The difference between postpartum hemorrhage and menstruation varies whether it is a vaginal delivery or a cesarean section. The timing of postpartum bleeding varies, and it also relates to postpartum lochia. If the bleeding occurs within 24 hours, it is called severe postpartum hemorrhage; most frequently, we encounter bleeding after 24 hours. Typically, for vaginal deliveries, bleeding occurs within seven days. In cesarean sections, due to the uterine incision, healing is needed, and the duration of bleeding varies by individual and health, commonly lasting from one to two months post-operation. Postpartum bleeding is due to incomplete healing of the uterine lining, which is different from menstrual bleeding. Menstrual bleeding is usually heavier in the initial days and the blood is dark red with a cyclic pattern. In contrast, postpartum bleeding does not have a cyclic nature; it usually consists of fresh red or dark blood, whereas menstrual bleeding typically involves dark blood.