What is the commonest cause of mental retardation or intellectual disability?

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What are the commonest cause of mental retardations among the people we see around. Some look normal and some abnormal in appearance.

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Down Syndrome is the commonest cause of Mental Retardation. 2nd most
Commonest genetic cause is Fragile X syndrome.

answered Jun 9, 2014 by admin Doctor of Medicine (9,909 points)