Temporomandibular joint (TMJ) disorder is a medical condition wherein the temporomandibular joint of the jaw becomes misaligned and causes pain throughout the face, head, neck and even the back. Patients with the disorder often have trouble being diagnosed because of the range of symptoms – which, in addition to the aforementioned pain, can include tinnitus, clicking or popping of the jaw, teeth grinding (bruxism), migraine headaches, and muscle aches. But one symptom in particular is much more obviously related to TMJ disorder - and a lot harder to deal with.