Muscle pain after a leg cramp, a condition that is mainly due to the violent contraction of the muscle during the cramp, resulting in a slight strain of the muscle fibers inside the muscle, will stimulate the peripheral nerves. It is also possible that inflammatory edema will form locally, which will stimulate the peripheral nerves and cause pain in the muscle area. The following measures should be taken after this situation: First, it is important to keep the muscles fully relaxed and to keep them warm, otherwise there is a risk of re-inducing pain in the muscles. Because muscle fatigue can produce inflammation, and after the muscle has been cooled, it will cause the muscle tissue to become more tense, which will induce muscle cramps when the muscle is exerted. Second, to do a good job of keeping the leg muscles warm, you can apply warm water bags for hot compresses to increase blood circulation in the muscle area, increase arterial blood supply, promote venous reflux, reduce local inflammatory lesions, reduce inflammatory metabolites and lactic acid, etc., can effectively prevent muscle cramps again, and can relieve muscle pain.