Sore thighs after running may be caused by the accumulation of a large amount of lactic acid after exercise, you can take rest, hot packs, massage, physiotherapy and other ways to relieve symptoms. 1. Rest: thigh soreness after running, should be appropriate rest, so that the thigh muscles are relaxed, is conducive to relieving the symptoms of soreness. 2. Hot compresses: you can take a hot towel or hot water bag on the legs for hot compresses or soak in a hot bath, which can promote blood circulation, help promote the discharge of metabolic products, alleviate the symptoms of discomfort. 3. Massage: you can cooperate with the leg massage. The way of massage is to massage or knead from the legs upwards, can relax the muscles, have a better role in relieving the pain. 4. Physiotherapy: Low and medium frequency electrotherapy, infrared therapy, ultrasound therapy and other physiotherapy methods can be used to improve blood circulation and relieve the symptoms of pain. Running should be gradual, do not exercise blindly, if it is difficult to relieve, it is recommended to consult a doctor.