The pain on both sides of the stomach of pregnant women like cramps, there are several reasons for this situation: 1. It is indeed caused by muscle cramps, most often also have hypocalcemia, or not timely supplementation of calcium and vitamin D during pregnancy, and cause hypocalcemia. 2. Due to nerve discharges, such as muscle tissue or increased contents of the abdominal cavity, especially when pregnant can cause nerve stimulation, and cause nerve discharges. 3, the main thing is that it may be fetal movement or fetal factors, to late gestational age after the increase in fetal movement, sometimes the fetus will appear respiratory erratic, or repeated jerking, muscle jumping, conduct to the abdominal cavity may cause this situation. In conclusion, we should first rule out adult problems and perform calcium ion tests and abdominal neurological and content tests, and then perform fetal tests to identify and solve the problem.