Swollen feet during pregnancy is a relatively common phenomenon, most of them belong to physiological manifestations, and individual cases may be caused by pathological factors, as explained below: 1. If the symptoms of edema are only limited to the back of the foot, or the ankle area, they are generally physiological. The edema is caused by the enlargement of the uterus after pregnancy with the compression of the inferior vena cava, which obstructs the blood circulation of the lower limbs. This symptom usually does not require special treatment, pay attention to the combination of work and rest, do not sit or stand for a long time, and elevate the lower limbs appropriately during rest to promote blood circulation. 2. If the edema extends further to the lower legs, you should go to the hospital for laboratory tests of blood routine, urine routine, kidney function and blood pressure measurement to determine whether the edema is caused by anemia or gestational hypertension syndrome.