Schizophrenia is a serious mental disorder affecting how individuals think, feel, and behave, with a prevalence of approximately 1% in the general population. Its causes include genetic factors, brain chemical imbalances, environmental influences, and family history, while symptoms are categorized into positive, negative, and cognitive groups. Diagnosis requires the presence of multiple symptoms lasting at least six months, and treatment options include institutional care, antipsychotic medications, and psychotherapy.