The IUD is a more common contraceptive for women and a safer and more effective one. The IUD is a foreign body to the uterus and the uterus may react with rejection. So after IUD, there will be a small amount of vaginal bleeding, which usually lasts about 1 week and is not much, less than the amount of menstruation. You should pay attention to the following points: 1. The best time for IUD is within 3-7 days after menstruation, and vaginal discharge examination should be performed before the operation to exclude vaginitis; 2. Avoid holding your breath as much as possible to prevent the ring from falling off due to the sudden increase of abdominal pressure; 4. Avoid sex and bathing for 2 weeks; 5. A small amount of vaginal bleeding, back pain and lower abdominal distension after IUD is normal, most of them do not need to be treated and can be relieved slowly. If the symptoms are serious, such as vaginal bleeding exceeding the amount of menstruation, it should be treated promptly. If there is no obvious effect of medication and the bleeding is heavy, you can consider taking out the IUD temporarily and reapply it after the physical condition is improved; 6. Therefore, it is necessary to follow up regularly within 1 year after the IUD.