Pain in the left shoulder joint is usually associated with inflammation around the shoulder joint. Inflammation around the shoulder joint is directly related to chronic strain and trauma, which often leads to damage and calcification of local tendons and ligaments. In the later stages of the disease, adhesions may occur, and as the disease progresses, there may be significant pain around the shoulder joint, with significant pressure pain in the anterior, posterior, and acromioclavicular joints of the shoulder joint. It is also associated with limited flexion and extension of the shoulder joint, the inability to elevate the shoulder joint, and limited posterior extension of the shoulder joint. Patients with supraspinatus tendonitis may also have a painful arc reaction, which is characterized by a significant limitation of abduction of the shoulder joint at 60-120 degrees and an increase in pain in the shoulder joint at 60-120 degrees of abduction. For this type of patients, we must pay attention to avoiding the cold of the shoulder joint, avoiding excessive local stress, and consider taking oral non-steroidal anti-inflammatory drugs for targeted treatment.