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An IUD is a small plastic and copper device that’s put into your uterus (womb). It has one or two thin threads on the end that hang through your cervix (the entrance to the uterus) into the top of your vagina.
An IUD works for contraception for 5 or 10 years, depending on the type. If you’re aged 40 or older when the IUD is fitted, it will work for contraception until after the menopause, when contraception isn’t needed.
An IUD is sometimes called a ‘coil’ or ‘copper coil’. There are different types and sizes.