Co-Occurring Conditions

Data from the National Core Indicators and other research suggest that about one in three people with intellectual and/or developmental disabilities has a mental illness diagnosis requiring ongoing treatment and support. Mental health problems experienced by people with I/DD are the same as those in the general population but the signs and symptoms may vary due to an individual’s intellectual abilities, communication skills and social situation. Common psychiatric disorders include mood, anxiety, psychotic, adjustment, and personality.

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