Schizophrenia
There are no medical tests that can be used to say if a person has schizophrenia or not, so getting a diagnosis depends on which list of symptoms are used. It also depends on the doctor or psychologist who talks to the person. Some scientists think that schizophrenia is several separate illnesses that have some of the same symptoms. These scientists claim that the research done on schizophrenia is not accurate since different researchers mean different things when they use the word "schizophrenia" in scientific studies. Similarly named mental illnesses include schizotypal personality disorder, schizoaffective disorder, and schizoid personality disorder.