Cramp-like pain in the calf is mainly due to spasmodic contraction of the local muscles, resulting in muscle strain or strain injury, resulting in pain symptoms. Common causes include the following aspects: first, local muscle injury and strain, due to the existence of injury and strain, the local will produce hematoma inflammatory reaction, muscle fibers will be congested and so on, thus leading to dysfunction, in some cases will lead to spasmodic muscle ankylosis, resulting in pain symptoms; the second can be seen in the calf there are varicose veins, phlebitis or arterial injury, Secondly, it can be seen in the presence of varicose veins, phlebitis or arterial injury, thrombosis and so on, resulting in poor blood circulation in the calf muscles, thus increasing anaerobic metabolism, the accumulation of anaerobic metabolites stimulation will lead to spasmodic contraction of the calf muscles; thirdly, it can be seen in the calf of localized nerve problems, for example, nerve injury, neuritis, or nerve compression, lumbar intervertebral disc herniation and so on, will be due to the abnormal function of the nerves, which can result in the innervation of the muscles