The main causes of vague pain in the jaw are trauma, mumps, cellulitis, etc. 1. Trauma, if the jaw area is hit by external force, it may lead to damage to the teeth, bones and soft tissues around the jaw, so the symptoms of hidden pain in the jaw may occur. 2. Mumps, some patients with mumps may experience pain in the parotid gland due to the inflammation that stimulates the parotid gland, which pulls on the lower jaw, and thus may cause vague pain in the lower jaw. 3. Cellulitis. In some patients, cellulitis may lead to worsening of the infection as the bacteria enter the body through the skin, resulting in tenderness in the jaw. If you experience frequent pain, it is advisable to seek medical attention.