Pelvic inflammatory disease (PID) after an intrauterine device (IUD) is uncommon. The small increase in risk is mainly limited to the first three weeks after insertion and is often linked to an infection already present in the cervix, such as chlamydia or gonorrhea. Having an IUD does not usually raise PID risk long term. Screening for sexually transmitted infections and prompt care for concerning symptoms help manage risk.
How much does an IUD increase the risk of PID?
The overall risk of pelvic inflammatory disease after IUD insertion is low. The main concern is the short period immediately after the device is placed, when bacteria may enter the upper reproductive tract during the procedure. According to the Centers for Disease Control and Prevention (CDC), the small increase in PID risk associated with IUD use is largely limited to the first three weeks after insertion.
After this initial period, the additional risk related to insertion generally declines. An IUD is not considered a continuing cause of PID simply because it remains in the uterus. Longer-term infection risk is more closely related to factors such as exposure to sexually transmitted infections (STIs).
This applies to both copper IUDs and hormonal IUDs. Neither type eliminates the possibility of PID, but infection after insertion is uncommon. The important distinction is between a short-term insertion-related risk and an infection that develops because bacteria enter the reproductive tract through other routes.
Why can PID develop after IUD insertion?
Pelvic inflammatory disease is an infection involving the upper reproductive tract, which may include the uterus, fallopian tubes, and nearby structures. It can develop when bacteria travel upward from the vagina or cervix. Sexually transmitted bacteria, particularly those responsible for chlamydia and gonorrhea, are important causes, although other bacteria can also be involved.
IUD insertion involves passing the device through the cervix into the uterus. If an infection is already present, the procedure may contribute to bacteria reaching the upper reproductive tract. This helps explain why the risk is concentrated around the time of insertion rather than continuing at the same level throughout IUD use.
According to the American College of Obstetricians and Gynecologists (ACOG), PID after IUD insertion is rare, and having an IUD does not by itself create an ongoing increased risk of PID. An undiagnosed STI at the time of insertion is an important concern.
Which factors may increase the risk of PID after insertion?
The main concern is whether an infection is present when the IUD is inserted. Relevant factors include:
- An untreated sexually transmitted infection: Chlamydia or gonorrhea involving the cervix can increase the risk of infection spreading into the upper reproductive tract.
- Possible recent exposure to an STI: A new sexual partner, a partner with an STI, or other circumstances involving possible exposure may make screening particularly important.
- An existing infection or inflammation of the cervix: An active infection can affect whether IUD insertion should proceed at that time.
- Delayed assessment of concerning symptoms: If infection develops after insertion, postponing medical evaluation may delay treatment and allow complications to develop.
These factors do not mean that PID will necessarily occur. They help healthcare professionals assess whether STI testing or treatment is needed and whether insertion can safely proceed.
Can an IUD be inserted if STI screening is needed?
In many situations, yes. The CDC's recommendations on intrauterine contraception state that people who need gonorrhea or chlamydia screening can often be tested on the same day as IUD insertion. When indicated screening has not been completed, insertion generally does not need to be delayed while waiting for test results, provided there is no known active infection or purulent cervicitis that makes insertion inappropriate.
There is an important exception. An IUD generally should not be newly inserted when a person has a current diagnosis of gonorrhea or chlamydia or active purulent cervicitis. A healthcare professional can arrange appropriate testing and treatment, then advise when insertion can proceed.
Routine preventive antibiotics solely for IUD insertion are generally not recommended. The CDC reports that preventive antibiotics have not significantly reduced PID rates in studies of IUD placement. Screening when indicated, recognizing an existing infection, and obtaining appropriate treatment are more relevant to managing infection risk.
What symptoms after IUD insertion could indicate an infection?
Some cramping and light bleeding can occur for a few days after insertion. These effects alone do not establish that an infection is present. However, new symptoms, worsening discomfort, or symptoms that seem unusual for the expected recovery period deserve attention.
According to MedlinePlus, PID may cause symptoms such as the following, although some people experience few symptoms or none at all:
- Pain in the lower abdomen or pelvis.
- Fever or chills.
- Unusual vaginal discharge, especially discharge with an unpleasant smell.
- Pain or bleeding during sexual intercourse.
- Bleeding between menstrual periods or bleeding that differs from the usual pattern.
- Pain or discomfort when urinating.
These symptoms can have causes other than PID, and their timing alone cannot confirm an infection. However, pelvic pain accompanied by fever or unusual discharge after IUD insertion warrants prompt medical assessment. Do not wait for every possible symptom to appear before seeking care.
When should you seek medical care after IUD insertion?
Contact a healthcare professional promptly if you develop persistent or worsening lower abdominal pain, fever, unusual or foul-smelling vaginal discharge, or pain during sex following IUD insertion. If the pain is sudden or intense, you have a high temperature, you feel seriously unwell, or you experience very heavy vaginal bleeding, seek urgent medical care.
The UK National Health Service (NHS) advises urgent assessment for concerning symptoms after fitting a hormonal intrauterine system, including lower abdominal pain that worsens or does not go away, fever, and unusual or unpleasant-smelling discharge. Similar warning signs after copper IUD insertion should also be evaluated.
When assessing possible PID, a healthcare professional may review when the IUD was inserted, the pattern of symptoms, sexual and medical history, and any relevant STI exposure. Evaluation may include a pelvic examination, testing for STIs, pregnancy testing when appropriate, and other investigations based on the findings. No single symptom or test result should be interpreted outside its clinical context.
What happens if PID is diagnosed while an IUD is in place?
A diagnosis of PID does not automatically mean that the IUD must be removed. The CDC's PID treatment guidance states that an IUD can generally remain in place when treatment begins, with close clinical follow-up. Appropriate antibiotic treatment is needed, and the healthcare professional should reassess the person's response within 48 to 72 hours.
If symptoms do not improve with treatment, the healthcare professional may consider removing the device. The decision depends on the clinical situation and the person's preferences. Removal should not be attempted at home, and it should not replace appropriate assessment and treatment of the infection.
Early treatment matters because untreated or inadequately treated PID can lead to complications, including scarring of the fallopian tubes, difficulty becoming pregnant, and persistent pelvic pain. Prompt evaluation helps healthcare professionals identify the infection and begin appropriate care.
How can you reduce PID risk when choosing an IUD?
You do not usually need to avoid an IUD because of concern about PID. Instead, discuss any possible STI exposure, previous test results, or current genital symptoms with the healthcare professional providing contraception. Complete recommended STI screening and follow advice about treatment if an infection is identified.
Condoms can help reduce exposure to sexually transmitted infections, although they do not eliminate all STI risk. An IUD prevents pregnancy but does not protect against STIs. If symptoms develop after insertion, seek assessment rather than assuming they are a normal effect of the device.
The key point is that PID after IUD insertion is uncommon, and the added risk is concentrated in the first three weeks. Appropriate screening, avoiding insertion when certain active infections are present, and seeking timely care for concerning symptoms help address the main infection-related concerns without unnecessarily delaying access to effective contraception.