When connective tissue around your shoulder joint loses mobility, it can lead to shoulder stiffness neck pain that gets triggered when you move your shoulder. Here’s the problem: when the shoulder doesn’t move well, your neck has to “pick up the slack.” This adds extra load to the cervical spine and surrounding muscles, which can lead to pain, tightness, and even headaches. Research shows that the shoulder capsule, particularly when stiffened from injury, posture, or lack of movement, alters n