Schizophrenia is a severe brain disease. It is found all over the world. "Approximately one percent of the population develops schizophrenia during their lifetime - more than two million Americans suffer from the illness in a given year." (http://www.medicinenet.com/schizophrenia/article.htm). Schizophrenia is often thought of as a split personality, but that is not what it is at all.
Schizophrenia is similar to other mental disorders. It is hard to tell one from another because the symptoms of schizophrenia are similar to those of depression. Someone might have the manic-depressive disorder, or the bipolar disorder, or a major depressive disorder, or they could have schizophrenia and its very difficult to tell. However, some of the symptoms are depression, confusing or shocking changes in behavior, hallucinations/illusions, delusions, or disordered thinking. People with Schizophrenia may believe that someone is trying to kill them, or someone is reading their mind or controlling what they are thinking, or they may hear voices.
Hallucinations may be the voices a patient suffering with schizophrenia hears. The voices in their head could be carrying on a conversation, or telling the patient what to do. Illusions are when the patient thinks they see something happening that really isn't. Delusions are beliefs or impressions that are not real such as the belief that someone is plotting to kill them or control what they are thinking or how they behave. A patient may believe that they, or a member of their family, or someone close to them are in danger. Disordered thinking is how schizophrenia can cause people to have a hard time thinking straight. The patient may not be able to concentrate or think about a certain thing for a long time because they have a short attention span and are distracted very easily.
I think schizophrenia is...