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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.
neurosis. 1. former name for a category of mental disorders characterized by anxiety and avoidance behavior, with symptoms distressing to the patient, intact reality testing, no violations of gross social norms, and no apparent organic etiology.omatic conditions may be factors in the cause and may be symptoms in a neurosis; however, the use of the term to describe a dysfunction of the nervous system is obsolete. Also called.