There are two main hazards of the IUD: first, bleeding after the IUD. Because the IUD is a foreign body to the uterus, there is a process of adaptation, which takes about 3 months, so if there is vaginal bleeding, symptomatic treatment should be given. However, if you do not adapt after 3 months and still have bleeding, you should remove the IUD. Second, infection. The vast majority of the IUDs are not infected, but individual cases due to poor body resistance, coupled with some medical personnel not strictly in accordance with the aseptic operation, or premature sex after the IUD, may lead to intrauterine infection, resulting in symptoms such as endometritis and pelvic inflammatory disease. In addition, in rare cases, such as during breastfeeding, because the uterus is soft, uterine perforation may occur, as well as the displacement of the IUD into the pelvic or abdominal cavity, which is the damage of the IUD.