The IUD for women is usually a birth control ring that prevents the fertilized egg from implanting, and its dangers and side effects include infection, bleeding, and pregnancy with the ring. The IUD is one of the more commonly used intrauterine devices, and can be very effective in preventing pregnancy. 1. Infection: The IUD will increase the possibility of inflammatory infections, such as endometritis and vaginitis, to a certain extent. 2. Bleeding: because of the need to put the birth control ring in the body, the body will be due to the entry of foreign objects by a strong stimulus, and then the endometrial compression or cell damage, resulting in abnormal bleeding symptoms. 3. Pregnancy with an IUD: Although the IUD can play a good role in contraception, it is not a complete guarantee of contraception and may cause ectopic pregnancy or uterine perforation and other serious effects. Women should choose whether or not to have an IUD under the guidance of a doctor, and need to consult a doctor in time if they have any uncomfortable symptoms.