Up to 50% of men with chlamydia have no symptoms at all, which makes this one of the trickiest infections to catch without testing. If you do develop symptoms, they typically appear within one to three weeks after exposure, though some men notice nothing for much longer. The only reliable way to know for sure is a simple urine test.
Symptoms to Watch For
When chlamydia does cause symptoms in men, it almost always starts with urethritis, which is inflammation of the tube that carries urine out of the penis. The most common signs are discharge from the penis and a burning sensation when you urinate. The discharge can range from barely noticeable (a small amount of clear fluid) to more obvious and yellowish. Sometimes the only symptom is mild itching or irritation at the tip of the penis.
These symptoms can be easy to dismiss. A small amount of clear discharge might not seem alarming, and mild burning during urination often gets chalked up to dehydration or a urinary tract issue. That’s part of why chlamydia spreads so effectively. If you’re noticing anything unusual, even something subtle, it’s worth getting tested rather than waiting to see if it gets worse.
Chlamydia vs. Gonorrhea Symptoms
Chlamydia and gonorrhea produce nearly identical symptoms in men, which means you can’t tell them apart based on how you feel. Both can cause discharge and painful urination, and both can also produce no symptoms at all. Gonorrhea tends to cause thicker, more noticeable discharge and more obvious pain, while chlamydia is more likely to be subtle or silent. But these are tendencies, not rules. Most clinics test for both infections at the same time for exactly this reason.
Why Half of Infected Men Don’t Know
Research consistently shows that up to 50% of men with chlamydia are completely asymptomatic. They feel fine, see nothing unusual, and have no reason to suspect anything is wrong. This is the single most important thing to understand about chlamydia: the absence of symptoms does not mean the absence of infection. If you’ve had unprotected sex with a new partner, or a partner has tested positive, you could be carrying the infection without any clue.
When and How to Get Tested
The gold-standard test for chlamydia is a nucleic acid amplification test, or NAAT. For men, this is almost always done with a urine sample. You simply pee into a cup. Research has shown that a first-catch urine sample (the initial stream, not midstream) performs as well as, and sometimes better than, a urethral swab. No swab needed in most cases. If you’ve had oral or anal exposure, your provider may swab your throat or rectum separately, since a urine test only detects infections in the urethra.
These tests are highly accurate, with sensitivity above 90% and specificity at 99% or higher. That means false positives are extremely rare, and the test catches the vast majority of infections.
Timing matters. If you think you were exposed, the test is most reliable at least one week afterward, and waiting two weeks catches nearly all infections. Testing too early can produce a false negative because the bacteria haven’t multiplied enough to be detected.
Who Should Get Screened Regularly
CDC guidelines recommend that men who have sex with men get tested at least once a year, regardless of condom use. If you’re on PrEP, living with HIV, or have multiple partners, testing every three to six months is recommended. For heterosexual men, routine screening isn’t broadly recommended at a population level, but it is encouraged if you’re in a high-prevalence setting like an STI clinic or correctional facility, if you’re under 25, or if a sexual partner has tested positive.
In practice, if you have a new sexual partner or more than one partner, getting tested between relationships is a reasonable approach regardless of what category you fall into.
What Happens If It Goes Untreated
Chlamydia is easily curable with antibiotics, but if it’s left untreated, it can spread deeper into the reproductive tract. The most common complication in men is epididymitis, an infection of the coiled tube behind the testicle that stores and carries sperm. This causes pain and swelling in one or both testicles, sometimes intermittent over weeks or months. One documented case of chronic chlamydia-related epididymitis showed significantly reduced sperm quality, including lower sperm count, decreased motility, and increased DNA damage in sperm cells. In other words, untreated chlamydia can affect fertility.
In rare cases, chlamydia can also trigger reactive arthritis, a condition that causes joint pain and swelling, particularly in the knees, ankles, and feet. This happens when the immune system overreacts to the infection, and it can persist even after the chlamydia itself is treated.
What to Expect From Treatment
If your test comes back positive, treatment is straightforward. You’ll receive a short course of oral antibiotics, typically lasting one to seven days depending on which medication your provider prescribes. You should avoid sex until you’ve completed treatment and wait at least seven days after finishing your medication before having sex again. Any recent sexual partners need to be notified and tested, because they may be carrying the infection without symptoms too.
Retesting is recommended about three months after treatment to make sure you haven’t been reinfected, which is common if a partner wasn’t treated at the same time.