Symptoms of ADHD: I. Hyperactivity. Most children will show sleep disturbance, feeding difficulties, etc., to preschool and school-age symptoms are more obvious, often manifested as hyperactivity, annoying, classroom actions, often disturb others, inattentive, distracted in class, listening to lectures, homework easily distracted, do anything can not be good, stick to the end. Second, emotional instability, impulsive and capricious. The child lacks self-control, is easily provoked, and does everything regardless of the consequences. Learning difficulties. Most children with this disease have normal or near-normal intelligence, but hyperactivity, inattention and emotional instability can cause some difficulties in learning. In the diagnostic criteria, it is emphasized that the hyperactivity, impulsiveness and inattention of this disease are incompatible with the development and age of normal children; therefore, physiological age-appropriate hyperactivity cannot be diagnosed as ADHD in children.