The temporomandibular joint (the TMJ) is a major joint in your jaw that helps you open and close your mouth to eat, laugh, drink, chew, and talk. TMJ muscles run alongside your jaw and cheeks, and can sometimes cause pain, including headaches.
When stress occurs in life, some people may bite their nails, fidget, and do various other things to calm their nerves. For others, their body’s response is to clench down, a habit called jaw clenching, which can lead to teeth grinding. Jaw clenching and teeth grinding may happen subconsciously or while sleeping.