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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.
Neurotic disorders. Neurosis refers to a class of functional mental disorder involving distress but not delusions or hallucinations, where behavior is not outside socially acceptable norms.It is also known as psychoneurosis or neurotic disorder.eurosis refers to a class of functional mental disorder involving distress but not delusions or hallucinations, where behavior is not outside socially acceptable norms.