Schizophrenia is a chronic, severe mental disorder that affects how a person thinks, feels, and behaves.
The symptoms of schizophrenia can be grouped into positive (excess or distortion) and negative (depletion or loss).
Positive symptoms include delusions, hallucinations, disorganized speech, grossly disorganized or catatonic behavior, and agitation.
Negative symptoms include flataffect, alogia, avolition, anhedonia, asociality, and attentiondeficit.
There is no single cause of schizophrenia, but it is believed to result from the interaction between genetic vulnerability and environmental factors.
Risk factors for developing schizophrenia include genetics, brain chemistry imbalances, prenatal complications, drug use during pregnancy, viral infection during pregnancy, and stressful life events.