Swelling in early pregnancy is mostly a physiological phenomenon, can be due to the rise in estrogen levels during pregnancy caused by sodium retention in the body. In addition, some diseases can also lead to early pregnancy edema, such as malnutrition caused by hypoproteinemia, hypothyroidism, etc.: I. Physiological factors: 1, hormonal changes: during pregnancy, the body’s secretion of estrogen, aldosterone increase, resulting in sodium retention can cause edema; 2, long standing and lying down: pregnant women stand for a long time, lying down for a long time, etc., will make the blood circulation is not smooth and manifested as edema; 3, uterine compression: the gradual increase of the uterus will compress the blood vessels from the heart through the pelvis to the legs. Uterine compression: the gradual increase of the uterus will compress the blood vessels from the heart through the pelvis to the legs, when the blood and lymph circulation is poor, poor metabolism, the leg tissue and body fluids, ankles, knees and hands, etc. can appear obvious edema; in short, physiological edema will not cause adverse effects on the mother and baby, mostly in the postpartum period, no need to worry. Pathological factors: such as malnutrition, pregnancy with hypertension, hypothyroidism, heart disease or other liver diseases, pathological edema will occur. Edema can be seen in the lower limbs, hands, face, abdomen and other places, and when you press the skin with your hand, it will show the phenomenon of sinking, no elasticity, dark blue skin color, etc. This kind of patients should be under the guidance of the doctor for the treatment of the original disease.