The honest answer is that you probably can’t tell from symptoms alone. About 75% of women and 50% of men with chlamydia have no symptoms at all. The only reliable way to know is to get tested. That said, there are signs that can point toward an infection, and understanding what to look for (and what to do next) can help you act quickly.
Why Most People Don’t Notice Symptoms
Chlamydia is sometimes called a “silent” infection because the majority of people who have it feel completely normal. This is the single most important thing to understand: feeling fine does not mean you’re in the clear. The infection can persist for weeks or months without any noticeable changes, quietly causing damage to your reproductive system the entire time.
This is why routine screening matters so much. If you’ve had unprotected sex or a new partner, the absence of symptoms tells you very little. Testing is the only way to rule it out.
Symptoms in Women
When chlamydia does cause symptoms in women, they tend to be mild and easy to dismiss as something else. The most common signs include an unusual vaginal discharge (different in color, consistency, or smell from what’s normal for you) and a burning sensation when you pee. Some women also notice bleeding between periods or pain during sex.
If the infection has spread to the uterus or fallopian tubes, you may feel deeper pelvic or lower abdominal pain. This can signal pelvic inflammatory disease, a more serious complication. At that point the infection has been present for a while and is actively causing internal inflammation.
Symptoms in Men
Men are slightly more likely to notice something is off, though half still have no symptoms. The telltale signs are a clear or mucus-like discharge from the penis and a burning or stinging feeling when urinating. These symptoms can be mild enough to ignore, especially if the discharge is small in amount.
Less commonly, the infection can spread to the testicles, causing pain, swelling, and tenderness on one or both sides. This is called epididymitis and typically means the infection has gone untreated for some time.
Symptoms at Other Body Sites
Chlamydia doesn’t only infect the genitals. If you’ve had oral or anal sex, the infection can develop in the throat or rectum. Rectal chlamydia may cause discharge, pain, or bleeding from the anus. Throat infections rarely produce noticeable symptoms at all. These infections won’t show up on a standard urine test, so it’s important to tell your provider about all types of sexual contact so the right areas get tested.
When Symptoms Appear
If you do develop symptoms, they typically show up within one to three weeks after exposure. But because most infections stay silent, the window between exposure and discovery often stretches much longer. Many people only find out through a routine screening or after a partner tells them they’ve tested positive.
How Testing Works
Chlamydia testing is simple and highly accurate. The standard test, called a nucleic acid amplification test, detects the bacteria’s genetic material with a sensitivity above 90% and a specificity of 99% or higher. In practical terms, that means false results are rare.
For most people, the test involves either a urine sample or a swab. Women may provide a vaginal swab (which you can often collect yourself in the exam room), while men typically give a urine sample. If you’ve had receptive anal or oral sex, your provider can swab those areas specifically. Rectal swab testing picks up about 93% of infections at that site, so it’s worth requesting if it applies to you.
At-home test kits are also available and use the same lab technology. The tests themselves are reliable, but there’s a catch: accuracy depends on collecting a good sample. In a clinical setting, providers know exactly how to get an adequate swab. At home, there’s more room for error, which can occasionally lead to a missed infection. If you go the at-home route, follow the collection instructions carefully.
Who Should Get Screened Regularly
The CDC recommends annual chlamydia screening for all sexually active women under 25, regardless of symptoms or perceived risk. Women 25 and older should be screened yearly if they have a new partner, more than one partner, a partner who has other partners, or a partner with a known STI. The same guidelines apply during pregnancy.
For men who have sex with men, annual screening is recommended at all sites of sexual contact, with more frequent testing (every three to six months) for those on PrEP, living with HIV, or who have multiple partners. For heterosexual men, there isn’t a blanket screening recommendation, but testing is encouraged in higher-risk settings like STI clinics or correctional facilities.
Transgender and gender diverse individuals should be screened based on their anatomy. Anyone with a cervix who is under 25 and sexually active qualifies for routine annual screening under current guidelines.
What Happens If It Goes Untreated
Chlamydia is easily curable with antibiotics, but the damage from a long-standing untreated infection is not always reversible. In women, the biggest risk is pelvic inflammatory disease, which can scar the fallopian tubes and lead to chronic pelvic pain, difficulty getting pregnant, or ectopic pregnancy (a dangerous condition where a fertilized egg implants outside the uterus). In men, untreated chlamydia can cause a painful infection in the testicles that, in rare cases, also affects fertility.
Chlamydia also increases your susceptibility to HIV if you’re exposed, and during pregnancy it raises the risk of premature delivery and low birth weight. A baby born to someone with an active infection can develop eye infections or pneumonia. In uncommon cases, chlamydia triggers reactive arthritis, causing joint swelling and eye inflammation that can persist even after the infection itself is treated.
None of these complications are inevitable, but they underscore why waiting for symptoms is not a safe strategy. A simple test and a short course of treatment can prevent all of them.