Attention deficit hyperactivity disorder Attention deficit
hyperactivity disorder (ADHD) is a problem of not being able to
focus, being overactive, not being able control behavior, or a
combination of these. For these problems to be diagnosed as
ADHD, they must be out of the normal range for a person's age
and development. ADD; ADHD; Childhood hyperkinesis ADHD usually
begins in childhood but may continue into the adult years. It is
the most commonly diagnosed behavioral disorder in children.
ADHD is diagnosed much more often in boys than in girls. It is
not clear what causes ADHD. A combination of genes and
environmental factors likely plays a role in the development of
the condition. Imaging studies suggest that the brains of
children with ADHD are different from those of children without
ADHD. Symptoms of ADHD fall into three groups: - Not being able
to focus (inattentiveness) - Being extremely active
(hyperactivity) - Not being able to control behavior
(impulsivity) Some people with ADHD have mainly inatt