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undifferentiated schizophrenia

mental disorder
Also known as: simple schizophrenia

Quick Summary

Undifferentiated schizophrenia is a subtype of schizophrenia, a severe mental disorder characterized by hallucinations, delusions, blunted emotions, disordered thinking, and withdrawal from reality. This subtype typically presents with a gradual reduction in external interests and emotional depth. Patients may exhibit simplified thinking, a lack of mental activity, and a retreat into stereotyped behaviors.12

While previously a distinct diagnostic category, the subtypes of schizophrenia, including undifferentiated, are now often viewed as overlapping symptom presentations rather than separate conditions. Schizophrenia affects approximately 0.33–0.75 percent of the global population and is a leading cause of mental hospital admissions. The exact cause is unknown, but a combination of genetic and environmental factors is believed to play a role.12

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