Many mothers in the middle and late stages of pregnancy will have different degrees of foot swelling, what causes pregnant women to have swollen feet: 1, during pregnancy there will be a physiological increase in blood volume, resulting in increased pressure in the blood vessels, a small amount of tissue fluid exudation, will cause lower limb edema. 2, the enlarged uterus compressing the inferior vena cava, so that the lower limb venous blood return is blocked, is also the main cause of edema. Lower limb edema caused by the above-mentioned reasons is physiological, and the degree of edema is usually not very serious and does not require special treatment. Usually pay attention to eating more chicken, fish, beef and other foods rich in high-quality protein, do not stand for a long time, minimize salt intake, and elevate the lower limbs during rest.