In daily life, patients experience muscle cramps and pain in the legs. Most of the reasons for the onset of the disease are that the patient did not get rest in time after exercise or did not prepare for warm-up before exercise, resulting in excessive accumulation of lactic acid in the muscles, and the muscles have nutrient metabolism disorders, and the patient will have cramps and pains. In the treatment, the patient is first required to rest in bed, stop exercising, and can take a hot bath or take carbohydrate supplements, which can help to relieve pain. In addition, in the leg, we should also give external ointment to activate blood circulation and eliminate blood stasis, reduce swelling and pain, or with the physiotherapy instrument baking electricity, infrared therapy, bioelectric therapy, low and medium frequency electrotherapy and other methods, can accelerate the local lactic acid metabolism, it can play a role in relieving cramps and pain.