Temporomandibular Joint Disorder includes a variety of conditions that cause tenderness and pain in the temporomandibular joint (TMJ). Your TMJ is the ball-and-socket joint on each side of your head where your lower jawbone (mandible) joins the temporal bone of your skull.
Temporomandibular Joint Dysfunction (TMD) is the result of your teeth, facial muscles and jaw joints being out of alignment with each other.