Prolonged menstrual period after IUD is mostly due to the ring. The placement of the ring in the uterine cavity can cause local inflammatory reactions, endometrial congestion and edema, so the menstrual period may show more heavy menstrual flow and longer menstrual period. If the ring is displaced, that is to say, the ring has moved down, it will cause the uterus to contract poorly during menstruation, so the menstrual period may also be prolonged. If the period clears within 7 days, you can observe for the time being. If the menstruation is not clean for more than 10 days and continues for 3 months after the IUD is inserted, it is possible that the IUD is not compatible with the insertion, and removal of the IUD may be recommended, and most people’s menstruation will return to normal after 3 months.