Calf cramps are a common symptom in daily life, partly due to exertion, partly related to calcium deficiency, causing muscle cramps, and need to be supplemented with foods containing calcium, such as shrimp, kelp, dairy products, etc. Some calf cramps may be related to electrolyte deficiency in the body, such as electrolyte dilution after drinking a lot of water, causing convulsions. If calf cramps occur frequently, simple dietary supplements may be far from enough, but also need to supplement calcium tablets, vitamin D, vitamin D can promote the absorption of calcium, supplemental calcium can not eat food with too much oxalic acid content, so that oxalic acid can easily combine with calcium to form precipitates, and does not participate in the regulation of calcium, the supplemental calcium will not be of much use.