Shoulder bone rotation, the cause of the crunching sound, mainly joint popping and tendon calcification, to give targeted treatment, often using muscle exercise, drug therapy, acupuncture and other ways of treatment. 1. Joint popping: When patients move their joints, the friction between cartilage or the friction between joint capsule and cartilage will lead to local popping, which is a physiological phenomenon. When the human body moves the shoulder, the articular cartilage rubs against each other and the synovial membrane reaches its normal position, resulting in a ringing sound, which is not accompanied by pain, and may be accompanied by an obvious sense of comfort, which in turn leads to habitual activities for some patients. 2. Calcification of tendon: It is common in the tendon of long head of biceps muscle. This tendon crosses the shoulder joint. When moving the shoulder joint, because of the calcification of the tendon, it can cause a popping sound due to the friction between the calcified tendon and the edge of the shoulder joint. Patients should avoid excessive activity and be treated with anti-inflammatory pain medications such as celecoxib. Localized closed treatment is also available. The above drugs need to be used under the guidance of a physician.