The effect of the IUD in the treatment of endometrial polyps is good, because the IUD contains highly effective progesterone, which can counteract estrogen when it is inserted into the uterine cavity, thus thinning the endometrium and preventing its recurrence due to the hyperplasia of the endometrium caused by estrogen stimulation, which can lead to the formation of endometrial polyps. In addition, the IUD can also treat excessive menstruation and the corresponding clinical symptoms due to simple hyperplasia of the endometrium, both of which can be treated with the IUD. However, the IUD is only valid for 5 years, so if you need to continue treatment or contraception after the expiration date, you can change to a new IUD for the next treatment, and you may experience a significant decrease in menstruation or even amenorrhea after the IUD.