Chlamydia almost never clears on its own, and you shouldn't count on it. The infection can linger silently for months or years while quietly damaging the reproductive tract. A short antibiotic course cures it, so test and treat rather than wait it out.
| Item | Reported cases |
|---|---|
| Chlamydia | 1,648,568 |
| Gonorrhea | 601,319 |
| Syphilis (P&S) | 53,007 |
That second link broke — let me put the real ones where they belong below. Assume it stays until antibiotics clear it, and book a test if you've been exposed.
What chlamydia actually is
Chlamydia is an infection caused by the bacterium Chlamydia trachomatis; most US genital cases come from serovars D through K CDC. It's the most commonly reported bacterial STI in the country — about 1.65 million cases in 2023, a rate of roughly 492 per 100,000, and the number has stayed roughly flat across 2020–2023 CDC AtlasPlus, 2023. The burden falls unevenly. Washington DC reports about 1,228 per 100,000, with Louisiana (792) and Mississippi (701) more than double the national rate.
Symptoms — and the silent reality
Most people feel nothing. Roughly three quarters of infected women and half of infected men have no symptoms at all, so you often don't know it's there to begin with.
When symptoms do show, they usually appear within one to three weeks of exposure:
- Women may notice abnormal vaginal discharge or burning on urination; if the infection spreads upward, lower abdominal or low-back pain, fever, pain during sex, and bleeding between periods can follow.
- Men may have penile discharge (often clear or cloudy, sometimes just a drop in the morning), burning on urination, burning or itching at the tip, and occasionally testicular pain or swelling.
- Rectal infection can cause rectal pain, discharge, or bleeding, though it's frequently silent.
- Throat (pharyngeal) infections are typically asymptomatic.
How chlamydia spreads
Chlamydia passes through vaginal, anal, or oral sex. A pregnant woman can also pass it to her baby during childbirth — more on that under. Because so many infections are silent, people commonly transmit it without realizing they're carrying it.
How it's tested
A nucleic acid amplification test (NAAT) is the recommended method for both genital and extragenital infection CDC STI Treatment Guidelines, 2021. Samples can come from first-catch urine, or vaginal, endocervical, urethral, rectal, and pharyngeal swabs. In practice that means a urine cup (hold your urine for about an hour first) or a self-collected swab — no blood draw and no dreaded urethral swab — with results often texted back in one to three days.
People often test the morning after a hookup. A NAAT is most reliable around two weeks out, so an early negative can mislead you; see the guidance on when to test after exposure. The USPSTF (Sept 14, 2021, Grade B) recommends screening all sexually active women 24 or younger and women 25+ at increased risk, including during pregnancy; for men the evidence is insufficient (an I-statement), largely because the complication burden falls on women USPSTF, 2021. The CDC adds at least annual screening for sexually active MSM at every site of exposure, every three to six months for those at higher risk, and HIV testing for everyone diagnosed.
Testing is cheap and easy to reach: it's free or low-cost at Planned Parenthood, health departments, and Title X clinics, often $0 with insurance, and at-home kits run about $50–150. You can get tested today, and it's worth a look to compare testing providers on price and turnaround. For the full walkthrough, see chlamydia testing & diagnosis.
Treatment: yes, it's curable
Antibiotics cure chlamydia. The preferred regimen is doxycycline 100 mg by mouth twice daily for seven days CDC. Alternatives include azithromycin 1 g as a single dose, or levofloxacin 500 mg once daily for seven days. In pregnancy, azithromycin 1 g single dose is preferred, with amoxicillin 500 mg three times daily for seven days as an alternative.
Azithromycin was downgraded from co-equal status because microbiologic treatment failure in men ran higher than with doxycycline, and doxycycline clears rectal infection far better — one randomized trial found 100% cure with doxycycline versus 74% with single-dose azithromycin rectal chlamydia RCT. Take doxycycline with food and stay out of strong sun, since it can make you burn more easily.
| Regimen | Dose | Best use |
|---|---|---|
| Doxycycline (preferred) | 100 mg twice daily × 7 days | First-line; superior for rectal infection |
| Azithromycin | 1 g single dose | Alternative; preferred in pregnancy |
| Levofloxacin | 500 mg once daily × 7 days | Alternative |
| Amoxicillin | 500 mg three times daily × 7 days | Pregnancy alternative |
Get partners from the prior 60 days tested, treated, or presumptively treated, and abstain from sex for seven days after single-dose therapy or until the full seven-day course is done — otherwise you risk "ping-pong" reinfection. Treating partners measurably works: in a landmark trial, giving patients medication to deliver to partners (expedited partner therapy, or EPT) cut persistent or repeat infection Golden et al., NEJM. EPT is permitted in most but not all US states, so verify your local status, and note that many states let you notify partners anonymously.
Put a 3-month retest on your calendar to catch reinfection. That isn't a test-of-cure, and a test-of-cure isn't advised for non-pregnant people unless adherence is in question, symptoms persist, or reinfection is suspected. Pregnant people should have a test-of-cure about four weeks after finishing and retest at three months. The complete recovery picture lives in chlamydia treatment.
What happens if you leave it untreated
"Wait and see" backfires here. Untreated chlamydia can climb the reproductive tract and cause lasting harm.
- In women: pelvic inflammatory disease (PID, infection of the upper reproductive organs), fallopian-tube scarring, ectopic pregnancy (a pregnancy outside the uterus, which can be life-threatening), infertility, and chronic pelvic pain.
- In men: epididymitis (inflammation of the coiled tube behind the testicle, causing pain and fever; rarely sterility).
- Reactive arthritis (joint inflammation, formerly called Reiter syndrome) can follow infection.
- In newborns exposed during birth, chlamydia is a leading cause of early infant pneumonia and conjunctivitis (eye inflammation).
- It may also increase the risk of acquiring or transmitting HIV.
A note on LGV
Lymphogranuloma venereum (LGV) is caused by more invasive C. trachomatis serovars L1, L2, and L3, with the highest burden among MSM; it usually shows up as proctocolitis — mucoid or bloody rectal discharge, anal pain, and tenesmus (a constant urge to pass stool) CDC LGV guidance. LGV needs a longer course: doxycycline 100 mg twice daily for 21 days, with partners from the prior 60 days getting presumptive doxycycline 100 mg twice daily for seven days.
Prevention
Condoms used correctly every time lower your risk, as does a long-term mutually monogamous relationship with a tested partner. But because most infections are silent, routine screening and treating partners do the heavy lifting in cutting transmission. For eligible people — MSM and transgender women who've had a bacterial STI in the past 12 months — DoxyPEP is an option: a single 200 mg dose of doxycycline within 72 hours of sex reduces chlamydia by more than 70% CDC DoxyPEP, 2024.
When to see a clinician
See a clinician if you have symptoms, a partner tests positive, or you're simply due for screening based on the guidance above. Pregnant people should be tested as part of routine prenatal care. Testing positive is routine and curable. Clinics handle it every day.