Shoulder pain when lifting heavy objects can have the following causes: First, acromioclavicular arthritis, acromioclavicular arthritis is often caused by degeneration or sprains of the acromioclavicular joint, which can cause pain in the acromioclavicular joint above the shoulder when lifting heavy objects, then we should check the X-ray of the shoulder joint for diagnosis and treatment. Second, rotator cuff tears, when the rotator cuff of the shoulder joint is torn, there can be pain at the rotator cuff of the shoulder when lifting heavy objects, accompanied by obvious limitation of shoulder joint movement, then it is necessary to check the MRI of the shoulder joint for diagnosis and early treatment. Thirdly, in the case of frozen shoulder, patients with frozen shoulder can also have limited movement of the shoulder joint in all directions and pain in the shoulder joint, and can have obvious pain or increased pain in the shoulder joint when lifting heavy objects, so it is important to check the body and examine the X-ray and MRI of the shoulder joint early for diagnosis and treatment.