1. First of all, it may be caused by improper running posture and uneven exertion of both lower limbs. This situation does not need special treatment, and it can be relieved automatically after rest.

2. Insufficient warm-up before exercise has affected local soft tissue and tendon injuries; If you exercise too much, it will also cause knee pain.

3. In addition to the above reasons, the patient's own joint problems need to be considered. Such as articular cartilage wear, meniscus injury and so on. When soft tissue is injured, if you don't wear the corresponding protective equipment when running, it will cause further local injury and lead to knee pain.