Cramps at night in the fifth month of pregnancy may be because the pregnant woman’s body has a greater demand for calcium, because of insufficient absorption of calcium, blood calcium level is not enough to cause a state, so this time should be strengthened calcium supplementation, to provide the body with the need for more calcium. Pregnant women themselves need calcium, in addition to the growth of the fetus also need calcium, so to strengthen the calcium supplement, in order to avoid leg cramps, calcium deficiency is the most important cause of leg cramps. The fifth month of pregnancy because of the weight gain at this time, resulting in leg muscle fatigue, weight bearing increase, so that the muscles are easily fatigued, or excessive activity is also easy to lead to muscle fatigue, excessive fatigue is also easy to lead to leg cramps. There is also the night may also be due to sleep careless, leg muscles cold and other circumstances also easily lead to leg cramps, this time to pay attention to keep warm. In addition, do not exercise too much during the day, so as to help correct the situation of cramps.