Whether postpartum hemorrhage requires hysterectomy primarily depends on the severity of the hemorrhage and the specific causes of the postpartum hemorrhage. First, if the amount of postpartum hemorrhage is very substantial, leading to conditions like DIC in the pregnant woman, and if not removing the uterus may cause ongoing bleeding, it is essential to remove the uterus quickly to reduce vaginal bleeding. Second, if the postpartum hemorrhage is caused by issues like amniotic fluid embolism or poor contraction of the uterus, and conservative treatments are ineffective, it is also necessary to make a prompt decision to remove the uterus.