Postpartum hemorrhage refers to bleeding exceeding 800 or 1000 milliliters within a short period after childbirth. It is currently the leading cause of maternal mortality in clinical practice. With the improvement of clinical treatment levels and the enhancement of diagnostic capabilities for postpartum hemorrhage, the vast majority of such cases can be well-managed. The keys to addressing postpartum hemorrhage effectively are early diagnosis and early intervention, which can lead to favorable outcomes. The main causes of postpartum hemorrhage include uterine atony, retained placenta and membranes, injuries to the soft birth canal, and coagulation disorders. When significant postpartum bleeding occurs, it is crucial to carefully investigate these four aspects to identify the cause and intervene accordingly, often leading to successful treatment outcomes.