There are many reasons for vulvar swelling in pregnancy, including physiological reasons, infection, tumor, mechanical stimulation, allergic reaction, systemic diseases, etc. The causes of this situation should be clarified and dealt with accordingly. Common causes and treatment I. Non-disease factors 1. Physiological changes during pregnancy: the increase of the uterus will compress the local venous plexus of the vulva, which will obstruct the venous return and cause vulvar swelling, and this discomfort will disappear after pregnancy. The need to replace the cotton, loose underwear. 1. Infection: Bacteria, fungi, trichomonas, etc. attack the vulva and vagina, causing inflammatory lesions, which need to be treated by doctors according to the specific pathogens. Doctors should evaluate the symptoms of pregnant women to decide their mode of delivery; 3. Allergic reactions: daily application of detergents or contact with certain allergenic substances, eating certain allergenic foods, etc. cause local skin metaplasia in the vulva or systemic metaplasia involving the vulva, resulting in vulvar redness and swelling, which should be sought and allergens should be found and avoided in the future living environment; 4. Systemic diseases: such as Diabetes, chronic discoid lupus erythematosus, varicose veins, etc. can cause vulvar swelling, which requires medical consultation and systematic examination to confirm the diagnosis and treat the primary disease. Precautions 1, more bed rest, reduce the pressure of standing activities; 2, can be padded pillow under the buttocks, elevated hip rest; 3, itching to avoid scratching, daily wash with warm water, with ulcers can use a soft sterile perineal pad.