Half of all men with chlamydia have no symptoms at all, which means many infections go undetected without testing. When symptoms do appear, they typically show up several weeks after exposure and most commonly involve unusual discharge from the penis and pain during urination. But the reality is that the most reliable way for men to know they have chlamydia is through a simple lab test, not by waiting for symptoms to appear.
Symptoms That Do Show Up
When chlamydia causes noticeable symptoms in men, the infection usually targets the urethra (the tube you urinate through). The most common signs are a discharge from the tip of the penis and a burning sensation when you pee. The discharge can range from thin and clear to thick and yellowish, and it often shows up as a stain on underwear before you notice it otherwise. Some men also experience itching or irritation around the opening of the penis.
These symptoms can be mild enough to dismiss as nothing serious, which is part of why chlamydia spreads so easily. A slight burning during urination or a small amount of discharge might not seem worth a doctor’s visit, but even mild symptoms from chlamydia mean the infection is active and transmissible.
Rectal and Throat Infections
Chlamydia doesn’t only infect the urethra. Men who receive anal sex can develop a rectal infection, which may cause pain, discharge, or bleeding from the rectum. Oral sex can lead to a throat infection, though this rarely produces noticeable symptoms. Both rectal and throat chlamydia can exist without any signs at all, and standard urine tests won’t detect infections at these sites. If you’ve had oral or anal sex, let your provider know so they can swab the right areas.
When Symptoms Appear
If you’re going to develop symptoms, they typically show up several weeks after the sexual contact that transmitted the infection. There’s no precise day you can circle on a calendar. Some men notice something within one to three weeks, while others carry the infection for months before anything feels off, if it ever does. This long, quiet incubation period is one reason chlamydia is the most commonly reported bacterial sexually transmitted infection in the United States.
What Happens if It Goes Untreated
Left alone, chlamydia can spread deeper into the reproductive tract. The most common complication in men is epididymitis, an infection of the coiled tube that sits behind each testicle and carries sperm. This causes pain and swelling on one side of the scrotum that develops over days, not minutes. The testicle itself can become involved, and the spermatic cord running up from the testicle often becomes tender and swollen too. Epididymitis from chlamydia is treatable, but repeated or severe episodes can potentially affect fertility.
Chlamydia also increases vulnerability to other sexually transmitted infections, including HIV, because the inflammation it causes makes tissue more susceptible to new infections.
How Testing Works
The standard chlamydia test for men is a urine sample. You collect the very first part of your urine stream into a sterile cup. To get an accurate result, you need to avoid urinating for at least two hours before the test, because the bacteria collect near the opening of the urethra and a recent trip to the bathroom can wash them away. The lab uses a highly sensitive technique called nucleic acid amplification to detect even tiny amounts of the bacteria’s genetic material.
For rectal or throat testing, a provider uses a small swab to collect cells from the site. In some clinics, you may be given the option to swab yourself. The process is brief and causes only minor discomfort.
Timing matters. If you think you were exposed, testing too early can produce a false negative. A urine or swab test will catch most infections after one week, but waiting two weeks after exposure catches nearly all of them. If you test negative at one week but still have concerns, retesting a week later gives you a more definitive answer.
Who Should Get Tested
Because half of infected men never develop symptoms, relying on how you feel is not a reliable strategy. You should consider testing if you have a new sexual partner, if a partner tells you they’ve tested positive, if you’ve had unprotected sex, or if you notice any of the symptoms described above. Men who have sex with men face higher rates of chlamydia at all three sites (urethral, rectal, and throat) and benefit from screening at least once a year, or more frequently with multiple partners.
Treatment and What to Expect
Chlamydia is curable with antibiotics. The current first-line treatment is a week-long course of oral antibiotics taken twice daily. Most men feel symptom relief within a few days, but finishing the full course is essential to clear the infection completely. You should avoid sex for seven days after completing treatment to prevent passing the bacteria to a partner.
Any recent sexual partners need to be tested and treated too, even if they feel fine. Otherwise, you can be reinfected the next time you have sex with them. Reinfection is common, and repeat infections carry the same risks of complications as the original one. Getting tested again about three months after treatment confirms the infection is gone and that reinfection hasn’t occurred.