The causes of soreness and pain in the leg belly are as follows: First, there may be more exercise, so the leg belly will accumulate more lactic acid, more likely to accumulate in the skeletal muscle more developed places, at this time there will also be obvious soreness in the leg belly. Second, the common cause may be muscle strain during exercise, such as the incorrect method of exercise will lead to soft tissue damage, there will also be obvious calf stomach pain. Third, orthopedic diseases can also cause soreness in the calf, such as meniscal strain, meniscal ligament injury, or knee injury. Fourth, fever, cramps, heat exhaustion, and heat stroke after infection may also cause soreness in the calves due to heat exhaustion. Fifth, the rest of toxic diseases, drug-related diseases, may cause the transverse muscle in the process of dissolution, the symptoms of significant soreness of the calf stomach.