- Jaw injury or harm to other head and neck muscles because of trauma such as whiplash
- Movement of the disc or soft cushion between socket and ball of joint
- Stress-related tightening of the jaw and facial muscles
- Joint arthritis
- Tenderness or pain in your face, jaw joint, shoulders and neck when you articulate your jaw
- Difficulty opening your mouth wide for yawning or eating
- Jaw locking in an open or closed position
- Painful or painless sounds of grating, clicking or popping in the jaw joint
- The side of your face begins to swell
- Tired facial sensation