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				Attention Deficit/Hyperactivity Disorder Attention-Deficit/Hyperactivity Disorder (AD/HD) is a condition that can make it hard for a person to sit still, control behavior, and pay attention. These difficulties usually begin before the person is 7 years old. However, these behaviors may not be noticed until the child is older. Doctors do not know just what causes AD/HD. However, researchers who study the brain are coming closer to understanding what may cause AD/HD. They believe that some people with AD/HD do not have enough of certain chemicals (called neurotransmitters) in their brain. These chemicals help the brain control behavior. There are three main signs, or symptoms, of AD/HD. These are: problems with paying attention being very active (called hyperactivity) acting before thinking (called impulsivity) back to disabilities page.

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