Calf belly cramps may have the following reasons: 1, the most common because of lumbar disc herniation compression of the nerve, resulting in sciatica, sacral nerve root innervation of the area is the back of the calf, that is, the gastrocnemius muscle area, nerve compression will occur after the innervation area of the muscle spasms, that is, cramps, or discharge-like pain. 2, calcium deficiency resulting in hypocalcemia, low blood calcium, cramps can also occur. 3, after prolonged walking or excessive exercise, there is calf muscle strain, fascial inflammation, and then there is pain, pain in the form of a cramp or pain. The most common type of cramp in the clinic is calf cramp.3. After walking for a long time or exercising excessively, there is muscle strain and inflammation of the calf gastrocnemius muscle, and then there is pain, which is mainly throbbing or aching, and the symptoms can be alleviated after resting, but the symptoms may be aggravated after walking.