Causes of swollen vulva in pregnant women: a. If the entire vulva area is edematous, this condition is caused by local obstruction of blood circulation and tissue fluid return. It may be caused by the enlargement of the abdomen too significantly in late pregnancy, which compresses the inferior vena cava and obstructs the blood circulation in the lower limbs and vulva area. Pregnant women should rest in bed more often and elevate the lower limbs during rest to promote blood circulation. Second, if severe edema occurs from the neck to the vulva area, you should be highly alert to the possibility of hypertensive disorders of pregnancy. Pregnant women need to visit the obstetrics department of a public hospital as soon as possible to measure blood pressure, laboratory tests for urine routine and kidney function, etc., to clarify the diagnosis and provide timely treatment. If the swelling is confined to the vulva with obvious pain, it may be caused by inflammation of the vestibular gland or inflammation of the hair follicles in the vulva, and should be treated according to medical advice after a clear diagnosis.