one of the most common reasons that children are referred for mental health services in the united states is adhd. autism. pervasive developmental disorder. stuttering.

ADHD

Explanation:

             The full form of ADHD is "attention deficit hyperactivity disorder". It is a mental disorder in which children finds it difficult to pay attention to anything surrounding them.

            A person suffering form  ADHD has differences in brain activities and brain development which affects the person to pay attention, or sitting still and the ability to self control.

            It is chronic condition which includes impulsiveness and hyperactivity. The person is always in restless condition. ADHD can begin in childhood but it can last till adulthood.  

           Most of the children suffering from the attention deficit hyperactivity disorder or ADHD are referred to mental health services in the U.S.

Hence the answer is ---

ADHD

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