Most people with chlamydia don’t know they have it. About 75% of women and 50% of men with the infection have no symptoms at all, which is why testing is the only reliable way to find out. When symptoms do appear, they typically show up several weeks after exposure, though some people carry the infection for months without any sign.
Symptoms in Women
When chlamydia does cause symptoms in women, the most common signs involve changes in vaginal discharge and discomfort during urination. You might notice discharge that looks different from normal, sometimes with an unusual odor. A burning sensation when you pee is another early signal. Spotting between periods or bleeding after sex can also point to an infection.
If the infection spreads to the uterus and fallopian tubes, it can cause pelvic inflammatory disease, or PID. At that stage, symptoms become harder to ignore: pain or tenderness in the lower abdomen that feels like a dull ache, pain deep in the pelvis during sex, and irregular periods or cramping throughout the month. PID-related discharge is often yellow or green with a noticeable odor. Not every chlamydia infection leads to PID, but the risk is real enough that catching the infection early matters.
Symptoms in Men
In men, the most recognizable symptom is discharge from the penis, which is usually clear, watery, or mucus-like rather than thick. A burning sensation when urinating is the other hallmark. Some men also experience pain or swelling in one or both testicles, though this is less common and usually signals the infection has progressed. Because half of men with chlamydia have no symptoms, the absence of discharge or burning doesn’t mean you’re in the clear.
Rectal and Throat Infections
Chlamydia doesn’t only infect the genitals. Anal sex can lead to a rectal infection, which may cause pain, discharge from the rectum, or bleeding. A more aggressive strain (called LGV) can cause severe inflammation in the anorectal area along with abdominal cramps, diarrhea, constipation, and fever. Throat infections from oral sex are possible too, but they almost never cause symptoms, making them essentially invisible without a test.
Why You Can’t Rely on Symptoms Alone
The core problem with chlamydia is that feeling fine doesn’t mean much. The majority of infections are completely silent. Even when symptoms do show up, they’re often mild enough to dismiss as a urinary tract infection or normal variation in discharge. This is exactly why public health guidelines emphasize routine screening rather than symptom-based testing.
In women, asymptomatic infections still carry risks over time. A long-term study following women from 2008 to 2022 found that those who tested positive for chlamydia were about 1.6 times more likely to develop PID, nearly twice as likely to have an ectopic pregnancy, and roughly 2.75 times more likely to experience tubal factor infertility compared to women who never had the infection. Symptomatic infections carried even higher risks: women with symptoms were over four times as likely to develop tubal infertility. The actual rates remained low in absolute terms, but the elevated risk adds up, especially with repeated infections.
How Testing Works
The standard chlamydia test uses a method called nucleic acid amplification, which detects the bacteria’s genetic material. It’s highly accurate and painless. For women, a vaginal swab is the preferred sample type, catching about 94% of infections. A urine test works too, though it picks up roughly 10% fewer cases. For men, a urine sample is the standard approach. If you’ve had anal or oral sex, your provider can swab the rectum or throat separately, since a genital test won’t catch infections at other sites.
Timing matters. If you think you were exposed, wait at least one week before testing. At that point, most infections will be detectable. Waiting two weeks catches nearly all of them. Testing too early after exposure can produce a false negative, giving you a clean result while the bacteria are still establishing the infection.
Who Should Get Tested Routinely
The CDC recommends annual chlamydia screening for all sexually active women under 25, regardless of symptoms or relationship status. Women 25 and older should also be screened if they have risk factors like a new partner, multiple partners, a partner who has other partners, inconsistent condom use, or a previous STI. The same age and risk guidelines apply to anyone with a cervix, including transgender men.
For men who have sex with men, the recommendation is at least annual testing at all sites of sexual contact. Men on PrEP, men with HIV, or those with multiple partners should test every three to six months. For heterosexual men at low risk, there isn’t a blanket screening recommendation, but testing makes sense in certain settings like STI clinics or if a partner tests positive.
All pregnant women under 25 should be tested, along with pregnant women over 25 who have any risk factors. Chlamydia can pass to a baby during delivery and cause eye infections or pneumonia.
What Happens After a Positive Test
Chlamydia is curable with antibiotics, and treatment is straightforward. Most people are prescribed a short course of oral medication. You’ll need to avoid sex for seven days after completing treatment to prevent passing the infection to a partner. Any recent sexual partners should be notified and tested as well, since reinfection from an untreated partner is common.
Retesting three months after treatment is recommended to make sure you haven’t been reinfected. A follow-up test isn’t checking whether the antibiotics worked (they almost always do) but whether you’ve been exposed again in the meantime.