Causes of calf cramps include cold, overwork, calcium deficiency and so on. 1. Cold: when the outside temperature is cold, the body will take a series of measures to regulate the body temperature, so that the blood calcium changes, and when the blood calcium becomes low, calf cramps will occur. Pay attention to keep warm, after the body temperature rises, the symptoms can be relieved. 2. Overwork: Too much physical labor or too much exercise will cause the muscles to produce a lot of lactic acid, which accumulates in the muscles, leading to calf cramps. You can massage your calves properly, and the symptoms will be relieved after proper rest. 3. Calcium deficiency: Calcium ions can inhibit the inward flow of sodium ions and inhibit muscle excitability. When the body is deficient in calcium, the inhibitory effect on the muscles is reduced and muscle excitability is increased, which will lead to calf cramps. It is recommended to eat more food with high calcium content, sunbathe more, and supplement vitamin D to facilitate calcium absorption. If calf cramps persist, it is recommended to seek medical treatment as soon as possible and standardize the treatment under the guidance of professional physicians.