<prompt> Most common cause of secondary postpaum hemorrhage:-TraumaAtonic uterusBleeding disordersRetained products of conception  <response>: Most common cause of secondary postpaum hemorrhage is retained tissues Secondary postpaum hemorrhage is bleeding 24 hours to 12 weeks after delivery. Causes of PPH10 and 20 : Uterine atonicity Injury to any pa of genital tract Coagulopathy von Willebrands disease Retained tissues - MCC of 20PPH 