If the IUD is displaced, the following symptoms are likely to occur: 1) irregular vaginal bleeding. 2) lower abdominal pain. 3) changes in menstrual flow. For example, the amount of menstruation may increase because the displaced IUD can affect the contraction of the uterus, which can lead to the opening of the blood sinuses and affect the contraction of the uterus, resulting in excessive menstrual flow. Therefore, if a woman with an IUD has these symptoms, it is recommended that she go to the hospital for an examination to find out the position of the IUD. If the IUD is displaced, it is recommended to replace it with a new one as soon as possible.