This chapter describes two quite different types of excessive movement that may occur in a child with ADHD, although it is important to note that many children with ADHD are not overactive. The first type is the hyperactivity, also called overactivity, that occurs as part of the condition in some, but by no means all, children with the disorder. The second type of excessive movement is a tic disorder. By definition, a tic disorder is a type of sudden, repetitive movement (motor tic) or vocalization (vocal tic). Both of these types of tics are more common in children with ADHD.
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