Mandibular joint dysfunction, i.e. temporomandibular joint disorder, is usually manifested as pain in the joint area, joint popping during movement, jaw movement disorder, etc. 1. Joint pain: temporomandibular joint disorder manifests as temporomandibular joint pain, which is aggravated when chewing or opening the mouth, and there are clear pressure points in the muscles of mastication, and the pain can be radiated to the temporal and occipital parts. 2. Joint popping sound during movement: when the temporomandibular joint is diseased, there will be abnormal sound when opening and closing the mouth. 3. Jaw movement disorder: temporomandibular joint disorder has jaw movement disorder, and some patients may have the situation of opening the mouth skewed or the opening degree is small, and the serious cases will have the situation of opening the mouth difficult. Temporomandibular joint disorder patients need to go to the hospital in time, under the guidance of the doctor for targeted treatment.