Pain in the arm when playing badminton is usually due to incorrect posture when playing badminton and leads to epicondylitis of the humerus. Or the pain is due to excessive exercise, which leads to chronic muscle strain. The following treatment can be carried out: 1, stop playing badminton. Rest or reduce the amount of exercise to play badminton, which has a good effect on the recovery of muscle damage. 2, physical therapy. The painful area can be treated with hot compresses or microwave physiotherapy, far-infrared physiotherapy, etc. 3, the treatment of topical drugs. This is also beneficial to the recovery of the injury. 4. Finally, if the arm pain is due to epicondylitis, early treatment is required, including closure therapy and, if necessary, surgical loosening to relieve the pain.