Schizophrenia is a disease of the brain that is often persistent, severe, and disabling. Approximately 1.1% of the population age 18 and older in the United States, roughly 2.4 million people, suffer from schizophrenia. The disease is characterized by serious and at times extreme disruptions in perception, thought and emotion. Individuals with schizophrenia often experience hallucinations, delusions, an inability to think clearly or rationally, and a marked lack of emotional response. Some of the more serious symptoms of schizophrenia can be controlled with medication in many patients.