Attention deficit-hyperactivity disorder (ADHD) is a neurobehavioral disorder. It interferes with a person’s ability to stay on a task and to exercise age-appropriate inhibition (cognitive alone or both cognitive and behavioral).

Some of the warning signs of ADHD include failure to listen to instructions, inability to organize oneself and school work, fidgeting with hands and feet, talking too much, leaving projects, chores and homework unfinished, and having trouble paying attention to and responding to details.

There are several types of ADHD: a predominantly inattentive subtype, a predominantly hyperactive-impulsive subtype, and a combined subtype.