Under normal circumstances, the discharge should not exceed 20 days, and on the 20th day the discharge should be colorless, transparent and water-like. If there is still bloody nightmare after 20 days, it is considered to be caused by incomplete contraction of the uterus or residual material in the uterine cavity, and it is best to have an ultrasound examination to determine this. If it is determined that there is residual material in the uterine cavity and the amount is not large, you can take motherwort pellets or new biochemical pellets, which are traditional Chinese medicine preparations that can promote uterine contraction, activate blood circulation and remove blood stasis to promote the discharge of material in the uterine cavity. If there is more malodorous fluid and odor, it is considered to be caused by inflammation of the uterine cavity and needs to be treated with anti-inflammatory drugs.