Tight muscles in the face, jaw, and neck, and shoulders are the most likely culprit. It's almost certainly not nerves. For me it was "forward head" posture whic

Tight muscles in the face, jaw, and neck, and shoulders are the most likely culprit. It's almost certainly not nerves. For me it was "forward head" posture which needed to be corrected through strengthening exercises and a careful reassessment of my desk work and driving positions. I'd highly recommend visiting a good upper cervical chiropractor.