Menstrual blood that has just come out of the body is usually uncontaminated and free of bacteria. Menstrual blood is the blood that flows from the uterus. Normal menstrual blood is usually dark red in color, starts off light, gradually deepens, and eventually changes to light red again. Menstrual blood contains not only some blood components, but also components not contained in the blood of the uterus, mainly fragments of the endometrium, cervical mucus, and vaginal epithelial cells, and more importantly, menstrual blood contains a factor that prevents coagulation, so menstrual blood should not be coagulated, and there is no obvious blood clots. The reason why menstruation produces an odor is not because of bacteria, but mainly because of the intermingling of blood, endometrial and sebaceous gland secretions and the smell of sweat, so there is a more obvious odor occurs. The best way to improve this situation is to improve your own hygiene first. If you have any discomfort during your period, it is recommended that you go to the hospital in time for a checkup and follow the doctor’s instructions for treatment.