The main functions of the temporomandibular joint are involved in mastication, articulation, swallowing and expression. Temporomandibular joint disorder syndrome is one of the common diseases of the oral and maxillofacial region. It occurs in young adults, with the highest prevalence between the ages of 20 and 35. It usually occurs on one side, but some can gradually involve both sides. Temporomandibular joint disorder syndrome generally has a long course and often recurs, mostly due to functional disorders, but also can have joint structural disorders or organic damage, so it should be taken seriously and treated early. Etiology 1, mental factors; 2, occlusal relationship; 3, excessive joint load; 4, partial chewing habits; 5, trauma, yawning excessive mouth opening, sudden cold stimulation, poor sitting posture and dental disease, etc., can also cause injury to the temporomandibular joint, surrounding muscles and ligaments and cause the onset of the disease; 6, malnutrition, endocrine disorders, etc. also have a certain relationship with the occurrence of the disease. Diagnosis: 1. It occurs in young adults and is more common in females; 2. There is a history of temporomandibular joint dysfunction; 3. 6. Endoscopic examination of joints: the lesions in the joint cavity can be observed directly and the diagnosis can be made directly according to the observed results. Misdiagnosed diseases 1.Tumor deep in the maxillofacial area: it can cause difficulty in opening and closure of teeth, and the symptoms are similar to TMJ disorder syndrome, which can be easily misdiagnosed, and if there is inappropriate treatment, the chance of tumor eradication will be missed; 2.Temporomandibular arthritis: acute septic TMJ is characterized by redness and swelling of the joint area, obvious pressure pain, and the upper and lower teeth cannot be paired; rheumatoid TMJ is often accompanied by systemic Rheumatoid TMJ is often accompanied by generalized, multiple arthritis, and joint ankylosis may occur in the late stage; 3. otogenic diseases: external ear canal boils, otitis media, etc., whose pain often radiates to the joint area and affects opening and chewing, and careful otologic examination should be performed for diagnosis; 4. it should also be differentiated from cervical spondylosis, hyperkeratosis, hysterical dental closure, tetanus dental closure, etc. (1) Conservative treatment is the main treatment, and a combination of symptomatic treatment and elimination or weakening of the causative factors is used; (2) Treatment of local symptoms of the joint should be accompanied by improvement of the general condition and the mental state of the patient; (3) Patients are educated about medical knowledge, so that they understand the nature of the disease and the pathogenic factors, so that they can increase their confidence and cooperate with the doctor in treatment, and under the guidance of the doctor (4) To determine a reasonable treatment plan in a gradual and orderly manner. (2) Physiotherapy: local infrared irradiation and helium-neon laser irradiation can be used for one week, one minute each time, one time a day, and one week as a course of treatment; (3) Dental treatment, orthodontic treatment and orthodontic treatment can also be used; (4) If there are obvious indications for surgery, surgical treatment can also be used.