what is not real. Psychosis is more common than many people think.