Attention Deficit Hyperactivity Disorder (ADHD) is a condition that becomes apparent in some children in the preschool and early school years. It is hard for these children to control their behavior and/or pay attention. The principal characteristics of ADHD are inattention, hyperactivity, and impulsivity. Because many normal children may have these symptoms, but at a low level, or the symptoms may be caused by another disorder, it is important that the child receive a thorough examination and appropriate diagnosis by a well-qualified professional. ADHD responds well to medications, behavioral therapy for the child, and/or special parenting techniques.