Since the TMJ itself is an actual joint, any types of degeneration, osteoarthritis, rheumatoid arthritis, or any other forms of inflammation may cause problems. In some cases though, the cause is not always clear. Responses to stress are also thought to be, at least, a contributing factor. Some people clench their jaw when feeling anxious, irritable or when concentrating, keeping the muscles of the TMJ in a contracted position. Clenching the jaw and grinding teeth while asleep is not uncommon either. Any habits that overwork the jaw muscle can intensify the pain of a TMJ disorder.
Musculoskeletal-like headache is one of TMJ disorder symptoms. Other symptoms include pain and tenderness of the jaw, locking up of the joint, difficulty chewing, jaw stiffness, aching pain of the face and inside or around the ear, an uneven bite with teeth making premature contact, and jaw clicking or teeth grating when you open your mouth or chew. In most cases, you will experience pain and tenderness of jaw and temples even when it is not moving.