Postpartum hemorrhage refers to the condition where, within 24 hours after vaginal delivery, the amount of blood loss reaches 500 milliliters, and in the case of a cesarean section, the blood loss amounts to 1000 milliliters. During this time, the woman may experience a substantial amount of bleeding from the vagina, along with large blood clots. The primary cause of this condition is often significantly associated with poor contraction of the uterine muscles. Post-delivery, the blood sinuses in the uterine muscle layer are open, requiring the uterus to contract. If the contractions are inadequate, it may lead to bleeding from these blood sinuses. Additionally, bleeding could also potentially stem from post-surgical wounds, such as those from a cesarean section or wounds from vaginal delivery.