About half of men with chlamydia have no symptoms at all, which makes it one of the trickiest infections to catch without testing. When symptoms do appear, they typically show up several weeks after exposure and tend to be mild enough that many men brush them off or mistake them for something else.
Symptoms to Watch For
The most common sign of chlamydia in men is an unusual discharge from the penis. Unlike gonorrhea, which tends to produce thick, yellow-green discharge, chlamydia discharge is typically clear, watery, or slightly mucus-like. It’s often subtle enough to go unnoticed unless you’re paying attention.
The second hallmark symptom is a burning sensation when you urinate. This can range from a mild sting to noticeable pain, and it’s easy to confuse with a urinary tract infection. Some men also experience mild itching or irritation around the opening of the penis.
If you’ve had anal sex, chlamydia can also infect the rectum. Rectal symptoms include pain, discomfort, bleeding, or a mucus-like discharge. Oral chlamydia from unprotected oral sex is possible too, though it rarely causes noticeable symptoms.
Why You Can’t Rely on Symptoms Alone
The 50% asymptomatic rate in men is the core problem. You can carry and spread chlamydia for months without ever feeling anything wrong. This is why routine testing matters far more than symptom-watching, especially if you’ve had unprotected sex with a new partner or multiple partners.
Even when symptoms do appear, they overlap heavily with gonorrhea. The two infections frequently occur together, and the discharge, burning, and discomfort can look nearly identical. A lab test is the only reliable way to tell which infection you’re dealing with, and most clinics will test for both at the same time.
When Symptoms Typically Appear
If you’re going to develop symptoms, they generally show up several weeks after the sexual encounter that transmitted the infection. There’s no precise day you can circle on a calendar. Some men notice something within one to two weeks, while others don’t develop symptoms for a month or more. The delay is long enough that many men don’t connect their symptoms to a specific partner or encounter, which complicates both diagnosis and notification.
How Testing Works
The standard test for chlamydia in men is a urine sample. No swab, no blood draw. You simply urinate into a cup, and the lab runs a nucleic acid amplification test (NAAT), which detects the bacteria’s genetic material. NAATs are highly sensitive and are considered the gold standard for chlamydia detection. For rectal or throat infections, a swab of the affected area is used instead.
Timing matters. Testing too soon after exposure can produce a false negative because the bacteria haven’t multiplied enough to be detected. For the most accurate result, wait at least two weeks after the encounter you’re concerned about. If you test negative but still have symptoms or ongoing concern, retesting after a few more days is reasonable.
You can get tested at your primary care doctor’s office, a sexual health clinic, an urgent care center, or through at-home test kits that you mail to a lab. Many clinics offer confidential or anonymous testing.
What Happens If It Goes Untreated
Left alone, chlamydia doesn’t just sit quietly. The infection can spread to the epididymis, the coiled tube behind each testicle that stores and carries sperm. This condition, called epididymitis, causes pain and swelling on one side of the scrotum, tenderness that can extend up along the spermatic cord, and sometimes fluid buildup around the testicle. It’s uncomfortable enough that most men seek medical attention at this stage, but by then the infection has been present long enough to potentially cause lasting damage, including chronic pain and reduced fertility.
Chlamydia also increases your susceptibility to other sexually transmitted infections, including HIV. And every day the infection goes undetected, there’s a risk of passing it to sexual partners, who may face their own serious complications.
Treatment and Follow-Up
Chlamydia is curable with a short course of antibiotics. Most people feel better within a few days of starting treatment, and the infection clears completely in the vast majority of cases. You should avoid sex for at least seven days after finishing your antibiotics to prevent passing the infection to anyone.
A common mistake is assuming that one round of treatment means you’re done thinking about it. The CDC recommends retesting approximately three months after treatment, regardless of whether your partner was also treated. Reinfection is common, particularly if your sexual partner didn’t receive treatment at the same time. If three months isn’t practical, get retested whenever you next see a healthcare provider within the following year.
Don’t retest too early. Testing within four weeks of completing antibiotics can pick up dead bacterial DNA that’s still clearing from your body, triggering a false positive result. The three-month window gives your body time to clear those remnants and allows enough time to catch a genuine reinfection.
Who Should Get Tested Routinely
If you’re a sexually active man who has sex with men, annual chlamydia screening is recommended, with more frequent testing (every three to six months) if you have multiple partners. Heterosexual men don’t have the same blanket screening recommendation, but testing makes sense any time you have a new partner, have had unprotected sex, or a partner tells you they’ve tested positive for an STI. Given that half of infected men never develop symptoms, the safest assumption after any higher-risk encounter is that testing is the only way to know for sure.