Shoulder pain may be caused by physiological reasons such as excessive exercise, or due to trauma, frozen shoulder, cervical spondylosis and other pathological reasons. 1. Excessive exercise: Excessive exercise or workout of the shoulder, resulting in the accumulation of lactic acid in the local muscles, can cause shoulder pain and soreness, which can be relieved after resting. 2. Trauma: Shoulder fracture or soft tissue injury can be caused by external force, which will result in shoulder pain, swelling and limited activities. 3. Frozen shoulder: due to the degeneration of the shoulder joint, trauma and other factors, resulting in inflammation of the shoulder joint capsule and tendons and other soft tissues, causing pain and limited movement of the shoulder joint. 4. Cervical spondylosis: The cervical intervertebral disc degeneration and protrusion can cause the nerve root innervating the shoulder and upper limb to be stimulated or compressed, which can cause the symptoms of radiating pain and numbness in the shoulder. There are many other causes of shoulder pain, such as rotator cuff injury, myofasciitis, visceral diseases, etc. If rest does not relieve, it is recommended to go to the hospital in a timely manner to improve the relevant examinations, to clarify the cause of the disease and then follow the doctor’s instructions for targeted treatment, so as not to delay the condition.