Since the ring is a foreign body in the uterine cavity, it may cause contraction of the uterine lining during coitus, which may result in a small amount of bleeding. It takes time for the IUD to get used to the endometrial pattern, which will reduce the amount of bleeding caused by coitus. Meanwhile, bleeding during intercourse after IUD application does not necessarily have to be caused by the IUD, but also has to be ruled out if there is any disease in the cervix. Bleeding can occur when there is cervical erosion, cervical cysts, or even inflammation of the cervix. As far as possible, we should also observe the situation of the next coitus, if frequent contact bleeding occurs during coitus, if necessary, we need to go to the hospital and register with the gynecology department for colposcopy to rule out cervical abnormalities. If necessary, also do TCT and HPV cancer screening.