Etiology/Cause: uterine atony, placental fragments preventing effective contraction, small retained placental fragment, mild endometritis, uterine myoma, grand multiparity, overdistension of uterus, ill maternal health, caesarean section, uterine prolapse, uterine fibroid, persistent lochia/fresh bleeding, long labor, precipitate labor, anesthesia, full bladder, difficult delivery, retained placenta, maternal infection/uterine sepsis