The occurrence of knee pain after playing badminton is particularly common, playing badminton is a relatively strenuous confrontational sports, before the exercise, the patient did not perform sufficient warm-up exercises, or in the process of exercise, the knee joint is subjected to a large load, which can lead to knee pain after playing badminton. When knee pain occurs, it is best to rest strictly in bed and refrain from further activity. A towel soaked in warm water can be applied to the knee area to speed up the circulation of blood to help and relieve the pain. Patients can also apply local microwave physiotherapy, as well as apply drugs that activate blood circulation and remove blood stasis for relief, such as safflower oil, Yunnan Baiyao aerosol, etc.