During the menstruation, it is normal to smell a metallic odor. This is because of the iron content in the blood. Frequent changes of sanitary pads or tampons and daily washing of the genital area are recommended to prevent unpleasant odors. During the menstruation, it is normal to smell a metallic odor. This is because of the iron content in the blood. Frequent changes of sanitary pads or tampons and daily washing of the genital area are recommended to prevent unpleasant odors.