Schizophrenia is a serious mental disorder in which people interpret reality abnormally schizophrenia may result in some combination of hallucinations delusions and extremely disordered thinking and behavior that impairs daily functioning and can be disabling people with schizophrenia require lifelong treatment. Schizophrenia is a chronic severe mental disorder that affects the way a person thinks acts expresses emotions perceives reality and relates to others though schizophrenia isnt as common