It is not known what causes ADHD. It may be caused
by a problem in how the brain works. ADHD may run in families. Studies have been
done and it is a disorder of the central nervous system that can be
inherited.

People who have ADHD find it hard to sit still and
pay attention. Often they blurt out answers and are easily distracted. They fail
to finish tasks and they often interrupt others. They may have trouble following
directions and may not be able to stay with an activity for very long. To
find out if your child has ADHD, you have to fill out forms called rating scale
forms and that will help your doctor see how often the ADHD behaviors happen.