The etiology of tic disorder has not been elucidated, but it is generally believed that it may be related to these factors: 1. genetic factors, tic disorder is more common in children’s family members; 2. somatic factors, the beginning of the tic often due to local irritation, such as conjunctivitis or impingement irritation caused by blinking, or due to upper respiratory tract infection and aspiration, facial muscle twitching, when the local cause of the disease is removed, the tic symptoms still persist; 3. 3. psychosocial factors, children’s tics become a constant manifestation of stress due to family life events such as family discord, parental events such as family discord, parental divorce, death of a loved one, and excessive academic burden; 4. organic factors, perinatal damage, such as birth injuries, asphyxia, and other factors may be related to the disorder; 5. pharmacogenic factors, certain drugs such as central nervous stimulants, antipsychotics, etc., taken for a long time may produce a side effect of twitching. Overall, tic disorders may be due to genetic factors and the interaction of multiple environmental factors during development. 6. Common triggers for its onset: watching TV or playing computer for too long, parental discord or divorce, harsh criticism by teachers, moving out of town, child foster care, etc.