The symptoms of foot cramps while sleeping during pregnancy may involve the following influencing factors: first, calcium deficiency, the amount of calcium needed by pregnant women is still very large, if not timely replenished, calcium deficiency will occur, calcium deficiency leads to neuromuscular dysfunction, which leads to cramps. During the night sleep, most of the organs of the body are in a dormant state, producing low calcium, plus the lack of calcium intake of pregnant women, it is more likely that the symptoms of cramps will occur. Secondly, during sleep, the uterus in the abdominal cavity compresses the inferior vena cava, leading to obstruction of blood flow to the lower limbs, resulting in stagnation and blood stagnation in the lower limbs, which can easily stimulate muscle dysfunction and produce cramping symptoms. Third, if a pregnant woman is combined with hyperemesis, she is also prone to leg cramps. It is recommended that if the cramps are frequent, the patient must go to the hospital for consultation.