Shoulder pain alert cervical spondylosis, rotator cuff injury, frozen shoulder, biceps long head tendonitis, shoulder impingement syndrome, osteoarthritis, coronary heart disease. 1. Cervical spondylosis: cervical degeneration and compression of nerves can radiate to the shoulder pain, and radiate to the arm, and some will have numbness. 2. Rotator cuff injury: shoulder joint degeneration or trauma caused by shoulder joint ligament rupture shoulder pain, active activities are limited, passive activities are normal. 3. Frozen shoulder: adhesion of muscles, ligaments and joint capsule around the shoulder joint causes pain in the shoulder joint, and active and passive activities are obviously limited. 4. Biceps tenosynovitis: pain in front of the shoulder joint caused by chronic strain, aggravated after exertion and alleviated after rest. 5. Acromioclavicular Impingement Syndrome: the pain is mainly caused by the injury of supraspinatus muscle due to the impingement of humeral tuberosity and acromion when the shoulder joint is abducted and lifted. 6. Osteoarthritis: joint degeneration and narrowing of joint space cause pain and limitation of shoulder joint activities. 7. Coronary heart disease: angina pectoris can radiate to the left shoulder pain. Shoulder pain should be checked in the hospital to clarify the specific causes for treatment.