3 learning resources available for this topic
Schizophrenia is a chronic, severe mental disorder characterized by delusions, hallucinations, disorganized thinking, and abnormal motor behavior. It typically manifests in late adolescence or early adulthood and affects approximately 1% of the global population, significantly impairing social, occupational, and personal functioning.
The disorder involves dysregulation of neurotransmitter systems, particularly dopamine hyperactivity in mesolimbic pathways (positive symptoms) and hypoactivity in mesocortical pathways (negative symptoms). Structural brain abnormalities include enlarged ventricles, reduced gray matter volume, and altered connectivity between prefrontal cortex and limbic structures, with genetic factors contributing 60-80% of disease risk.
Diagnosis requires two or more psychotic symptoms (delusions, hallucinations, disorganized speech) for at least one month within a six-month period of functional decline, with medical and substance-induced causes excluded. Early intervention with antipsychotic medications targeting dopamine D2 receptors, combined with psychosocial rehabilitation, significantly improves long-term outcomes and prevents relapse.