Because the endometrium is shed along with bleeding from ruptured capillaries and fragments of the shed endometrium are mixed with blood and discharged from the vagina, in most cases, the color of the discharged endometrium is similar to the color of menstrual blood, which is red or dark red. At the end of menstruation, the bleeding from the broken capillaries in the uterine wall will gradually decrease, and the bleeding will basically end in 3-4 days. What is discharged from the vagina is a small amount of blood that remains in the uterine cavity, and so the shed endometrium may have a polypoid color, which is a normal phenomenon. If a woman’s menstrual flow is heavy, or during menstruation due to cold, caused by stagnation of menstrual blood to form blood clots, in this case the shed endometrium may be mixed in the blood clots, it is not easy to be seen, the woman should pay attention to the warmth of menstruation, do not eat spicy, stimulating food.