The most common clinical cause of smelly discharge after menstruation is bacterial vaginosis caused by bacterial infection due to lack of proper care during menstruation and failure to change sanitary napkins in a timely manner. It is clinically manifested by increased discharge, yellowish color and a strong fishy odor. It is recommended that vaginal plugging of metronidazole suppositories should be used for one week. The symptoms will basically disappear. During menstruation, it is recommended to strengthen local care, change sanitary napkins regularly and wash the vulva with water 1-2 times a day to ensure local cleanliness and reduce the inflammation of the vagina caused by pathogenic bacteria. If the vaginal discharge still smells bad after the above treatment, a detailed examination is recommended to rule out the possibility of localized cervical lesions and endometrial lesions.