Late postpartum hemorrhage refers to a significant amount of vaginal bleeding that occurs two to three weeks after a cesarean section or natural childbirth. The causes of late postpartum hemorrhage include the following aspects. First, the presence of residuals in the uterine cavity, such as when the placenta or membranes remain within the uterine cavity after childbirth, can repeatedly stimulate the endometrium causing bleeding. Second, poor healing of the uterine incision during a cesarean section can lead to post-cesarean bleeding, a condition that easily causes late postpartum hemorrhage. Third, poor healing of episiotomy or perineal laceration wounds after natural childbirth can also potentially lead to late postpartum hemorrhage.