Leg pain in the sixth month of pregnancy may be caused by the obstruction of reflux due to the enlargement of the fetus and uterus, calcium deficiency and other reasons. After pregnancy, as the fetus and uterus grows, it will cause the pressure in the abdominal cavity to increase, which will cause the blood and lymphatic fluid in the lower limbs to be blocked, resulting in the blood and lymphatic fluid being stagnant in the lower limbs, leading to the situation that the pregnant woman can’t walk because of the pain in her legs. In addition, due to the rapid growth of the fetus, pregnant women failed to supplement calcium in time, resulting in a lack of calcium in the body of pregnant women, calcium deficiency can cause pregnant women to have leg pain and can not walk. Leg pain in the sixth month of pregnancy can also be caused by lumbar disc herniation and other reasons. If a pregnant woman has leg pain during pregnancy, it is recommended that she consult a doctor, under the guidance of the doctor, improve the relevant examination, clarify the cause of the disease, and symptomatic treatment.