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Schizophrenia: Related Disorders - Topic Overview

A few disorders have some of the same symptoms as schizophrenia (schizophrenia spectrum disorders), including:

  • Schizotypal personality disorder. A person with schizotypal personality disorder has a difficult time developing close relationships with other people and may hold beliefs not shared by other people in his or her same culture. The person may also have unusual behaviors and learning difficulties.
  • Schizoid personality disorder. A person with schizoid personality disorder is aloof from other people and does not show many emotions.
  • Delusional disorder. People with delusional disorder believe things that could happen but are unlikely to happen. For example, a person with delusional disorder may believe he or she has cancer despite several negative test results. The person has no other psychotic symptoms, except those related to the delusion. But he or she is able to function in daily life.
  • Schizoaffective disorder. People with schizoaffective disorder have the same symptoms as people with schizophrenia. But they also have episodes of depression and times when they feel extremely happy or have lots of energy (mania). For more information, see the topics Depression and Bipolar Disorder.
  • Schizophreniform disorder. People with schizophreniform disorder have the same symptoms as people with schizophrenia. But their illness episodes do not last as long (from 1 to 6 months), and they may not have as many problems getting along with other people.

    This information is produced and provided by the National Cancer Institute (NCI). The information in this topic may have changed since it was written. For the most current information, contact the National Cancer Institute via the Internet web site at http:// cancer .gov or call 1-800-4-CANCER.

    WebMD Medical Reference from Healthwise

    Last Updated: November 14, 2014
    This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
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