ADHD, or Attention Deficit Hyperactivity Disorder, is a common developmental disorder, not a learning disability. If your child has ADHD, he can be impulsive, easily distracted, and have trouble finishing tasks. Yet, many kids with ADHD have average intelligence. And some may have high IQs. Some kids with ADHD may have learning disabilities; about half do. If you are concerned, have your child checked for this.