Hyperactivity is not easily defined. It often depends on the observer, behaviour that seems excessive to one person may not seem excessive to another however. This can become a problem if it interferes with school work or making friends.
Hyperactivity is sometimes viewed as more of a problem for schools and parents than it is for the child. But many hyperactive children are unhappy or even depressed, because hyperactive behavior may make a child a target for bullying. It may also make it harder to connect with other children. Schoolwork may be more difficult, children who are hyperactive may be frequently punished for their behavior.
Excessive movement (hyperkinetic behavior) often decreases as the child grows older. It may disappear entirely by adolescence.