Postpartum hemorrhage is defined as blood loss exceeding 500 mL after vaginal delivery or 1000 mL after cesarean delivery within 24 hours. It occurs in 4% of deliveries and is primarily caused by uterine atony, genital tract trauma, retained placental tissue, and coagulation disorders. Management involves identifying the cause, such as through manual exploration of the uterus, repairing lacerations, administering uterotonic drugs to contract the uterus, and treating underlying coagulation disorders. Surgical interventions like hysterectomy may be needed for severe cases unresponsive to initial treatment measures.