The reasons for leg cramps during pregnancy are as follows: 1. When the muscles of the human legs contract, they need a lot of calcium to ensure normal muscle contraction. When a pregnant woman’s daily calcium intake is insufficient, the leg muscles are stimulated and the muscles contract more excitedly, and spasms occur, also known as leg cramps. During the daytime the calcium level of pregnant women is higher than at night, so at night pregnant women are more likely to have leg cramps. 2, during pregnancy, fetal bone development also needs a lot of calcium, and calcium is mainly provided by the mother, if pregnant women lack calcium, they can not provide sufficient calcium to the fetus. 3, the causes of leg cramps in pregnant women are not only calcium deficiency, during pregnancy when pregnant women have an unbalanced diet and incomplete nutrition, there is a possibility of The situation of malnutrition, at this time will also affect the healthy development and growth of the fetus. When pregnant women only consume a lot of meat, meat contains a lot of protein, excess protein will hinder the metabolism of pregnant women, will accumulate a lot of acidic metabolites in the body, so that the leg electrolyte disorders, will also cause leg cramps.