It is possible that the following reasons lead to the symptoms of swelling and pain in the calves after running: first, especially people who do not exercise regularly, with the age of the lower limb leg muscle tolerance capacity decreases, cardiorespiratory function will also gradually decline, sudden running exercise will make the muscle tissue quickly into anaerobic exercise, resulting in a lot of harmful substances and metabolic products, stimulating the leg muscles to appear a transient inflammation and produce The symptoms of swelling and pain. Second, if there are sports habits, but occasionally a running time is too long, will lead to legs, especially the calf muscles, fascia serious congestion, local swelling, resulting in the calf muscle gap pressure, internal pressure will be pressed around the soft tissues appear blood circulation disorders, resulting in the symptoms of calf distension and pain. Third, may suffer from lumbar disc herniation and other similar lumbar diseases, because running leads to the onset of the primary disease, thus triggering the symptoms of the lower leg. But this condition usually also has the symptoms of lumbar pain.