Common Reasons Shoulder Pain Radiates Down the Arm

1. Nerve Involvement (Referred Pain):The neck and shoulder are filled with nerves that travel down the arm. A pinched nerve in the neck or shoulder can send pain signals all the way to your hand. This is often described as burning, tingling, or shooting pain.2. Rotator Cuff Injuries:When muscles or tendons in your rotator cuff become inflamed (often due to shoulder impingement), it can lead to pain that radiates down your upper arm — especially when lifting, reaching, or lying on your side.3. Trigger Points in the Upper Back:Tight muscles