Multi factorial, life style, stress, trauma to the joints muscles or jaws. Unbalanced bites especially jaw displacements, muscle spasm.
Lifestyle e.g lack of sleep, disturbed sleep, cold environment, life’s stresses
Trauma, changes in the mouth e.g. new restorations, loss of teeth, high fillings, jaw displacements. Dietary factors e.g. drinks with stimulants, red meat, coffee, cafeen.
History & features...