Temporomandibular joint (TMJ) dysfunction can cause a variety of uncomfortable symptoms, including jaw pain, headaches, clicking or popping sounds when opening the mouth, stiffness in the neck and shoulders, and even tension in the upper back. Many people hold a lot of tension in the jaw and surrounding muscles due to stress, which can exacerbate these symptoms. TMJ issues can also be caused by teeth grinding, misaligned bite, posture problems, or injury. While these issues m