Calf belly often sore to consider three reasons: the first point, deep vein thrombosis of the lower limbs, patients sitting for a long time, smoking and other factors can easily cause deep vein thrombosis of the lower limbs, deep vein reflux is blocked after the formation of thrombus, easy to cause blood accumulation, the formation of calf belly soreness. The second point, lower limb arterial disease, such as smoking, cold and other factors stimulation, easy to cause lower limb arterial stenosis or occlusion, calf belly soreness, at the same time can appear intermittent claudication. The third point, the lower limbs after exercise led to the accumulation of lactic acid, often caused by calf belly soreness, most often seen in the frequent sports crowd, due to excessive exercise, lower limb muscle secretion of lactic acid, easy to stimulate the local muscles, nerves, etc., caused by the calf belly soreness often. These are the common causes of calf belly pain.