Diagnostic behavioral phenotype Schizophrenia 2011-06-07T09:53:08Z A mental disorder characterized by a disintegration of thought processes and emotional responsiveness. It most commonly manifests as auditory hallucinations, paranoid or bizarre delusions, or disorganized speech and thinking. It is accompanied by significant social or occupational dysfunction. The onset of symptoms typically occurs in young adulthood, with a global lifetime prevalence of about 1%. This term is not a helpful parent term to describe abnormal experiences. HP:0100753 SNOMEDCT_US:58214004 UMLS:C0036341 SNOMEDCT_US:191526005 Positive symptoms, such as delusions and hallucinations (especially of voices), are common, and any Schneiderian first-rank symptoms are particularly indicative of the illness. Negative symptoms include social withdrawal, impairment of ego boundaries, and loss of energy and initiative. Schizophrenia is diagnosed only if symptoms persist for at least one month. The illness can spontaneously remit, run a course with infrequent or frequent relapses, or become chronic. The prognosis has improved with antipsychotic drugs and with vigorous psychological and social management and rehabilitation. The many causes include genetic factors, environmental stress, and various triggering factors.