Sore legs of pregnant women may imply calcium deficiency, exertion, edema during pregnancy or local nerve compression, etc., and need to be treated accordingly under the guidance of a doctor. 1. Calcium deficiency: with the increase of gestational weeks, the calcium needed for fetal bone growth and development will basically come from the mother, when the mother is deficient in calcium, the symptoms of leg soreness will occur, and even the symptoms of muscle spasms in the lower limbs. So from mid-pregnancy onwards, we should increase the intake of calcium-rich foods, such as dairy products, etc., and also follow the doctor’s prescription for calcium supplements. 2. Exertion: when pregnant women stand or walk for a long time, due to the increase of lactic acid produced by the muscles of the lower limbs, can also cause leg pain, and will be gradually relieved after adequate rest, pregnancy should pay attention to the appropriate activities, avoid standing for a long time. 3. Edema during pregnancy: most pregnant women will have edema in the middle and late stages of pregnancy, when the uterus is too large to compress the veins, affecting the venous return, resulting in edema of the lower limbs, which can cause leg soreness and leg swelling. 4. Local nerve compression: if you keep a sitting or sleeping position for a long time, it will cause the symptoms of leg soreness. Therefore, when a pregnant woman has sore legs, she can go to the hospital for examination and be treated accordingly under the guidance of the doctor.