Stress, any injury to the jaw, dislocation of disc between ball and socket of the joint,
grinding the
teeth can all lead to Temperomandibular joint disorders. There may be pain or tenderness in the face, limitation of movement at the joint, difficulty in chewing, swelling on side of face, clicking sounds in jaw joint etc. A careful history, physical examination and X-rays will help in determining the cause. Consult a dentist. Do keep me posted.
Best luck and regards!