Neck pain, jaw pain, and migraines can be interrelated, and their connection is frequently multifaceted. A person's sternocleidomastoid (SCM) muscle is a powerful neck muscle that helps people bend their neck and turn or tilt their head. Your neck SCM muscle moves in conjunction with your jaw and head. Your trapezius muscle connects at the base of your skull. This means that if a person clenches their jaw, nerves and ligaments can also be impacted by the compression of these jaw joints.