When yawning, if there is the appearance of jaw ringing, this situation is mainly seen in two aspects of the reasons: First, the appearance of the temporomandibular joint part of the degeneration, osteoarthritis, will be in the yawning, there is the temporomandibular joint part of the cartilage of the abnormal friction, usually will trigger the appearance of the ringing sound; Second, seen in the temporomandibular joint arthritis, and temporomandibular joint part of the damage, degeneration, will lead to temporomandibular parts have Obvious cartilage degeneration, and the surrounding ligaments, joint capsule spasm, so that with yawning and opening the mouth, there will be abnormal friction within the joints, which will cause rattling, and serious will also lead to obvious pain in the jaw area, and difficulty in opening the mouth.