Thigh pain after running is mostly caused by the accumulation of lactic acid during running, it is recommended to cooperate with leg massage to relieve the pain, most patients can disappear on their own after 2-3 days. The causes of thigh pain after running are many, including local muscle strain, excessive exercise, lactic acid accumulation or local lesions, but the main cause is lactic acid accumulation. The patient can relieve the soreness through leg massage, and those with more serious symptoms can be given a local hot compress or hot bath, and topical ointment for relief. In addition, although the benefits of running are more, can exercise the body, improve immunity, but need to pay attention to the time and intensity, otherwise easy to lead to lower limb muscle strain. It is recommended to avoid resting immediately after running, to slow down the speed of walking for a period of time before resting, to drink warm sugar and salt water, to avoid drinking ice water directly, and to take a hot bath before going to bed.