The temporomandibular joint is commonly irritated area. This can present as jaw pain, but it can also be the cause of headaches. The joint is unique in that it consists of a disc much like that of the intervertebral disc. It also has a unique motion, which is combination of a gliding and hinge types of movements. There are also a number of muscles of that joint, including the masseter, temporalis, internal pterygoid, and external pterygoid. The joint can become imbalanced by chewing gum or food on only one side consistently, or other types of trauma. Treatment of this joint includes trigger point therapy of the involved muscles, as well as manipulation of the disc in order to correct its position.