Pelvic inflammatory disease (PID) happens when bacteria, most often from untreated chlamydia or gonorrhea, travel up from the cervix into the uterus, fallopian tubes, and ovaries. Caught early, it is treatable with antibiotics. Missed or treated late, it scars the tubes and becomes one of the most common preventable causes of infertility, ectopic pregnancy, and chronic pelvic pain. About 4.4% of U.S. women aged 18 to 44 who have ever been sexually active report a lifetime PID diagnosis, roughly 2.5 million women, and the burden falls hardest on Black women.
What PID is and what causes it
PID is an ascending infection. Bacteria that start as a lower-tract sexually transmitted infection move upward into the uterus, fallopian tubes, and surrounding tissue. Chlamydia and gonorrhea cause most cases, but other organisms, including bacteria tied to bacterial vaginosis, can be involved. PID can also follow procedures that breach the cervix, such as an IUD insertion, an endometrial biopsy, or a miscarriage or abortion, though the risk from these is low. The infection inflames and scars the tubes. That scarring is what causes the long-term damage.
The chlamydia link matters because chlamydia is frequently silent. Up to 70% of women with chlamydia have no symptoms, so the infection can ascend and damage the tubes before anyone knows it is there. This is why screening, not just treating symptoms, is the core of prevention.
Why Black women carry more of the burden
Black women report PID at roughly twice the rate of white women. In a CDC analysis of national survey data, lifetime PID prevalence among Black women was 2.2 times that among white women when neither group had a prior STI diagnosis (6.0% versus 2.7%). A separate analysis of national data found self-reported PID was significantly lower among white women than non-Hispanic Black women after adjustment.
The gap follows the STI gap, and the STI gap is structural. In 2023, non-Hispanic Black people accounted for 32.4% of reported chlamydia, gonorrhea, and primary and secondary syphilis cases while making up 12.6% of the population. The CDC is explicit that these differences are not explained by sexual behavior. They reflect differential access to quality sexual health care, the makeup of local sexual networks, and the downstream effects of poverty, stigma, racism, and gaps in insurance and screening. In a community where infection is already more common, every encounter carries a higher chance of exposure regardless of how anyone behaves.
Two more factors compound it. Partner treatment often falls through, so a treated woman gets reinfected by an untreated partner. And bias in clinical settings means Black women's pelvic pain is more likely to be dismissed or attributed to something else, which delays the diagnosis until damage is done.
Symptoms, and why PID gets missed
PID symptoms range from severe to none. When they appear, watch for:
- Lower-abdominal or pelvic pain, often dull and on both sides
- Unusual or heavier vaginal discharge, sometimes with an odor
- Pain during sex
- Bleeding between periods or after sex
- Fever or chills
- Pain or burning with urination
The danger is that PID can be subclinical, meaning the infection inflames and scars the tubes with mild or no symptoms at all. Subclinical PID has been documented in a meaningful share of women with chlamydia, and it still damages fertility. Because the early signs overlap with a urinary tract infection, a yeast infection, or ordinary menstrual cramps, many cases get attributed to something benign and treated late. There is no single definitive test, so a clinician has to keep PID on the table when a sexually active woman reports pelvic pain. If you have read about a yeast infection or a urinary tract infection and the pain is in your lower belly rather than only when you urinate, ask specifically whether PID has been ruled out.
What happens if PID is not treated
Each episode raises the odds of lasting harm. Scarring in the fallopian tubes can block them, which causes tubal-factor infertility. Studies estimate 15 to 19% of women with PID develop tubal-factor infertility, and the risk climbs with repeat episodes. A partially blocked tube can trap a fertilized egg, producing an ectopic pregnancy that can rupture the tube and cause life-threatening internal bleeding. Some women develop a tubo-ovarian abscess, a pocket of pus that can require hospital care or surgery. Others are left with chronic pelvic pain that lasts months or years. The longer treatment is delayed, the higher every one of these risks.
How PID is diagnosed and treated
Diagnosis is mostly clinical. A clinician does a pelvic exam looking for tenderness of the cervix, uterus, or ovaries, and tests for chlamydia and gonorrhea. The CDC advises starting empiric treatment in a sexually active woman with pelvic pain and exam tenderness if no other cause explains it, because waiting for confirmation costs tubes. An ultrasound can find an abscess, and in unclear cases laparoscopy can confirm the diagnosis directly.
Treatment is prompt antibiotics. The CDC's 2021 regimen for outpatient PID combines ceftriaxone, doxycycline, and metronidazole. Most women are treated as outpatients; severe cases, pregnancy, abscess, or failure to improve warrant hospital care and IV antibiotics. Two parts of treatment are non-negotiable. First, sexual partners from the prior 60 days need testing and presumptive treatment for chlamydia and gonorrhea, or reinfection undoes the work. Second, follow up: you should feel better within 72 hours, and if you do not, you need to be re-evaluated.
How to prevent PID
Prevention is screening plus prompt treatment. The U.S. Preventive Services Task Force recommends that all sexually active women 24 or younger, and women 25 or older at increased risk, be screened for chlamydia and gonorrhea, whether or not they have symptoms. Screening and treating these infections directly lowers PID risk. Condoms reduce transmission. If you test positive, finish the antibiotics, make sure your partner is treated, and retest in about three months because reinfection is common. If a new IUD or a recent procedure is followed by pelvic pain and fever, get evaluated rather than assuming it will settle.
How to get care
If you have pelvic pain or a positive STI test, you need a clinician who takes it seriously the first time. A provider who knows the disparity data and does not minimize Black women's pain shortens the path to treatment and protects your fertility. You can find a Black or Black-serving clinician in the directory and bring one direct question to the visit: ask whether PID has been ruled out, and ask to be screened for chlamydia and gonorrhea by name. Routine annual screening when you are under 25 is the single most effective thing you can do.
Frequently asked questions
Can you have PID without any symptoms? ▼
Yes. PID can be subclinical, meaning it inflames and scars the fallopian tubes with mild or no symptoms. Because chlamydia is often silent, the infection can ascend and damage fertility before you notice anything. This is why routine screening matters more than waiting for symptoms.
Does PID make you infertile? ▼
It can. PID is a leading preventable cause of infertility because tubal scarring blocks the path between egg and sperm. Roughly 15 to 19% of women with PID develop tubal-factor infertility, and the risk rises with each repeat episode. Prompt antibiotics greatly lower that risk, which is why early treatment matters.
Why are Black women more likely to get PID? ▼
Black women report PID at about twice the rate of white women, tracking the higher STI burden in the population. The CDC is clear this reflects structural factors: unequal access to sexual health care, sexual-network effects, poverty, stigma, and racism, plus gaps in partner treatment and bias that delays diagnosis. It is not a statement about behavior.
Do my partners need treatment if I have PID? ▼
Yes. Sexual partners from the 60 days before your symptoms started should be tested and presumptively treated for chlamydia and gonorrhea, even if they have no symptoms. If a partner is not treated, you can get reinfected and the cycle of tube damage continues.
How is PID treated? ▼
With prompt antibiotics. The CDC's outpatient regimen combines ceftriaxone, doxycycline, and metronidazole. Most women are treated at home; severe cases, abscess, or pregnancy need hospital IV antibiotics. You should feel better within 72 hours. If not, get re-evaluated.
How can I prevent PID? ▼
Get screened. If you are a sexually active woman 24 or younger, the USPSTF recommends annual chlamydia and gonorrhea screening even without symptoms. Use condoms, treat any positive test fully, make sure partners are treated, and retest in about three months.