Schizophrenia is a mental disorder that is quite common, with more than three million reported cases in the US yearly. It is characterized by delusions, disorganized speech, behavior, and hallucinations. It is more frequent in males than females and usually presents for ages 18 through 35. If you have a family history of this illness, it may increase your likelihood of having this illness, and the actual cause is not known, abnormal function of neurotransmitters such as dopamine can cause this.
Schizoaffective disorder is like schizophrenia with a mood disorder added to the mix, and there are 200,000 cases reported yearly in the US. The symptoms include Delusions and visual or auditory hallucinations, depression, mania, and disorganized thinking. The exact cause is unknown; however, genetics come into play along with brain chemistry changes. This illness can be brought about by stress or traumatic events.