If the exercise is very painful in the later stages of frozen shoulder, it may indicate that there is a problem with the way and method of exercise or a new injury has been created. According to the current orthopedic rehabilitation principles, all joint training should be carried out on the principle of no pain or slight pain. If it is too painful and one is forced to make rapid progress, it is not only easy to cause injury, but also cause muscle spasm due to the pain and cannot achieve a good training effect. For arthritis patients, high-intensity activities or repeated certain movements can easily cause tears and ruptures in tendon and ligament tissues. When patients have this condition, they need to undergo an MRI or musculoskeletal ultrasound of the shoulder to clarify whether there is any aggravation of the condition. Meanwhile, in the process of training, whether it is therapist-assisted training or self-exercise, it is important to make gradual progress. Avoid secondary injury to the shoulder. Once an abnormal training response occurs, feedback to the doctor and therapist should be timely.