If muscle cramps occur in the calves, they are caused by external stimuli or their own causes, resulting in a strong and continuous contraction of the calf muscles, producing muscle spasms. Once the cramp is a little longer, it can lead to slight damage to the muscle fibers and cause painful symptoms in the calf, as well as significant painful symptoms due to impaired local blood circulation caused by the muscle spasm. So once the calf cramps, it is best to immediately carry out stretching exercises or movements of the calf muscles to resist muscle contraction and spasm, to prevent the muscle from occurring too long ischemia, hypoxia and lead to increased damage. When exercising, you need to warm up well in advance to prevent sudden muscle spasms, and usually pay attention to the warmth of the legs to prevent the reoccurrence of calf cramps due to cold stimulation.