The IUD is a popular method of birth control that is highly effective and simple to use for a long period of time, but it can also be harmful if not removed. If menstrual disorders occur during prolonged placement of the IUD, the ring may cause inflammation of the endometrium, or the patient may have endometrial lesions and bleeding with prolonged menstrual cycles or excessive menstrual flow, or irregular bleeding with purulent blood. Prompt removal of the ring and, if necessary, diagnostic curettage are required. Back pain. Some women who have chosen to have the IUD placed may experience significant back pain if it is not removed for a long time. Adhesion to the uterine wall. If the IUD is left in place for a long time, there is a risk that it may penetrate the uterus or become directly attached to the uterine wall. If the IUD is left in the uterus for a long period of time beyond the prescribed age, it may cause deformation of the IUD or failure of the birth control function. The IUD can effectively achieve the role of contraception, but in order to ensure the health of middle-aged and elderly women, it must be removed within the specified period of time, so as to avoid more risks.