If the IUD is not removed, it may have the following adverse effects on the patient: First, if the IUD is not removed after the expiration date, its contraceptive effect will decrease and the patient may have an unplanned pregnancy. Second, if the IUD remains in the patient’s body after menopause, the patient’s uterus and vagina will shrink as the patient’s hormone levels continue to decline. Second, if the IUD remains in the patient’s body after menopause, as the patient’s hormone level continues to decline, the patient’s uterus and vagina will both atrophy. As a foreign body will stimulate local pain and discomfort, it is recommended that the patient’s IUD be removed in a timely manner when appropriate.