There are several reasons for the odor of the lower body during menstruation: First, it may be due to the presence of blood and other secretions inside the menstrual blood, which will lead to the emergence of obvious odor, which belongs to the normal physiological reaction, and can not be treated; Second, if a woman suffers from vaginitis, pelvic inflammatory disease, which will lead to leukorrhoea abnormalities and vulvar odor and other problems, so you need to wait until the end of the menstrual period to go to the hospital for an examination to see Third, it may be caused by eating cold and irritating food or having fire, which may lead to vulvar odor and other symptoms, so you should take more rest and eat light food to avoid fire; fourth, it may be caused by other problems, such as systemic diseases or metabolic abnormalities, endocrine disorders and other problems.