Most people with chlamydia don’t know they have it. Between 70% and 80% of women and up to 50% of men with the infection experience no symptoms at all. That means the most reliable way to know if you have chlamydia isn’t watching for signs, it’s getting tested.
When symptoms do appear, they typically show up several weeks after exposure. But because so many infections are silent, understanding both the possible symptoms and when to get screened is essential.
Symptoms in Women
When chlamydia does cause symptoms in women, they’re often mild enough to dismiss as something else. The most common signs include unusual vaginal discharge, a burning feeling when you urinate, and bleeding between periods. Pain during sex and bleeding afterward can also occur. Lower abdominal pain, while less common early on, may signal that the infection is spreading deeper into the reproductive tract.
The trouble is that these symptoms overlap with yeast infections, urinary tract infections, and hormonal changes. Many women attribute them to something routine and don’t seek testing. If you notice any combination of unusual discharge, urinary discomfort, or irregular bleeding after unprotected sex, a chlamydia test is a straightforward next step.
Symptoms in Men
Men are somewhat more likely to notice symptoms than women, though up to half of male infections are still silent. The hallmark signs are discharge from the penis, burning or pain during urination, and swelling or tenderness in one or both testicles. The discharge is often clear or whitish rather than thick, which can make it easy to overlook.
Testicular pain or swelling without an obvious injury is a particularly important signal. It may indicate that the infection has reached the epididymis, the coiled tube behind each testicle where sperm matures. Left untreated, this can become quite painful and, in rare cases, affect fertility.
Rectal and Throat Infections
Chlamydia can also infect the rectum and throat through oral or anal sex. These infections are especially likely to be silent. Rectal chlamydia may cause mild discomfort, discharge, or bleeding from the rectum, but many people feel nothing at all. Throat infections are almost always symptom-free.
Because these infections don’t produce obvious signs, they’re easy to miss unless you specifically request testing at those sites. Standard urine tests won’t detect chlamydia in the throat or rectum. If you’ve had oral or receptive anal sex, let your provider know so they can swab the right locations.
When Symptoms Appear
If you’re going to develop symptoms, expect them to show up several weeks after the sexual contact that transmitted the infection. This delay is one reason chlamydia spreads so effectively. You can transmit the bacteria to a partner long before you notice anything wrong, and you may never notice anything at all.
The incubation period also means that symptoms appearing just a day or two after sex are unlikely to be chlamydia. They’re more likely related to a different infection or irritation.
How Testing Works
The standard chlamydia test uses a urine sample or a swab (vaginal, rectal, or throat, depending on the site of potential exposure). The test detects the bacteria’s genetic material, making it highly accurate. For women, vaginal swabs are slightly more sensitive than urine samples, catching about 94% of infections compared to 87% for urine. Both are still considered reliable, and many clinics offer the choice.
Timing matters. Testing too soon after exposure can produce a false negative. Most infections are detectable within one week, but waiting two weeks after exposure catches nearly all cases. If you test negative within the first week but still have concerns, a repeat test at the two-week mark provides more certainty.
Self-Collected and At-Home Tests
You don’t necessarily need a clinician to collect your sample. Research comparing self-collected swabs to provider-collected swabs found strong agreement between the two, with 95% concordance for rectal chlamydia results. In some cases, self-collected samples actually caught more positives than provider-collected ones. At-home collection kits that you mail to a lab use the same technology as in-office tests, so their accuracy is comparable as long as you follow the instructions.
Who Should Get Screened Routinely
Because chlamydia is so often symptom-free, the CDC recommends routine screening for several groups regardless of whether they feel fine. Sexually active women under 25 should be screened annually. Women 25 and older should be screened if they have a new partner, multiple partners, a partner who has other partners, or inconsistent condom use outside a mutually monogamous relationship.
Men who have sex with men should be screened at least once a year at all sites of contact, whether or not they use condoms. Those on PrEP, living with HIV, or with multiple partners should consider screening every three to six months. For transgender and gender diverse individuals, screening recommendations follow anatomy: anyone with a cervix who is under 25, or over 25 with risk factors, should be screened annually.
There isn’t a strong recommendation for routine screening in heterosexual men at low risk, though clinics that serve younger populations or high-prevalence settings often screen them too.
What Happens If It Goes Undetected
Untreated chlamydia can progress silently into more serious problems. In women, the biggest concern is pelvic inflammatory disease (PID), an infection of the uterus, fallopian tubes, or ovaries. PID symptoms include lower abdominal pain, fever, foul-smelling discharge, pain or bleeding during sex, burning urination, and bleeding between periods. Some women with PID still have mild or no symptoms, which is why it sometimes goes undiagnosed until it has already caused scarring in the fallopian tubes. That scarring can lead to chronic pelvic pain, ectopic pregnancy, or difficulty getting pregnant.
In men, untreated infection can cause epididymitis, leading to pain, swelling, and in some cases fertility problems. In anyone, untreated chlamydia also increases susceptibility to other sexually transmitted infections.
After a Positive Result
Chlamydia is curable with antibiotics, and treatment is straightforward. After finishing treatment, 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, even if they have no symptoms, to break the cycle of transmission.
If you’re pregnant and test positive, treatment is the same, but your provider will likely confirm the infection has cleared with a follow-up test four weeks after treatment and screen again in the third trimester.