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 know for sure. When symptoms do appear, they typically show up 5 to 14 days after exposure, though some people don’t notice anything for several weeks.
Symptoms in Women
When chlamydia does cause symptoms in women, the signs are easy to confuse with a urinary tract infection or a minor vaginal issue. Painful or burning urination is one of the most common early signs. You might also notice unusual vaginal discharge, pain in the lower abdomen or lower back, bleeding between periods, or pain during sex.
Because these symptoms overlap so heavily with other conditions, many women who do experience them don’t connect them to chlamydia. A change in vaginal discharge paired with pelvic pain or painful urination, especially after a new sexual partner, is worth getting tested for.
Symptoms in Men
Men are slightly more likely to notice symptoms than women, but half still won’t. The most common signs include a burning sensation during urination, discharge from the penis, and pain or swelling in one or both testicles. Discharge can range from clear and watery to slightly cloudy. Testicle pain without an obvious injury is a particularly telling sign and shouldn’t be ignored.
Rectal and Throat Infections
Chlamydia can also infect the rectum and throat through oral or anal sex. Rectal chlamydia may cause pain, discharge, or bleeding from the rectum, though it’s frequently silent. Throat infections are almost always asymptomatic, occasionally causing a mild sore throat that most people wouldn’t think twice about. Standard genital tests won’t catch these infections, so if you’ve had oral or anal sex, let your provider know so they can test the right sites.
How Chlamydia Differs From Gonorrhea
Chlamydia and gonorrhea cause nearly identical symptoms, which is why clinics routinely test for both at the same time. Gonorrhea tends to produce symptoms faster and more noticeably. In men, gonorrhea symptoms often appear within five days of exposure, while chlamydia takes closer to one to two weeks. Gonorrhea is also more likely to cause heavier, more obvious discharge. But the overlap is too significant to distinguish between them based on symptoms alone. Gonorrhea can additionally cause eye pain, sensitivity to light, joint swelling, and throat soreness, symptoms less typical of chlamydia.
When and How to Get Tested
Chlamydia can typically be detected within a few days to a couple of weeks after exposure. If you think you were exposed, waiting at least five to seven days before testing reduces the chance of a false negative while the bacteria establish themselves. Testing too early may miss the infection.
The standard test uses a urine sample or a swab. For women, a vaginal swab is more accurate than a urine test, catching about 94% of infections compared to 87% with urine. You can often collect the vaginal swab yourself at the clinic. For men, a urine sample is the standard approach. Results usually come back within one to five days depending on the lab.
The U.S. Preventive Services Task Force recommends routine chlamydia screening for all sexually active women age 24 and younger, regardless of symptoms. Women 25 and older should be screened if they have risk factors like a new sexual partner, more than one partner, inconsistent condom use, or a partner who has an STI or is having sex with other people. There’s no formal screening recommendation for men yet, but testing makes sense for anyone with symptoms, a known exposure, or multiple partners.
What Happens If It Goes Untreated
Because chlamydia so often flies under the radar, untreated infections can quietly cause damage over months. In women, 10 to 15% of untreated chlamydia infections progress to pelvic inflammatory disease, an infection of the uterus, fallopian tubes, or ovaries. PID can cause chronic pelvic pain and scarring that leads to difficulty getting pregnant or increases the risk of ectopic pregnancy. The longer the infection goes untreated, the higher the risk.
In men, untreated chlamydia can spread to the tube that carries sperm, causing pain and swelling. In rare cases this can affect fertility. Both men and women can develop reactive arthritis, where the immune system’s response to the infection triggers joint pain, eye inflammation, and urinary symptoms that linger even after the bacteria are gone.
The Bottom Line on Knowing
Symptoms are an unreliable indicator. The majority of chlamydia infections produce no noticeable signs, and when symptoms do appear, they mimic other common conditions. If you’ve had unprotected sex with a new partner, if a partner tells you they tested positive, or if you’re a sexually active woman under 25, testing is the straightforward answer. A single urine sample or swab can give you a clear result within days, and chlamydia is curable with a short course of antibiotics.