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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.
ICU psychosis: A disorder in which patients in an intensive care unit (ICU) or a similar hospital setting may experience anxiety, become paranoid, hear voices, see things that are not there, become severely disoriented in time and place, become very agitated, even violent, etc.