Lower limb muscle cramp is also the calf muscle cramp means that the calf itself is forced to contract, resulting in pain or muscle stiffness and other uncomfortable symptoms. The reason for muscle cramps in the calf area is more, mainly the following: 1, fatigue, high-intensity sports during the day or heavy physical labor during the day, resulting in overworked calf area. 2, cold stimulation, calf area exposed to cold stimulation for a long time, thus triggering muscle cramps. 3, due to the lack of calcium in the body, the body if a large number of The calcium deficiency will cause abnormal excitation of the calf muscles, which will lead to muscle spasms.