Pregnant women have leg cramps, commonly known as leg cramps, can be caused by a variety of reasons, as follows: first, calcium deficiency, which is the most common cause, because calcium deficiency causes leg cramps, not only in the elderly, but also often in pregnant women, is due to the increased demand for calcium in the process of pregnancy and the fetus, not simply the amount of calcium supplementation can be maintained when not pregnant before. Nowadays, the demand for calcium increases greatly during pregnancy, especially in the middle and late stages of pregnancy, and if the calcium supplementation is not timely or the daylight hours are short, the patient can experience the situation of turning the leg stomach. It is recommended that pregnant women eat more food with high calcium content and take calcium tablets if necessary. Secondly, exertion can also cause the situation of turning leg stomach, in the middle and late stages of pregnancy, the weight of the abdominal cavity increases, so that the lumbar vertebrae, hip joints, knee joints and other weight-bearing increase, after exertion can also occur the situation of turning leg stomach. In general, it is recommended to take more rest and move around appropriately.