Attention deficit and hyperactivity disorder or ADHD in children: is a group of syndromes that occur in childhood (mostly around 3 years old), compared to children of the same age, and manifest both significant difficulty concentrating attention, short attention span, and excessive or impulsive activity. Symptoms of ADHD: 1. Attention disorders: easily distracted when learning, hear any external sound to visit; very inattentive in class, often look around or daze; do homework procrastination, play while doing, homework is dirty and messy, often do less or do wrong; do not pay attention to details, often careless mistakes in doing homework or other activities; lose or especially do not care for things; difficult to comply with the designated, complete It is difficult to do things for a long time, often one thing is not done, and then go to do something else; distracted when talking with others; often lose things in daily activities. 2, hyperactivity: the need for quiet occasions difficult to sit quietly or twist around in the seat; class small movements, or play things; or whispering with classmates; talk a lot, good interrupter; very noisy, can not play quietly; difficult to comply with the order and discipline of group activities; interference with the activities of others; good and children teasing, easy to children disputes, not welcomed by peers; easily excited and impulsive, have some excessive Behavior; running and climbing ladders on inappropriate occasions, risky.