When yawning, if there is the appearance of chin rattling, 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 rattling sound; Second, seen in the temporomandibular joint arthritis, and temporomandibular joint part of the damage, degeneration related to the temporomandibular joint part of the obvious cartilage degeneration, and surrounding ligaments, joint capsule spasm, so that with yawning and opening the mouth, there will be abnormal friction inside the joint, thus causing the appearance of the rattling sound, and serious will lead to the appearance of the rattling sound. Очевидная дегенерация хряща и окружающих его связок, спазм суставной капсулы, так что при зевании и открывании рта возникает ненормальное трение внутри суставов, вызывающее дребезжание, а при серьезных заболеваниях — очевидную боль в области челюсти и затруднение при открывании рта.