About half of men with chlamydia have no symptoms at all, which makes it impossible to rule out the infection based on how you feel. When symptoms do show up, they typically appear several weeks after exposure and center on the urethra: pain or burning during urination, discharge from the penis, and sometimes itching at the tip. But the absence of these signs means nothing on its own. The only reliable way to know is to get tested.
What Symptoms Look Like in Men
The most common sign is an unusual discharge from the penis. It can range from thin and clear to thick and yellowish, sometimes with a cloudy or slightly greenish tint. You might notice it on your underwear or only when you squeeze the tip of the penis. The amount varies widely, and some men produce so little that it’s easy to miss entirely.
Burning or stinging during urination is the other hallmark symptom. It can feel similar to a urinary tract infection, mild enough that some men write it off as irritation. You may also notice itching inside the urethra, a sensation that’s hard to scratch and tends to persist throughout the day. Less commonly, one or both testicles may feel tender or mildly swollen, though that can also signal a complication that has already progressed beyond the initial infection.
These symptoms overlap heavily with gonorrhea, which often co-occurs with chlamydia. You cannot distinguish between the two based on symptoms alone, and testing typically screens for both at the same time.
Why You Can’t Rely on Symptoms
Fifty percent of men with chlamydia are completely asymptomatic, according to CDC data. That means you could carry and transmit the infection for weeks or months without any sign that something is wrong. This is the core reason chlamydia spreads so effectively: people who feel fine don’t seek testing, and the bacteria keeps moving through sexual networks undetected.
Even among men who do develop symptoms, the timeline is unpredictable. Symptoms can take several weeks to appear after exposure. During that gap, you’re already infectious. So if you’ve had unprotected sex with a new partner, a partner who tested positive, or multiple partners, testing is the only path to a real answer, regardless of whether you feel anything unusual.
How Testing Works
The standard test is a nucleic acid amplification test, usually done on a urine sample. You simply urinate into a cup, ideally catching the first part of the stream (not midstream, as with other urine tests). This type of test detects the bacteria’s genetic material with over 90% sensitivity and 99% or higher specificity, making false results uncommon. Research has shown that urine samples perform as well as, and sometimes better than, urethral swabs in men, so the old method of inserting a swab into the penis is rarely necessary for standard screening.
If you’ve had receptive anal or oral sex, a urine test won’t catch infections at those sites. Chlamydia can infect the rectum and throat independently of the urethra. Rectal chlamydia may cause discharge, pain, or bleeding from the anus, but it’s often silent. Throat infections are almost always asymptomatic. For these sites, a provider will use a swab, which is quick and not particularly uncomfortable.
When to Test After Exposure
Testing too early after a potential exposure can produce a false negative. The bacteria needs time to replicate to detectable levels. One week after exposure catches most infections. Waiting two weeks catches nearly all of them. If you test before that window and get a negative result but still have reason for concern, retesting after the two-week mark gives you a more reliable answer.
What Happens If It Goes Untreated
Chlamydia that lingers without treatment can spread deeper into the reproductive tract. The most common complication in men is epididymitis, an infection of the coiled tube behind each testicle that stores and carries sperm. It’s the leading cause of scrotal pain in sexually active young men, and chlamydia is one of its most frequent triggers.
Epididymitis develops gradually. You’ll typically notice pain and tenderness on one side of the scrotum that builds over days rather than hitting all at once. The affected side may look swollen, feel warm to the touch, or appear discolored. Other signs include pain during urination, an urgent or frequent need to urinate, discomfort in the lower abdomen or pelvis, and occasionally blood in the semen. Fever is less common but possible. Left untreated, epididymitis can cause chronic pain and, in rare cases, affect fertility.
A related but less common possibility is reactive arthritis, where the immune response to chlamydia triggers joint pain, eye inflammation, and urinary symptoms weeks after the initial infection. This is uncommon, but it underscores why early detection matters.
Treatment and What Comes After
Chlamydia is curable with a short course of antibiotics, typically a seven-day regimen taken twice daily by mouth. Most people tolerate treatment well, and symptoms, if present, start improving within a few days. You should avoid sex for seven days after completing the full course to prevent passing the infection to a partner.
Any recent sexual partners need to know so they can get tested and treated too. If an untreated partner has sex with you again after your treatment, you’ll simply get reinfected. This cycle is common enough that the CDC recommends retesting about three months after treatment to catch reinfection early, even if you have no symptoms. Reinfection doesn’t mean the antibiotics failed. It means you were exposed again.
Who Should Get Screened Routinely
Routine chlamydia screening is formally recommended for all sexually active women under 25, but men don’t have the same blanket recommendation. That doesn’t mean men don’t need testing. If you have a new sexual partner, multiple partners, a partner who tested positive for any STI, or if you have sex with other men, regular screening makes sense. Men who have sex with men should be screened at least annually, and more frequently if they have multiple partners, with testing at all relevant exposure sites (urine, rectal swab, throat swab).
Many sexual health clinics, urgent care centers, and primary care offices can run the test, and some jurisdictions offer at-home test kits that you mail back to a lab. Results usually come back within a few days. The test is straightforward, the treatment is simple, and catching it early prevents both complications for you and transmission to others.