This document defines and describes postpartum hemorrhage (PPH). PPH is bleeding after childbirth within 24 hours (primary) or anytime after 24 hours (secondary). Primary PPH is blood loss over 500ml vaginally or 1000ml for c-section. The main causes are atonic PPH from the uterus failing to contract (90% of cases), traumatic due to birth injuries, coagulopathy, and retained placenta. Risk factors include prior PPH, macrosomia, and prolonged labor. Prevention focuses on risk assessment, monitoring for complete placenta removal, and having protocols for rapid response to hemorrhage. Secondary PPH can be caused by infection, retained fragments, or uterine inc