About half of men with chlamydia never develop any symptoms at all, which is one reason it spreads so easily. When symptoms do appear, they typically show up within a few days to several weeks after exposure. The most common signs are pain or burning during urination and an unusual discharge from the penis, but the infection can also affect the rectum and, if left untreated, the testicles.
The Most Common Symptoms
The hallmark signs of chlamydia in men center on the urethra, since that’s where the bacteria typically take hold first. You may notice a burning or stinging sensation when you urinate, sometimes mild enough to be mistaken for a urinary tract infection. Discharge from the penis is the other classic symptom. It can be clear, white, or slightly yellowish, and it may be light enough that you only notice it in the morning or as a small stain on your underwear.
Some men also experience swollen or tender testicles, and occasionally a low-grade fever. Testicular pain happens when the infection moves deeper into the reproductive tract, reaching a coiled tube behind each testicle called the epididymis. This is a sign the infection has progressed and needs prompt attention.
Why Half of Men Have No Symptoms
Roughly 50 percent of men with chlamydia are completely asymptomatic, according to CDC surveillance data. That means you can carry and transmit the infection for weeks or months without ever feeling anything unusual. This is the central challenge with chlamydia: the absence of symptoms doesn’t mean the absence of infection or the absence of harm.
Because so many cases are silent, routine screening is the only reliable way to catch the infection early, especially if you’ve had unprotected sex with a new partner or multiple partners. Testing is simple. The CDC recommends a urine-based test as the standard for men. You provide a “first catch” urine sample (the initial stream, not midstream), and a lab analyzes it using a highly accurate method called nucleic acid amplification. No swab is necessary in most cases, though rectal or throat swabs may be used depending on your sexual history.
Rectal Chlamydia Symptoms
Chlamydia can infect the rectum through receptive anal sex. Rectal infections often produce no symptoms either, but when they do, the signs include rectal pain, discharge from the rectum, and bleeding. These symptoms can be easy to dismiss or attribute to other causes, which means rectal chlamydia frequently goes undiagnosed unless you specifically ask for rectal testing. Throat infections from oral sex are also possible, though they rarely cause noticeable symptoms.
Chlamydia vs. Gonorrhea Symptoms
Chlamydia and gonorrhea infect the same sites and produce overlapping symptoms, which makes it difficult to tell them apart based on symptoms alone. Both can cause painful urination and penile discharge. That said, gonorrhea tends to produce symptoms that are more noticeable and appear faster, often within two to five days. The discharge from gonorrhea is frequently thicker and more yellow or green compared to the thinner, clearer discharge that chlamydia sometimes causes.
The overlap is significant enough that most clinicians test for both infections simultaneously. You can also have both at the same time, which happens often enough that dual testing is standard practice.
What Happens if Chlamydia Goes Untreated
Left alone, chlamydia in men can spread to the epididymis, the tube that stores and carries sperm from each testicle. This condition, called epididymitis, causes noticeable swelling and pain on one or both sides of the scrotum. Chronic or repeated epididymitis from untreated chlamydia can lead to scarring that blocks sperm transport, potentially causing infertility.
Untreated chlamydia also increases your susceptibility to other sexually transmitted infections, including HIV, because the inflammation it causes makes tissues more vulnerable to additional pathogens. The infection can also be passed to sexual partners who may then develop their own complications.
Treatment and Recovery
Chlamydia is fully curable with antibiotics. The current first-line treatment is a seven-day course of an oral antibiotic taken twice daily. Most people clear the infection completely within that week. You should avoid sexual contact until you’ve finished the full course and your partner has been treated as well, otherwise reinfection is likely.
Retesting is recommended about three months after treatment. This isn’t because the antibiotic failed; it’s because reinfection rates are high, particularly if a partner wasn’t treated or if you’ve had new exposures. A negative retest at the three-month mark confirms you’re clear.