Cold shoulder is usually caused by the following two reasons: 1. The presence of aseptic inflammation around the shoulder joint: This aseptic inflammation is caused by strain, cold or shoulder trauma. Common diseases include frozen shoulder, calcification of the supraspinatus muscle, rotator cuff injury, rheumatoid arthritis, osteoarthritis of the shoulder joint, etc. 2. Prolonged inactivity of the first shoulder joint: Long hours of ambulatory work and little usual exercise. If the shoulder is inactive for a long time, the local blood circulation will be slowed down and the symptoms of cold shoulder will appear, so patients need to pay attention to keep warm and avoid cold shoulder.