Christian Goodman’s The TMJ Solution ebook PDF download! Feel free to read now! TMD (Temporomandibular Disorder) refers to problems with your jaw and the muscles in your face that control it. Many people also refer to it as TMJ, although many refer to the temporomandibular joint itself (the hinge that connects your jaw to the temporal bones of your skull) rather than the disorder. TMD often results in pain that limits your ability to open your jaw wide enough to function or eat normally. It can also cause ringing in the ears, and clicking, popping, or grating sounds in the jaw. TMD may also result in chronic headaches, earaches, tinnitus (ringing of the ear), and pain in the neck, back, or upper shoulders.