Does AC joint injury cause shoulder pain?

Shoulder Pain is a common presentation of AC Joint Injury, especially after a fall or direct blow to the shoulder. Pain may be focused at the top of the shoulder and can increase when you lift the arm across your body.

The acromioclavicular, or AC, joint connects the collarbone with the shoulder blade. An injury can stretch or tear the ligaments supporting this small joint, sometimes causing tenderness, swelling, bruising, or a visible bump. Most people with AC Joint Injury notice shoulder pain, but shoulder pain can have many causes and does not identify this injury by itself. Learn more about [Shoulder Pain](/symptoms/shoulder-pain/).

Avoid heavy lifting and movements that sharply increase pain. Rest the arm in a comfortable position and use a cold pack wrapped in cloth for short periods if it helps swelling. A sling may be advised briefly, but prolonged immobilisation can make the shoulder stiff; use support only as directed. A clinician can guide the gradual return of shoulder movement and strengthening.

Arrange prompt assessment after a significant impact, a new shoulder deformity, marked swelling, or inability to lift the arm. Seek urgent help for a cold, pale, blue, or numb hand; severe escalating pain; an open wound; or loss of movement in the arm or fingers. Ongoing pain deserves review because the collarbone, shoulder joint, or nearby tissues may also be injured.

Ask whether the AC joint is the likely pain source and whether an examination or imaging is needed. Discuss the injury grade, sling use, safe exercises, sleep positions, work or sport restrictions, and the signs that should trigger urgent reassessment.