Both disorders share certain symptoms and treatments. Schizoaffective disorder has a mood element (such as mania/depression) in addition to psychosis, while patients with schizophrenia only show psychosis symptoms. Some scientists believe that schizoaffective disorder is a more intense version of schizophrenia. Commonly shared symptoms between these two disorders are hallucinations (hearing/seeing things that are not real) and delusions (believing incorrect values despite evidence to prove otherwise). 

University of Illinois at Chicago

Do these findings have any consequences for the nosological status of schizoaffective disorder? These findings are not compatible with the thought that schizoaffective disorder is a variation of bipolar disorder. There is a proposal that states how schizoaffective disorder is classified as a sort of "midpoint along a continuum of psychosis" (genetically/clinically). The findings from this study are most congenial with schizoaffective disorder being a variation of schizophrenia. Another possible theory of schizoaffective disorder is that it's an intermediate form of illness that directs towards schizophrenia. 

Nosological implications

Fletcher, Jenna. (2023, February 9). What are the similarities and differences between schizoaffective disorder and schizophrenia? Medical News Today. https://www.medicalnewstoday.com/articles/schizoaffective-vs-schizophrenia

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