Itching of the vulva during menstruation may have the following clinical causes: first, due to allergy to sanitary napkins, it is recommended to change to another brand of sanitary napkins and then observe if itching occurs again. The second one may be caused by the accumulation of menstrual blood on the sanitary napkin due to the lack of diligent change of sanitary napkin, which causes local inflammatory reaction and makes the vulva itchy. It is advisable to keep the vulva clean, change the sanitary napkin regularly, and wash the vulva with warm water 1-2 times a day, and apply mometasone ointment to stop itching if it is itchy. Thirdly, because the vagina itself is inflamed. When the secretions flow out together with menstrual blood, it will stimulate the vulva and cause itching. It is advisable to go to the hospital after menstruation to check the white belt routine and give treatment according to the result.