What Does Shoulder Pain Feel Like With an AC Joint Injury?

The acromioclavicular, or AC, joint sits where the collarbone meets the highest part of the shoulder blade. Pain is commonly localised over this small area, with tenderness if you press on it. Reaching across your body, putting on a seat belt, lifting, or lying on that side may increase discomfort. A fall onto the shoulder or a direct blow can cause an injury, while repeated loading may irritate the joint gradually.

Pain may be aching at rest and sharper during a provoking movement. Swelling, bruising, a visible bump, or reduced arm use can occur after a more substantial injury. These features do not confirm the cause by themselves; an examination helps separate AC joint problems from other shoulder conditions.

For a recent injury, protect the shoulder from impact and activities that clearly worsen pain. Use a cold pack wrapped in cloth for short periods, and support the arm if that feels more comfortable. Keep the elbow, wrist, and hand moving, and gently move the shoulder within a tolerable range rather than forcing a stiff or painful motion.

A clinician or physiotherapist can check the joint, strength, and movement. They may suggest a gradual return to reaching, lifting, work, or sport. Do not use a sling for longer than advised, because prolonged stillness can make shoulder movement harder.

Arrange an assessment if pain persists, arm movement remains limited, or a bump, swelling, or bruising developed after an injury. Seek urgent care after a major impact if the shoulder looks deformed, the arm feels numb or unusually weak, the hand is cold or pale, or you cannot use the arm.

Could the tenderness be coming from the AC joint or another shoulder structure? Do I need imaging? Which movements should I avoid temporarily, and how should I rebuild strength?