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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.
However, neurosis is not as severe as psychosis. Psychosis, or a psychotic disorder, is believed to be more of a symptom than a diagnosis. As a psychiatric term, psychosis refers to any mental state that impairs thought, perception, and judgment.Psychotic episodes might affect a person with or without a mental disease.hough neurotic and psychotic are both relative to mental health, there are differences between neurotic and psychotic conditions. The terms neurosis and psychosis are sometimes used interchangeably with neurotic and psychotic disorders.