The etiology and pathogenesis of ADHD are not fully understood. However, it is generally believed to be related to the following factors: 1. Minor brain tissue damage. It is caused by an insufficient amount of brain neurotransmitters, resulting in dysregulation of neurotransmitter transmission messages. For example, viral infections during pregnancy, perinatal hypoxia, the effects of maternal pregnancy, neonatal asphyxia, birth injury, cerebral hypoxia, brain injury, caesarean section, preterm birth, overdue birth, forceps birth, postnatal infection and trauma, etc. 2, genetic factors and various adverse factors together. Molecular genetic studies suggest that there is a correlation between ADHD and dopamine-receptors, the frontal lobe and basal ganglia have an important role in regulating motor activity, and dysfunction in these areas of the brain can reduce their inhibitory function, which can lead to ADHD. 3. Insufficient amount of brain neurotransmitters. Such as norepinephrine, dopamine and other brain neurotransmitter concentration is reduced, weakening the inhibitory activity of the central nervous system, so that the child action increased. Therefore, medication must first be considered for children with ADHD. Parents of non-breast-fed children should pay particular attention to this cause. 5. Psychological factors: Because of the immaturity of children’s psychological development, such as during this period, the family relationship is not harmonious, scolding or inappropriate corporal punishment and discrimination at school will make the child suffer a major psychological trauma, resulting in tics or hyperactivity and other behavioral abnormalities; improper discipline, overindulgence, obedience, will make the child very capricious, arrogant, unwilling or unable to self-control The child’s behavior will be disordered if he or she is not in control of himself or herself; if he or she is too harsh and violent, it will cause excessive psychological tension and emotional repression. Parents are eager to see their children become a dragon, early intellectual development in excess, so that the pressure of the external environment far exceeds the child’s tolerance, is also one of the causes of the onset of Tourette’s Syndrome, ADHD. 6, the lack of trace elements, environmental pollution or poisoning (lead, mercury, cadmium) related. 7, perverted reaction to food (especially additives, artificial colors, condiments, preservatives in food).