Enlargement of the labia in late pregnancy may be caused by physiological factors or pathologic factors, such as hypertensive disorders in pregnancy and inflammatory vulvar diseases. 1. Physiologically, in late pregnancy, due to the growing fetus, the uterus enlarges, which can compress the inferior vena cava, affecting the venous blood return of the perineum and lower limbs, resulting in excessive blood storage in the venous blood vessels, resulting in the performance of edema of the perineum and lower limbs, and there is no need for any special treatment for the labia enlargement in late pregnancy caused by this condition. 2. Pathological conditions, such as pregnant women suffering from gestational hypertension, can lead to impaired kidney function, a large amount of protein from the urine, the protein content in the blood is too low, which can cause generalized edema in pregnant women, but also showed late pregnancy labia enlargement; part of the pregnant women vulvar inflammation can stimulate the vulvar skin red and swollen, but also late pregnancy labia enlargement performance. When pregnant women appear labia enlargement performance should be timely to seek medical attention to clarify the cause of the disease, if necessary, early treatment, so as not to delay the condition lead to adverse consequences.