The document defines psychosis as a loss of contact with reality and discusses its causes, types, signs and symptoms, diagnosis, treatment, and nursing management. Psychosis can be caused by genetic and medical factors as well as substance use and can involve hallucinations, delusions, and thought disorders. Diagnosis involves medical testing and evaluations to determine if underlying medical or substance conditions are present. Treatment includes antipsychotic medications, therapy, and rehabilitation services. Nursing care focuses on safety, communication, maintaining health, and addressing low self-esteem.