The vast majority of them start to have double lower extremity edema when they are about six months pregnant. This is mainly because the enlarged uterus compresses the inferior vena cava, which makes the lower limbs reflux poorly, so it causes the edema of the lower limbs. It is recommended that at night when you sleep, it is best to elevate both lower limbs, so as to promote local blood circulation so that the swelling of the lower limbs to relieve the situation, by elevating the lower limbs the next day, the edema will obviously disappear, or there is an improvement in the situation. It is also recommended that in the case of edema during pregnancy, it is important to know whether there is proteinuria, you can do routine urine examination. If there is proteinuria, it is clinically necessary to give some intervention, and also to exclude the possibility of gestational hypertension, it is recommended to measure the blood pressure at each obstetric examination.