Center for Young Women's Health

Intra-Uterine Devices (IUDs)



  • IUDs are more than 99% effective against pregnancy for 5-10 years.
  • A health care provider must insert an IUD into a woman's uterus.
  • IUDs do NOT protect against STDs.

What are intra-uterine devices (IUDs)?

An intra-uterine device is a special device that fits inside of the uterus to prevent pregnancy. There is more than one kind of IUD. One type contains the hormone levonorgestrel. When this IUD is in place, the hormone is continuously released into the uterus. Another type of IUD is covered with copper. The copper IUD has copper wire coiled around the stem and arms of the device. Both are about 1¼ inches tall. Each IUD has a string attached to the end, so you can check to make sure the IUD is in place. The string also makes it easier for your health care provider to remove it when it's time to take it out. The IUD is inserted into your uterus through your vagina and protects against pregnancy.


Out of 100 women using IUDs and IUSs
Typical use: 1 or less women become pregnant icon representing less than 1 pregnant woman
Perfect use: 1 or less women become pregnant icon representing less than 1 pregnant woman

Copper T-380 IUD, Levonorgestrel IUS


Where can I get the IUD?

You must get an IUD from a health care provider (HCP). Your HCP will likely schedule the insertion of the IUD at the time of your period. Once the IUD has been inserted, it stays in your uterus and protects against pregnancy until your HCP removes it.


The cost of the IUD and the exam varies. It's a good idea to check with your insurance provider to find out if you have to pay for the IUD, exam and the insertion of it or if it will be partially or fully covered by your health insurance plan.


How does my health care provider insert the IUD?

Insertion of an IUD takes only about 5 to 10 minutes. Your health care provider (HCP) will first do a pelvic exam to measure the size, shape, and position of your uterus and other reproductive organs. Then an antiseptic solution is gently applied to your cervix. The IUD will be inserted up through the opening of your cervix into your uterus using a special applicator that keeps the IUD flat and closed until it is at the top of your uterus. You will likely feel cramping. Your HCP will then cut the string at the end of the IUD so that it is short enough so it won't bother you or partner. It will be long enough so you can check to make sure that the IUD is in place.


Do I need to do anything after the IUD has been inserted?

Yes. At the end of each monthly menstrual period and any time you feel strange cramping during your period, you should check for the string inside of your vagina. Do this by inserting a clean finger in your vagina all the way to your cervix. Your health care provider will explain to you how to check for the string and may show you with a mirror what it looks like. The IUD's string feels like a lightweight plastic thread or a fishing line. It should hang about 2 inches down from your cervix into your vagina. If you can't feel the string or if you feel the IUD itself, the IUD is probably not in the right place. If you ever think the IUD is not in the right place, you need to use a backup method of birth control if you have sexual intercourse and call your health care provider. Make sure to schedule a check-up about a month after the IUD has been inserted to make sure it is still in the right place. After this exam, you should get regular check-ups every year.


How does an IUD prevent pregnancy?

An IUD prevents pregnancy by acting like a spermicide, stopping or killing sperm, by thickening the mucus in the cervix, and by changing the menstrual cycle.


When does the IUD start protecting against pregnancy?

The IUD starts protecting against pregnancy right after your health care provider inserts it.


How effective is the IUD against pregnancy?

IUDs are more than 99% effective. This means that if 100 women use the copper IUD or the levonorgestrel IUS, less than 1 woman will become pregnant in a year.


Does the IUD protect against sexually transmitted infections?

The IUD does not protect you from sexually transmitted infections. The IUD is best used by women who are in a steady relationship with one partner and are unlikely to get a sexually transmitted infection. Condoms should be used to protect against sexually transmitted infections.


Can I feel the IUD?

No. Neither you nor your partner can feel the IUD. If you do, call your health care provider, because the IUD is out of place. However, you will be able to feel the string attached to the end of the IUD when you check for it monthly. During sexual intercourse, your partner may feel the string.


Can I do normal activities after the IUD has been inserted?

Yes. After the IUD is in place in your uterus, you can swim, exercise, use tampons, and have sex as soon as you want to.


Are there side effects of the IUD?

There are some side effects with the IUD, but not many. You may have uterine cramps (like menstrual cramps) or a low backache when the IUD is inserted, and maybe for a few weeks after insertion. With the levonorgestrel IUD you will likely have much lighter periods or none at all. With the copper IUD, you may have increased menstrual flow and cramps, but this usually lessens after the first few months, as your uterus gets used to the IUD. You can take over-the-counter medicine, such as acetaminophen (Tylenol®), ibuprofen (Advil®, Motrin®, and Nuprin®), or naproxen sodium (Aleve®). Some women have spotting or bleeding between menstrual periods with the IUD.


There is a slightly increased risk of infection, called pelvic inflammatory disease (PID) during the first 20 days after the IUD is inserted. After that, the risk for PID is very low. Very rarely, the uterus can be injured when the IUD is inserted.


You should not use an IUD if you:

Tell your health care provider if you recently had a baby or are breast feeding, if you have high blood pressure, diabetes and/or severe migraines, or if you were born with heart disease or have problems with your heart valves.


When should I get the IUD removed?

It depends on the kind of IUD you have. The newest IUD, the levonorgestrel IUD, can stay in your uterus for up to 5 years. Copper IUDs can stay in your uterus for up to 10 years. You can get the IUD removed by your health care provider at any time. A new IUD can be inserted at the time of the removal. As soon as the IUD is removed, you can get pregnant. You'll need to use another form of contraception right away if you don't want to become pregnant.


What if I have problems with the IUD?

If you have any problems with the IUD, call your health care provider. You definitely need to get in touch with your health care provider if:

What if I get pregnant when the IUD is inside of me?

Your risk for getting pregnant after the IUD has been inserted is very low. However, there is always a slight chance that you can get pregnant, since the IUD is not 100% effective. If you do get pregnant while the IUD is in place, you'll need to see your health care provider (HCP) right away. If the pregnancy is not in the uterus (ectopic pregnancy), it's an emergency and surgery will likely be needed. If pregnancy occurs in the uterus, your HCP will talk to you about the benefits and the risks of removing the IUD.


The IUD is one of the safest and most effective methods of contraception available today. It's recommended for young women and adult women who are not at risk of getting a sexually transmitted infection and who have only one sexual partner. Although women who have had children are more likely to choose this method, IUDs can be used by women who have not had children. Ask your health care provider if an IUD would be a good birth control method for you.


Written and reviewed by the CYWH Staff at Boston Children's Hospital


Updated: 8/2/2012


Related Guides:


Did you know that about 800,000 teen girls become pregnant in the United States each year, and more than 80% of these pregnancies are unplanned? Dealing with a pregnancy is one of the most important decisions a teen may need to make...


Making Healthy Sexual Decisions

As a young adult, it's normal to think about sex, have sexual feelings, and have a desire to learn more about your own body. Deciding to have a sexual relationship is an important decision since it involves both your body and your emotions. You need to make sure that it is the right decision for you...

Search Our Site
Center for Young Women's Health Center for Young Women's Health Boston Children's Hospital Boston Children's Hospital
Photo of Peer Leaders Meet Our Peers
15 Years!