Search Health Information Attention deficit hyperactivity
disorder (ADHD)Definition: ADHD is a problem with
inattentiveness, over-activity, impulsivity, or a combination.
For these problems to be diagnosed as ADHD, they must be out of
the normal range for a child's age and development. ADD; ADHD;
Childhood hyperkinesis Causes, incidence, and risk factors:
Imaging studies suggest that the brains of children with ADHD
are different from those of other children. These children
handle neurotransmitters (including dopamine, serotonin, and
adrenaline) differently from their peers. ADHD may run in
families, but it is not clear exactly what causes it. Whatever
the cause may be, it seems to be set in motion early in life as
the brain is developing. Depression, lack of sleep, learning
disabilities, tic disorders, and behavior problems may be
confused with, or appear with, ADHD. Every child suspected of
having ADHD should have a careful evaluation to determine what
is contributing to the behaviors that are causing conce