Most people with chlamydia don’t know they have it. About 75% of women and 50% of men with chlamydia experience no symptoms at all, which is why testing is the only reliable way to find out. If you do develop symptoms, they typically appear one to three weeks after exposure, but some people don’t notice anything for months.
Symptoms in Women
When chlamydia does cause symptoms in women, they’re often mild enough to dismiss as something else. The most common sign is an abnormal vaginal discharge, which may look different from your usual discharge or have an unusual smell. Burning or pain when you pee is another frequent symptom. You might also notice bleeding between periods or after sex, which happens because the infection irritates the cervix.
If the infection spreads deeper into the reproductive tract, it can cause pelvic inflammatory disease (PID), which brings more noticeable symptoms: persistent lower abdominal or pelvic pain, pain during sex, and sometimes fever. PID is a serious complication that can lead to long-term pelvic pain and fertility problems if it isn’t treated.
Symptoms in Men
Men who do get symptoms usually notice them at the tip of the penis first. The most common signs are a discharge from the penis (often clear or cloudy), burning or pain during urination, and redness, swelling, or itching around the urethral opening. Some men develop swelling and tenderness in one or both testicles, which signals the infection has spread and needs prompt treatment.
These symptoms can range from barely noticeable to hard to ignore. A mild, intermittent burning when you pee is easy to write off, which is one reason infections go undiagnosed for weeks or months.
Rectal and Throat Infections
Chlamydia can also infect the rectum and throat, depending on the type of sexual contact involved. Rectal chlamydia may cause pain, discharge, or bleeding from the rectum, but it’s frequently silent. Throat infections are even less likely to produce symptoms. Because these infections don’t show up on a standard urine or genital test, you need to be tested at the specific site of exposure to catch them.
Why You Can’t Rely on Symptoms Alone
The high rate of asymptomatic infection is what makes chlamydia so widespread. You can carry and transmit the bacteria for months without any sign that something is wrong. Partners can pass it back and forth without either person realizing it. The symptoms that do appear, like discharge or mild burning, overlap with several other conditions, including urinary tract infections, yeast infections, and other STIs. The only way to confirm chlamydia is a lab test.
How Chlamydia Testing Works
The standard test uses a technology called nucleic acid amplification, which detects the genetic material of the bacteria. It’s highly accurate: sensitivity is usually well above 90%, and specificity is above 99%, meaning false positives are extremely rare.
For women, a vaginal swab is the most accurate sample type. You can collect this yourself. Urine testing is also an option, though it may detect up to 10% fewer infections compared to a vaginal swab. For men, a urine sample works well and is the standard approach.
If you’ve had oral or anal sex, let your provider know. Rectal and throat swabs are available and use the same accurate testing technology, with detection rates above 90% for rectal samples. These sites won’t be tested unless you specifically ask or disclose your sexual history.
At-home test kits are another option. These involve collecting your own sample (usually a swab or urine) and mailing it to a lab. Experts consider them comparably accurate to tests done in a clinic, and they remove the barrier of scheduling an appointment.
Who Should Get Tested Regularly
Because symptoms are unreliable, the CDC recommends routine screening for several groups even when they feel perfectly fine:
- Sexually active women under 25: Annual testing is recommended regardless of risk factors.
- Women 25 and older: Annual testing if you have a new partner, multiple partners, a partner with other partners, inconsistent condom use outside a monogamous relationship, or a previous STI.
- Pregnant women under 25: Testing at the first prenatal visit, with a retest in the third trimester.
- Men who have sex with men: At least annual testing at all sites of contact (urethra, rectum), regardless of condom use. Every 3 to 6 months if on PrEP, living with HIV, or if you or your partners have multiple partners.
- People living with HIV: Testing at the first HIV evaluation and at least annually after that.
- Transgender and gender diverse people: Screening based on anatomy. Anyone with a cervix under 25 should be screened annually, and those over 25 should be screened if risk factors are present.
There’s no routine screening recommendation for heterosexual men at low risk, though testing is still appropriate in high-prevalence settings like STI clinics or if a partner tests positive.
After a Positive Result
Chlamydia is curable with antibiotics, and treatment is straightforward. After finishing your medication, you should be retested about three months later. Reinfection is common, often because a partner wasn’t treated at the same time. Any recent sexual partners need to be notified and treated as well to break the cycle of transmission.
Pregnant women who test positive should have a follow-up test four weeks after completing treatment to confirm the infection has cleared, plus another retest within three months.
What Happens If It Goes Untreated
Left alone, chlamydia doesn’t resolve on its own and can cause lasting damage. In women, the biggest risk is pelvic inflammatory disease, which can scar the fallopian tubes and lead to chronic pelvic pain, ectopic pregnancy, or infertility. In men, untreated infection can spread to the epididymis (the tube behind the testicle), causing pain and, in rare cases, affecting fertility. These complications develop silently over time, which is why routine screening matters so much for people in higher-risk groups.