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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 serious mental disorder characterized by thinking and emotions that are so impaired, that they indicate that the person experiencing them has lost contact with reality.People who are psychotic have false thoughts (delusions) and/or see or hear things that are not there (hallucinations).sychosis is a serious mental disorder characterized by thinking and emotions that are so impaired, that they indicate that the person experiencing them has lost contact with reality.