Traumatic factors Many patients have a history of local trauma. For example, acute trauma such as external impact, sudden biting of hard objects, excessive mouth opening (e.g., yawning), frequent chewing of hard food, nighttime teeth grinding, and unilateral chewing habits. These factors may cause joint contusions or strains, and dysfunction of the masticatory muscle groups also have an impact on the occurrence of this disease. It is a common disease of the oral cavity, occurring in young and strong people aged 20 to 40, more often in women, and often on one side. Because many people do not have obvious symptoms in the early stage and do not seek medical attention in time, therefore, most of the patients seen in the clinic are chronic patients, and the course of the disease can be from a few months to several years, more than ten years. Early onset, acupuncture, local sealing, manipulation and other treatments have good results, if the disease is prolonged for a long time, the above methods are difficult to cure, the application of acupuncture therapy to make this problem can be better solved. The cause of temporomandibular joint dysfunction is complex, but it is generally believed to be caused by chronic strain on the joint, and is closely related to mental tension, unilateral long-term forceful chewing of hard objects, dental defects, trauma and cold stimulation, congenital malformation, etc., because they can cause the loss of mechanical balance of the muscles around the joint and induce the disease.