Intrauterine Device (IUD) An intrauterine device (IUD) is a
method of birth control that is placed inside the uterus to
prevent pregnancy. It is not clearly understood how the IUD
prevents pregnancy, and different types of IUDs may prevent
pregnancy in different ways. All IUDs have a plastic string that
extends through the opening of the cervix into the vagina. The
string allows a woman to check that the IUD is in place. It also
allows a health professional to remove the device at the woman's
request or at the end of its effectiveness (usually anywhere
from 5 to 10 years, depending on the type). The IUD is very
effective at preventing pregnancy. eMedicineHealth Medical
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