In the more than 100 years since ADHD was introduced, psychiatrists, pediatricians, psychologists, and educators around the world have explored the causes of the disorder from multiple perspectives, but no consensus has been reached. According to a family survey of several children with ADHD, the following causes are summarized: a. Insufficient amount of brain neurotransmitters Some people believe that the occurrence of ADHD may be a pathology caused by insufficient amount of brain neurotransmitters that cannot be transmitted in a timely manner. Decreased concentrations of neurotransmitters in the brain (such as norepinephrine and dopamine) can reduce the inhibitory activity of the central nervous system and increase the child’s movements. The drugs used to treat ADHD have a chemical structure similar to that of norepinephrine, and after taking the drugs, they can, through various pathways, increase the content of norepinephrine and make the child move less, so children with ADHD must be treated with drugs. Approximately 85% of children with ADHD are due to frontal or caudate nucleus dysfunction, including: 1) maternal diseases during pregnancy: hypertension, nephritis, anemia, hypothermia, pre-eclampsia, flu, etc.; 2) abnormalities during delivery: premature delivery, forceps delivery, caesarean section, asphyxia, intracranial hemorrhage, etc.; 3) children with central nervous system infection and trauma within 1-2 years after birth have a higher chance of developing ADHD. More. Lead poisoning is an encephalopathy caused by high lead content in the blood. More than half of the children with ADHD have high lead levels. Genetic factors are said to be related to heredity. From the onset of ADHD, nearly half of the affected children’s parents or siblings and other relatives have the disease, and the rate of identical twins with the disease is as high as 80%. There are more pathological personalities, alcoholics and hysterical patients in the families of children with ADHD than in the families of children in general. In addition, many children with ADHD have congenital malformations, some of which are related to their congenital qualities and are hyperactive in the fetus. About 40% of the parents of children with ADHD, their siblings and other relatives, in their childhood also suffer from this disease, the above points are suggestive of genetic factors and ADHD close relationship. Fifth, other factors In recent years, many parents of only children “hope that their children will become dragons” eager, due to improper educational methods and early intellectual development of excessive, so that the pressure of the external environment is far more than the child’s ability to degree, is the current cause of hyperactivity in children (inattentive, hyperactive) one of the reasons. In addition, eating artificial dyes in food and consuming a diet containing excessive amounts of lead (not necessarily to the point of lead poisoning) can also lead to hyperactivity. In addition, domestic data show that among the poor family education of children with ADHD, 61.7% of parents are so-called “strict disciplinarians”, 3.5% are permissive, and 7.05% are over-indulgent. Some foreign scholars also believe that violent discipline can cause the child to develop symptoms and add new ones, such as stuttering, eyebrow squeezing and blinking. The indifference, permissiveness and overindulgence of the child may often contribute to the development of symptoms or aggravate the existing symptoms.