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Key Fact
Over 60% of individuals with Williams syndrome will show characteristics associated with Attention Deficit Hyperactive Disorder (ADHD)

Overactivity and Impulsivity in Williams syndrome

Overactivity and impulsivity (tendency to display behaviour without planning or consideration of the consequences) are commonly reported features in Williams syndrome. Of all the different mental health problems, Attention Deficit Hyperactive Disorder (ADHD) tends to affect the highest number of individuals (over 60%) with Williams syndrome.


ADHD is characterised by persistent inattention and hyperactivity and is also a common disorder of childhood in the general population. Children or adults with ADHD may find it difficult to stay focused and this can be problematic for learning, particularly at school.


In Williams syndrome, the most prevalent subtype of ADHD is related to inattention (approximately 70% of people with Williams syndrome with ADHD), followed by around 27% with the Combined type (inattention plus hyperactivity-impulsivity), and 4% with the Predominantly Hyperactive-Impulsive type.

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