About half of men with chlamydia have no symptoms at all, which means the infection often goes undetected without testing. When symptoms do appear, they typically show up one to three weeks after exposure, though in some cases it can take several months.
Symptoms to Watch For
The most recognizable sign of chlamydia in men is an unusual discharge from the penis. This may be watery, cloudy, or slightly thick, and it can appear on its own or be most noticeable in the morning. The other hallmark symptom is a burning sensation when you urinate, which can range from mild irritation to sharp discomfort.
Less commonly, chlamydia causes pain or swelling in one or both testicles. This happens when the infection spreads to the epididymis, the coiled tube behind each testicle that stores sperm. If you notice testicular swelling alongside any urinary symptoms, that combination strongly suggests an infection that needs treatment.
Chlamydia can also infect the rectum and throat, depending on the type of sexual contact involved. A rectal infection may cause pain, discharge, or bleeding, while a throat infection rarely produces noticeable symptoms.
Why Testing Is the Only Reliable Answer
Since half of infected men never develop symptoms, the absence of discharge or burning doesn’t mean you’re in the clear. Many men unknowingly carry and transmit the infection for months. If you’ve had unprotected sex with a new partner, or a partner has tested positive, testing is the only way to know your status for sure.
The standard test is a urine-based screening that detects the bacteria’s genetic material. It’s simple: you provide a urine sample at a clinic or doctor’s office. There are two things to keep in mind for accuracy. First, you should avoid urinating for about two hours before the test. Second, the sample needs to be “first-catch,” meaning the initial stream of urine rather than midstream. These steps help ensure enough bacterial material ends up in the sample.
If you’ve had rectal or oral exposure, a swab of the throat or rectum may be used instead of, or in addition to, a urine test.
When to Get Tested After Exposure
Timing matters. Testing too early after a potential exposure can produce a false negative because the bacteria haven’t multiplied enough to be detected. One week after exposure is sufficient to catch most infections. Waiting two weeks catches nearly all of them. If you test at one week and get a negative result but still have concerns, a follow-up test at two weeks provides strong reassurance.
If symptoms appear before the one-week mark, go ahead and get tested. A symptomatic infection usually means the bacterial load is already high enough for detection.
What Happens if Chlamydia Goes Untreated
Chlamydia is easily curable with antibiotics, and treatment is straightforward. Left untreated, though, the infection can cause real problems. The primary risk for men is epididymitis, a painful infection in the testicles that causes swelling, tenderness, and sometimes fever. In rare cases, untreated epididymitis can lead to infertility.
There’s also the issue of unknowing transmission. Because so many cases are asymptomatic, an untreated infection can spread to sexual partners over weeks or months. This is especially consequential for female partners, who face a higher risk of serious complications including pelvic inflammatory disease and fertility problems.
Getting Partners Treated
If you test positive, any recent sexual partners need treatment too, even if they feel fine. Reinfection is common when one partner is treated and the other isn’t. The most straightforward approach is for your partner to visit a clinic for their own test and treatment.
When that’s not practical, many states allow something called expedited partner therapy. Your healthcare provider can write a prescription for your partner without examining them first. You bring the medication to your partner directly. This option exists specifically because traditional partner referral often doesn’t work in practice, and reinfection rates stay high when partners aren’t treated promptly. Not every state permits this approach, so your provider can tell you whether it’s available where you live.
Who Should Screen Routinely
Routine screening is recommended for sexually active men who have sex with men, at least once a year. For heterosexual men, routine screening isn’t universally recommended, but it’s worth requesting a test any time you have a new partner, notice any genital symptoms, or learn that a partner has tested positive. Many sexual health clinics include chlamydia in standard STI panels, making it easy to test for multiple infections at once.
After completing treatment, a follow-up test about three months later confirms the infection is gone and checks for reinfection, which is more common than most people expect.