The sexually transmitted infections most likely to cause pelvic pain in women are chlamydia and gonorrhea — usually because they've spread upward and triggered pelvic inflammatory disease (PID), an infection of the uterus, fallopian tubes, and ovaries. But pelvic pain isn't always an STI: ovarian cysts, endometriosis, and urinary infections cause it too, so a test is what settles the question.
deep pelvic pain and fever (a complication)
often silent; discharge or burning if anything
discharge and burning; can also hit throat/rectum
| Item | Value |
|---|---|
| Pelvic inflammatory disease (PID) | curable — deep pelvic pain and fever (a complication) |
| Chlamydia | curable — often silent; discharge or burning if anything |
| Gonorrhea | curable — discharge and burning; can also hit throat/rectum |
Which STIs cause pelvic pain in women?
Most STI-related pelvic pain traces back to one chain of events: a lower-genital infection (the cervix) goes untreated, the bacteria climb into the upper reproductive tract, and the resulting inflammation is what you feel as aching, cramping, or deep pelvic pressure. The two bacteria behind most of these cases are chlamydia and gonorrhea. The pain itself is usually the sign that PID has already started.
Pelvic inflammatory disease (PID)
PID is an infection of the upper female reproductive organs — the uterus, fallopian tubes, and ovaries — and it's most often a complication of an untreated STI like chlamydia or gonorrhea that's spread from the cervix CDC, About PID. The tell-tale pattern is lower-abdominal or pelvic pain, often with unusual discharge that smells bad, fever, pain or bleeding during sex, burning when you urinate, or bleeding between periods. Here's the trap: symptoms are frequently mild or absent, so many women don't realize anything is wrong until scar tissue has already formed in the tubes.
That silent progression is why PID matters so much. Inflammation in the fallopian tubes can leave behind scarring that partially or fully blocks them — which is how PID drives up the risk of infertility and of ectopic pregnancy (a pregnancy implanted in the tube instead of the uterus, which is a medical emergency). The longer an infection goes untreated before pain appears, the more damage may already be done, which is the case for screening before you ever feel anything.
Chlamydia
Chlamydia is caused by the bacterium Chlamydia trachomatis, and it's the classic 'silent' infection — roughly three quarters of infected women have no symptoms at all CDC Chlamydia Fact Sheet. When symptoms do show up, they usually appear within one to three weeks of exposure and start small: abnormal vaginal discharge and burning when you urinate. Pelvic pain is a later, more ominous sign. Once the infection spreads upward, women may notice lower-abdominal or low-back pain, fever, pain during intercourse, and bleeding between periods — the same cluster that defines PID.
Because so many cases are symptom-free, reinfection is common — a treated woman whose untreated partner gives it back is a frequent scenario. If you've been treated, follow the guidance on chlamydia reinfection and get retested, since a repeat infection restarts the same risk to your tubes.
Gonorrhea
Gonorrhea is caused by Neisseria gonorrhoeae, which can infect the genitals, rectum, and throat CDC, About Gonorrhea. In women, most infections cause no symptoms; when they do, the pattern is painful or burning urination, increased vaginal discharge, and bleeding between periods. As with chlamydia, the appearance of pelvic pain usually signals that the infection has moved into the upper tract and tipped into PID. Gonorrhea and chlamydia often travel together, which is one reason testing usually checks for both at once.
When pelvic pain is NOT an STI
Plenty of pelvic pain has nothing to do with an infection you caught from a partner. Common non-STI causes include:
- Ovarian cysts — fluid-filled sacs on the ovary that can cause one-sided, sharp or dull pelvic pain, often around ovulation; most resolve on their own.
- Endometriosis — tissue similar to the uterine lining growing outside the uterus, which typically causes cyclical pain that's worst around your period and can also make sex painful.
- Urinary tract infections (UTIs) — bladder infections that cause burning urination and lower-pelvic or suprapubic pressure, sometimes mistaken for an STI because the burning overlaps.
The honest takeaway: these conditions overlap with STIs too much to separate by symptoms alone, and several are frequently silent. That's exactly why you usually can't self-diagnose pelvic pain — a test, not the symptom, is what tells you which one (if any) it actually is.
How to tell them apart
There are clues a clinician weighs, even though none is definitive on its own. STI-driven PID tends to come with foul-smelling discharge, fever, pain or bleeding with sex, and bleeding between periods — and crucially, with cervical-motion, uterine, or adnexal tenderness on exam (pain when the cervix or the area around the tubes and ovaries is moved or pressed). Endometriosis pain usually tracks your menstrual cycle. A UTI leans toward urinary burning and urgency without abnormal vaginal discharge. Ovarian-cyst pain is often sudden and one-sided.
For PID specifically, the CDC tells clinicians to keep a low threshold to treat: begin presumptive treatment when there's pelvic or lower-abdominal pain with no other explanation, plus at least one of cervical-motion, uterine, or adnexal tenderness CDC PID Guidelines, 2021. There's no single confirmatory blood test for PID — it's a clinical diagnosis, which means waiting for a 'positive result' to act could cost you tube damage.
Side-by-side comparison
| Cause | Typical pain pattern | Other clues | Often silent? |
|---|---|---|---|
| PID (from STI) | Lower-abdominal/pelvic, may be mild | Bad-smelling discharge, fever, pain/bleeding with sex, tenderness on exam | Yes — often mild or absent |
| Chlamydia | Lower-abdomen/low-back if it spreads | Abnormal discharge, burning urination; symptoms ~1–3 weeks after exposure | Yes — most women have none |
| Gonorrhea | Lower-abdomen if it spreads to PID | Painful urination, increased discharge, bleeding between periods | Yes — most women have none |
| Ovarian cyst | Often sudden, one-sided | May flare around ovulation; usually no discharge | Sometimes |
| Endometriosis | Cyclical, worst with periods | Painful sex, heavy periods | No |
| UTI | Lower-pelvic/bladder pressure | Burning urination, urgency; no vaginal discharge | Sometimes |
How it's tested
For chlamydia and gonorrhea, a nucleic acid amplification test (NAAT) is the recommended method — it detects bacterial genetic material from a urine sample or a swab, and for gonorrhea the test is highly accurate CDC STI Treatment Guidelines, 2021. In practice, testing is a urine sample, a self-collected swab, or a quick exam depending on what's suspected, and it's free or low-cost at health departments, Planned Parenthood, and Title X clinics, with results usually back in a few days. You can read the full how-to and get tested, and if you're timing things after a recent risk, see when to test after exposure. The mechanics of a gonorrhea test are covered separately.
What to do next
If you have pelvic pain plus any of the warning signs above, don't wait it out — get evaluated. Chlamydia and gonorrhea are both curable with antibiotics, and PID is treated with a course of antibiotics started promptly to protect your fertility. Your partner needs treatment too, or you'll just pass it back and forth. The full regimen and what recovery looks like are covered in pid treatment.
Red flags — when to get seen urgently
Some symptoms shouldn't wait for an appointment. Seek same-day or emergency care if you have:
- Severe lower-abdominal or pelvic pain, especially if it's sudden or one-sided.
- Fever with pelvic pain, which can point to active PID or a pelvic abscess.
- Pain with a positive or possible pregnancy — sudden one-sided pain in pregnancy can mean an ectopic pregnancy, which is life-threatening.
- Fainting, dizziness, or vomiting along with pelvic pain.
- Heavy or abnormal vaginal bleeding with pain.