Temporomandibular joint dysfunction
（重定向自Temporomandibular joint dysfunction syndrome）
Temporomandibular joint dysfunction (TMD, TMJ, TMJD), also known as temporomandibular joint dysfunction syndrome and temporomandibular disorder among others, is an umbrella term covering pain and dysfunction of the muscles of mastication (the muscles that move the jaw) and the temporomandibular joints (the joints which connect the mandible to the skull). The most important feature is pain, followed by restricted mandibular movement, and noises from the temporomandibular joints (TMJ) during jaw movement. Although TMD is not life-threatening, it can be detrimental to quality of life, because the symptoms can become chronic and difficult to manage.