1. Postpartum hemorrhage is defined as blood loss over 500ml following childbirth and is a leading cause of maternal mortality worldwide.
2. The most common cause is uterine atony, accounting for around 90% of cases. Other causes include retained tissue, trauma, and coagulopathy.
3. Treatment begins with medical management including uterine massage, oxytocics, and bimanual compression. If bleeding continues, further steps may include misoprostol, B-Lynch suture, or ligation of arteries. Hysterectomy is a last resort to control life-threatening bleeding.