Vaginal itching during menstruation may be caused by allergy to sanitary napkins. You can observe the texture of sanitary napkins and change them to other sanitary napkins to see if the symptoms improve. It may be caused by bacterial infection and poor vaginal hygiene due to not changing the sanitary napkin in time. You should change the sanitary napkin regularly to keep the vaginal area dry and clean. Allergy-induced vaginal itching may have symptoms such as redness around the vagina. Other causes may be gynecological inflammation, such as bacterial vaginitis and candida infection. It may also be caused by endocrine disorders and hormonal disorders in the body, which lead to a decrease in the defenses and resistance of the reproductive system, resulting in the body being susceptible to bacterial infections, which can trigger vaginal itching during menstruation.