Swollen feet in the 6th month of pregnancy is a normal sign in most cases, but it can also be due to conditions such as hypertension during pregnancy. As the weeks of pregnancy increase, the fetus and uterus gradually increase in size. The enlarged uterus will compress the inferior vena cava and obstruct venous return, which can be manifested as edema of the lower extremities, feet and ankles, which is usually normal. However, high blood pressure in pregnancy may also lead to edema of the feet. If headache, blurred vision and other manifestations occur along with edema of the feet, we should be alert to high blood pressure in pregnancy. Under normal circumstances, edema caused by fetal enlargement does not require special treatment, pregnant women can be appropriate activities, rest elevated lower limbs to relieve. However, edema of the feet caused by hypertension during pregnancy needs to be examined and treated in a timely manner in order to avoid other serious consequences.