Schizophrenia is a severe brain disorder that causes abnormal interpretations of reality, characterized by hallucinations, delusions, and disordered thinking. Some key factors that may contribute include genetics and viral infections during pregnancy. Common delusions include feelings of being harassed or plotted against, while hallucinations often involve hearing voices. Treatment involves antipsychotic medications and therapy, and many people with schizophrenia can live normal lives by adhering to their treatment plans.