Many sanitary napkin manufacturers use more adhesive on the back of the sanitary napkin in the production process in order to make the napkin not easy to move, and these adhesives will have a small part of residue on the underwear, if not cleaned up in time will easily cause skin allergy phenomenon. And some sanitary napkins are connected backing, which will increase the contact area of the vulva mouth, and even some sanitary napkins production quality is not qualified, more likely to cause some gynecological diseases. Therefore, it is best not to wear menstrual underwear at ordinary times.