10/03/2026
A tight sternocleidomastoid (SCM) muscle—the large muscle running from behind the ear to the clavicle and sternum—causes neck stiffness, reduced mobility and headaches behind the eyes. Often caused by poor posture ("tech neck"), stress or whiplash. It can create trigger points leading to pain, dizziness, vertigo or jaw pain. Relief typically involves stretches, self-massage, heat and posture correction.
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