NAMI HelpLine

Schizoaffective Disorder

Schizoaffective disorder is a serious mental health condition characterized primarily by symptoms of schizophrenia, such as hallucinations or delusions, along with symptoms of a mood disorder, such as mania and depression.

Many people with schizoaffective disorder are often incorrectly diagnosed at first with either bipolar disorder or schizophrenia. Because schizoaffective disorder is less well-studied than the other two conditions, many of the interventions used actually were developed for those treatment approaches — but have demonstrated effectiveness in schizoaffective disorder.

Schizoaffective disorder is relatively rare, with a lifetime prevalence of 0.3%. Men and women experience schizoaffective disorder at the same rate, but men often develop the illness at an earlier age. Schizoaffective disorder can be managed effectively with a combination of medication and therapy. It’s common for people with this condition to also experience substance use disorders which require an integrated treatment.

Causes

The exact cause of schizoaffective disorder is unknown. A combination of causes may contribute to its development, a few of which include:

  • Genetics. Schizoaffective disorder tends to run in families. This does not mean that if a relative has an illness, you will absolutely get it. But it does mean that there is a greater chance of you developing the illness. Additionally, studies have found that people who have a family history of schizophrenia or mood disorders are at increased risk for developing schizoaffective disorder. It’s important to be aware that most people with these family histories do not develop these conditions.
  • Brain chemistry and structure. Brain structure and function may differ in ways that science is only beginning to understand. Advances in brain-imaging research are helping us gain a clearer picture of these differences and fortunately are not necessary to develop an effective treatment plan.
  • Stress. Stressful events such as a death in the family, end of a marriage or loss of a job can contribute to the development of symptoms or an onset of the illness.
  • Drug use. Substance use can increase the risk of developing or worsening symptoms of schizoaffective disorder, particularly in people who are already vulnerable.
    • Hallucinogenic drugs such as LSD or psilocybin (“mushrooms”) can sometimes trigger psychotic episodes that resemble those seen in schizoaffective disorder. Regular marijuana use during adolescence has also been linked to a higher risk of developing psychotic disorders later in life, especially among individuals with a family history or genetic predisposition.
    • Stimulant drugs — including cocaine, amphetamines, and methamphetamine — can also cause or worsen psychotic symptoms. In some cases, stimulant use may lead to temporary psychosis, and in others it may increase the likelihood of developing a longer-term psychotic disorder in those who are already at risk.

Related Conditions

A person with schizoaffective disorder may have additional mental health conditions. Each of these co-occurring conditions requires thoughtful additions to the treatment plan

 

Reviewed and updated December 2025

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text “NAMI” to 62640, or email. In a crisis, call or text 988 (24/7).