The pain in the jaw is often caused by the following reasons: 1. There may be damage to the jaw itself, which is often caused by direct impact during a fall or a violent blow during a fight, leading to bone contusions or even fractures, resulting in pain. 2. This disease is often caused by a wide range of mouth opening and closing movements, or chewing excessively hard food, resulting in anatomical abnormalities or inflammation of the TMJ, which can also lead to jaw pain. 3. It may be caused by periodontal infection, such as severe periodontitis may lead to pain in the entire jaw. 4. 5. This condition may also be related to brain nerve stimulation, such as facial nerve stimulation, and the patient may feel similar symptoms.