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Symptoms of Schizophrenia

Rashmi Nemade, Ph.D. & Mark Dombeck, Ph.D., edited by Kathryn Patricelli, MA


To be diagnosed with Schizophrenia, a person must have 2 or more of the following symptoms for a significant part of the time during a 1-month or longer period:

  • Delusions - fixed, mistaken ideas that the person holds. These are often odd or incorrect ideas about themselves and the world around them.
  • Hallucinations - sensations that only the person experiences. This can include voices speaking to them that only they can hear.
  • Disorganized Speech - this can be switching topics frequently while talking, giving answers to questions that weren't asked or not being understandable by others.
  • Very Disorganized or Catatonic Behavior - this might be childlike "silliness" or being agitated or irritated without a reason, or showing no reactions to the world around them.
  • Negative Symptoms - this might be not having the full range of emotional expression that others do, having poor eye contract and little body movement; or not showing interest in participating in activities.

Additional criteria include:

  • the person's level of functioning in terms of self-care, work, or relationships must show significant decline compared to before the symptoms were present.
  • there must be continuous signs of disturbance for at least 6 months. This may include 1-month of active symptoms and then periods of lower symptoms where only negative symptoms are present.
  • symptoms must not be part of Schizoaffective disorder or bipolar disorder or major depressive disorder with psychotic features.
  • symptoms must not be the result of another medical condition or a substance/medication that was taken.
  • If there is a history of autism spectrum disorder or a communication disorder, the diagnosis of schizophrenia can be made only if delusions or hallucinations are present, along with the other required symptoms of schizophrenia for at least 1 month.

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Sarah Dinklage, LICSW
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Charles Cudworth, MA
Director, SAS

Leigh Reposa, MSW, LICSW
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Colleen Judge, LMHC                  Manager, SAS 

Kathleen Sullivan
Manager, Community Prevention

300 Centerville Rd.
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