An IUD is a small, T-shaped plastic device that
is wrapped in copper or contains hormones. The IUD is inserted into your
uterus by your doctor. A plastic string tied to the
end of the IUD hangs down through the
cervix into the
vagina. You can check that the IUD is in place by
feeling for this string. The string is also used by your doctor to remove the
Both IUD types may prevent fertilization or implantation.
You can have an IUD inserted at any
time, as long as you are not pregnant and you don't have a pelvic infection. An IUD is inserted into your uterus by
your doctor. The
insertion procedure takes only a few minutes and can
be done in a doctor's office. Sometimes a
local anesthetic is injected into the area around the
cervix, but this is not always needed.
IUD insertion is easiest in
women who have had a vaginal childbirth in the past.
may have you feel for the IUD string right after insertion, to be sure you know
what it feels like.
You may want to have someone drive you
home after the insertion procedure. You may experience some mild cramping and
light bleeding (spotting) for 1 or 2 days.
Do not have sex, use tampons, or put anything in your vagina for the first 24 hours after you have an IUD inserted.footnote 1
Your doctor may want to see you 4 to 6
weeks after the IUD insertion, to make sure it is in place.
A string tied to the end of the IUD hangs down through
the opening of the uterus (called the cervix) into the vagina. You can check
that the IUD is in place by feeling for the string. The IUD usually stays in
the uterus until your doctor removes it.
If you cannot feel the string, it
doesn't necessarily mean that the IUD has been expelled. Sometimes the string
is just difficult to feel or has been pulled up into the cervical canal (which
will not harm you). An exam and sometimes an
ultrasound will show whether the IUD is still in
place. Use another form of birth control until your doctor makes sure that the
IUD is still in place.
You may be a good candidate for an IUD
The copper IUD is recommended for
emergency contraception if you have had unprotected
sex in the past few days and need to avoid pregnancy and
you plan to continue using the IUD for birth control. As a short-term type of
emergency contraception, the copper IUD is more expensive than emergency
contraception with hormone pills.
The IUD is a highly effective method
of birth control.
Advantages of IUDs include cost-effectiveness over time,
ease of use, lower risk of
ectopic pregnancy, and no interruption of foreplay or
the hormonal IUD:
Risks of using an intrauterine device (IUD)
Disadvantages of IUDs include the high cost of insertion,
no protection against STIs, and the need to be removed by a doctor.
The hormonal IUD may cause
noncancerous (benign) growths called
ovarian cysts, which usually go away on their
The hormonal IUD can cause hormonal side effects similar to those
caused by oral contraceptives, such as breast tenderness, mood swings,
headaches, and acne. This is rare. When side effects do happen, they usually go
away after the first few months.
If you become pregnant with an IUD in place, your doctor will recommend
that the IUD be removed. This is because the IUD can cause
preterm birth (the IUD will not cause birth defects).
When using an IUD, be
aware of warning signs of a more serious problem related to the IUD.
Call your doctor now or seek immediate medical care if:
Watch closely for changes in your health, and be sure to contact your doctor if:
Pelvic inflammatory disease (PID) concerns have been
linked to the IUD for years. But it is now known that the IUD itself does not
cause PID. Instead, if you have a genital infection when an IUD is inserted,
the infection can be carried into your uterus and fallopian tubes. If you are
at risk for a
sexually transmitted infection (STI), your doctor will
test you and treat you if necessary, before you get an IUD.
Intrauterine devices reduce the risk of all pregnancies, including
ectopic (tubal) pregnancy. But if a pregnancy does
occur while an IUD is in place, it is a little more likely that the pregnancy
will be ectopic. Ectopic pregnancies require medicine or surgery to remove the
pregnancy. Sometimes the fallopian tube on that side must be removed as
An IUD can be a
safe birth control choice for women who:footnote 6
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CitationsDean G, Schwarz EB (2011). Intrauterine contraceptives (IUCs). In RA Hatcher et al., eds., Contraceptive Technology, revised 20th ed., pp. 147-191. New York: Ardent Media.Trussell J, Guthrie KA (2011). Choosing a contraceptive: Efficacy, safety, and personal considerations. In RA Hatcher et al., eds., Contraceptive Technology, 20th ed., pp. 45-74. Atlanta: Ardent Media. Grimes DA (2007). Intrauterine devices (IUDs). In RA Hatcher et al., eds., Contraceptive Technology, 19th ed., pp. 117-143. New York: Ardent Media.Fritz MA, Speroff L (2011). Endometriosis. In Clinical Gynecologic Endocrinology and Infertility, 8th ed., pp. 1221-1248. Philadelphia: Lippincott Williams and Wilkins.American College of Obstetricians and Gynecologists (2011, reaffirmed 2015). Long-acting reversible contraception: Implants and intrauterine devices. ACOG Practice Bulletin No. 121. Obstetrics and Gynecology, 118(1): 184-196. Accessed March 28, 2017.Speroff L, Darney PD (2011). Intrauterine contraception. In A Clinical Guide for Contraception, 5th ed., pp. 239-279. Philadelphia: Lippincott Williams and Wilkins.
ByHealthwise StaffPrimary Medical ReviewerSarah Marshall, MD - Family MedicineKathleen Romito, MD - Family MedicineAdam Husney, MD - Family MedicineElizabeth T. Russo, MD - Internal MedicineSpecialist Medical ReviewerRebecca Sue Uranga, MD - Obstetrics and Gynecology
Current as ofJune 6, 2017
Current as of:
June 6, 2017
Sarah Marshall, MD - Family Medicine & Kathleen Romito, MD - Family Medicine & Adam Husney, MD - Family Medicine & Elizabeth T. Russo, MD - Internal Medicine & Rebecca Sue Uranga, MD - Obstetrics and Gynecology
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Last modified on: 8 September 2017