Attention deficit hyperactivity disorder (ADHD) is a behavioral disorder. It is characterized by ongoing problems with inattention and/or impulsivity and hyperactivity. It is usually first diagnosed in childhood.
Kids who have ADHD have problems staying focused, have trouble sitting still and are impulsive, which means not being able to control behaviors. These symptoms must be present in two or more settings (for example, home, school, and with friends).
The symptoms of hyperactivity and impulsivity are almost always apparent by the age of 7 and may be apparent in very young preschoolers. These symptoms often get in the way of the child's ability to interact appropriately with peers, siblings and adults.
They also affect the child’s ability to follow rules and to not engage in behaviors which may be physically dangerous. The symptoms of inattention often not do not appear until a child faces the expectations of elementary school.