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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.
Not to be confused with psychosis. Neurosis is a class of functional mental disorders involving distress but neither delusions nor hallucinations. Neurosis should not be mistaken for psychosis, which refers to a loss of touch with reality. Neither should it be mistaken for neuroticism, which is a fundamental personality trait according to psychological theory. 1 Symptoms and causes.