During menstruation, women’s lower body is bleeding continuously, blood is a good bacterial culture medium, the resistance and immunity of women’s body is poor during this period, if the vulva is not clean, change underwear and sanitary napkin is not diligent may cause bacterial infection, women will have vaginal itching. Itching can occur during menstruation. 2. Wearing tight underwear of chemical fiber and not paying attention to the hygiene and cleanliness of the vulva during menstruation may also cause itching due to poor ventilation and sweltering humidity of sanitary napkins used during menstruation. 3. cause vaginitis or upstream infection, etc., and itchy performance. During menstruation, you should pay attention to the hygiene and cleanliness of the vulva. Before pathogenic infections are detected, you do not need to use drugs to clean the vulva, but only warm boiled water. When using sanitary napkins, if the amount of menstrual blood is high, you need to change them in time. It is recommended not to wear tight fitting underwear of chemical fiber type. After active treatment, if the symptoms do not improve, you can promptly go to a regular hospital for further examination to clarify the cause and treatment.