If your period has a bad odor, consider the presence of inflammation or pathological conditions, under normal circumstances, menstruation will have a faint fishy odor. If the menstrual period has a fishy or rotten egg odor, consider the possibility of endometritis or endometrial pathology, you need to wait for the end of menstruation to go to the hospital to do the appropriate gynecological examination, and if necessary, pelvic ultrasonography, to understand the thickness of the uterine lining and whether the endometrium is homogeneous echogenicity. If the results of the examination are abnormal, it is recommended to do diagnostic scraping within 6-12 hours of the next menstrual period and send it for pathologic examination to clarify the diagnosis. In addition, if there is bacterial vaginitis, trichomonas vaginitis or mycosis vaginitis, inflammatory lesions of the cervix, there will also be odor during menstruation, etc. The specific cause of the disease is still to go to the hospital as soon as possible to consult, clarify the diagnosis and then treat it at the earliest possible time.