Attention deficit hyperactivity disorder (ADHD) is a type of disorder normally found in children under twelve years of age. It can also be called as hyperactivity and impulsiveness, there are three types of ADHD, predominantly inattentive (ADHD-PI or ADHD-I), predominantly hyperactive-impulsive (ADHD-HI or ADHD-H), or the two combined (ADHD-C). There are different types of symptoms according to the disorder.
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Attention deficit hyperactivity disorder (ADHD) is a type of disorder normally found in children under twelve years of age. It can also be called as hyperactivity and impulsiveness, there are three types of ADHD, predominantly inattentive (ADHD-PI or ADHD-I), predominantly hyperactive-impulsive (ADHD-HI or ADHD-H), or the two combined (ADHD-C). There are different types of symptoms according to the disorder.
To know more about it :- http://en.wikipedia.org/wiki/Attention_deficit_hyperactivity_disorder