The majority of pregnant women have swollen feet, but of course, the degree of edema varies among individuals. 1, most pregnant women with swollen feet during pregnancy are physiological phenomena, and the degree of edema is limited to the back of the foot or ankle, which occurs mainly because the uterus enlarges and compresses the inferior vena cava, causing edema due to obstruction of blood flow to the lower extremities. 2, the combination of severe anemia during pregnancy is also the main cause of edema during pregnancy. The main cause of oedema during pregnancy is the need to take iron supplements for treatment. 3, oedema during pregnancy should also be considered the possibility of hypertension in pregnancy, in which case the patient’s blood pressure rises significantly and urine tests are often positive for urine protein.