The IUD is an intrauterine device (IUD), which is worn by women to provide good contraception. IUD is a common means of contraception, which is a device placed in the uterine cavity of a woman to prevent the fertilized egg from implanting in the uterus to achieve the purpose of contraception. IUD does not inhibit ovulation, does not affect the female endocrine system, and can effectively avoid the adverse effects caused by medication. This contraceptive measure is safe and effective, with a high contraceptive rate, and the fertility function can be restored after the IUD is removed. Placing the IUD is the main contraceptive measure for women in their reproductive years. Inflammation of the reproductive organs, a uterine cavity that is too large, and irregular vaginal bleeding are not suitable for the use of the IUD and require a change in contraceptive method. Increased leukorrhea may occur when the IUD is placed, which usually does not require special treatment and will resolve on its own after a few months. Any other abnormalities should be treated by a doctor.