One of the more common mental health issues that affects people with intellectual disabilities is oppositional defiant disorder obsessive-compulsive disorder anxiety disorder violent disorder

One of the more common mental health issues that affects people with intellectual disabilities is Obsessive compulsive disorder.

Explanation:  

"Obsessive compulsive disorder" is very common with people and known to occur popularly in intellectual disable people. There is "lack of communication" with these kind of patient and this in turn makes the child move towards an obsessiveness in nature making it extremely difficult to diagnose especially in young children. It is growing in population and very common in developmental disability. They are common in "behavioural phenotypes", the first symptoms to notice are behavioural change.

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