Temporomandibular joint (TMJ) syndrome is a disorder of the jaw muscles and nerves caused by injury or inflammation to the temporomandibular joint.  The temporomandibular joint is what connects your skull to your jaw. Lots of the structures (muscles, vessels and nerves) that go to your head and face, are the same that the ones which go to your neck. Hence, any injury or disorder in those structures can cause referred pain to your Temporomandibular joint.  There are several risk factors for TMD:  -Poor posture in the neck and upper back muscles may lead to neck strain and abnormalities of jaw