The most common causes of shoulder pain in playing badminton are excessive exercise, glenoid labral tear of shoulder joint, muscle ligament strain, frozen shoulder, etc. If the pain persists, it is recommended to seek medical treatment in time. 1. Excessive exercise: If the patient plays badminton strenuously, it may cause the accumulation of lactic acid in the shoulder muscles, and the metabolic products of lactic acid may cause shoulder pain, which can be relieved after rest. 2. Shoulder joint labral tear: when playing badminton, you will often make a strong snap, and if the shoulder joint is overly abducted and externally rotated, it is easy to cause shoulder joint labral tear, which will cause pain. 3. Muscle ligament strain: patients in badminton before not fully warm up activities, in the process of receiving the ball, serve the ball is easy to cause muscle or ligament strain, and then produce pain, acute injury can be ice packs. 4. Frozen shoulder: patients with frozen shoulder usually show shoulder discomfort, repeatedly rubbing the shoulder joint when playing badminton, may aggravate frozen shoulder, and then cause shoulder pain. Caused by playing badminton shoulder pain causes more may also have cervical spondylosis and shoulder tumors, etc., if the symptoms of shoulder pain continue without relief, it is recommended to promptly go to the hospital to find out the cause of the disease, the doctor targeted treatment.