Lateral plantar pain after running is usually related to physiological factors, soft tissue injury, ligament injury and other factors. 1. Physiological factors: Lactic acid accumulation will occur after running, which will easily cause lateral plantar pain. It is a normal performance, and no special treatment is needed. 2. Soft tissue injury: If the amount of exercise is relatively large, and the soft tissue is injured in the process of running, it may lead to local edema, pain and other symptoms, and in serious cases, it will affect the normal activities. 3. Peroneal tendonitis: If you suffer from peroneal tendonitis, increasing the local burden during the running process will easily lead to a significant increase in pain, accompanied by a sense of swelling. Running on the outside of the sole of the foot will be painful, may also be the plantar tendonitis, skin lesions and other factors, to rule out physiological causes need to consult a doctor in a timely manner, to clarify the cause of the disease, and then targeted treatment.