Often parents will come to the clinic and ask, what is ADHD? What causes ADHD? Song Fengling, Children’s Health Center, Jinan Children’s Hospital ADHD, also known as Attention Deficit Hyperactivity Disorder, or ADHD for short, is characterized by inattention and short attention spans, excessive activity and impulsivity that are not commensurate with age and developmental level, and is often accompanied by learning difficulties, behavioral disorders and maladjustment. It is often accompanied by learning difficulties, behavioral disorders and maladjustment. It is influenced by a combination of biological and socio-environmental factors. Biological factors include genetics and abnormalities in brain structure and function. A child is likely to develop ADHD if his or her parents carry genes associated with ADHD, which are linked to certain chemicals synthesized in the brain that are in turn linked to behavioral control. In children with ADHD, there is a decrease in the synthesis of these chemicals, a decrease in the functioning of the brain, and a decrease in the ability to manage behavior, resulting in hyperactivity, inattention, and other behavioral problems. In addition, there is a part of the brain called the “prefrontal lobe”, which is in charge of a person’s self-control, and if it is abnormal, the child may also show symptoms of hyperactivity. It is now believed that infections during the mother’s pregnancy, smoking, drinking alcohol, and malnutrition may be related to damage to the prefrontal lobe. The role of social and environmental factors in the development of ADHD cannot be ignored. If there is a lot of conflict in the family, there is no sense of intimacy between family members, the family is harsh on the child, either hitting or scolding, and over-indulgence can also lead to behavioral problems in the child.