If the symptoms of cramps in the left calf are not accompanied by other symptoms of the whole body, such as fever, weakness, night sweats, and wasting, the main reason is to consider the stimulation of local adverse factors that lead to disorders of calf muscle function, and the common situations are as follows: First, the calf is cold, such as the lack of coverage during sleep, resulting in local tissue cold. Not adding clothing in time when it is cold, causing the muscles to get cold, will produce local hypoxia and ischemia, resulting in muscle dysfunction and cramps. Secondly, it can be seen from strain, such as prolonged strenuous exercise or prolonged standing and walking, as well as high workload on the lower limbs, resulting in the accumulation of local muscle metabolites stimulation, as well as the corresponding ischemia, ischemia, resulting in muscle dysfunction, leading to cramping symptoms. Thirdly, it can be seen that the daily workload is heavy, leading to strain on the calf muscles, which can also lead to cramping symptoms. Fourth, neuropsychological factors can also easily lead to cramping symptoms in the calf, such as more nervous, under stressful conditions to carry out the corresponding exercise, it is easy to appear the muscle function of the uncoordinated, resulting in cramping symptoms, neuropsychological factors can also affect the local muscle function, resulting in this situation.