Many STDs in men produce no symptoms at all, which means you can’t rely on how you feel to know your status. The only way to be certain is to get tested. That said, there are specific physical signs that can signal an infection, and knowing what to watch for helps you act quickly when something isn’t right.
Most Common Symptoms to Watch For
The signs that send most men to a clinic fall into three categories: unusual discharge, pain during urination, and sores or bumps on the genitals. Any one of these warrants testing, but the specific combination can point toward different infections.
Discharge from the penis. Chlamydia and gonorrhea are the most common causes. Chlamydia typically produces a clear or slightly cloudy discharge, while gonorrhea tends to cause thick, cloudy, or bloody discharge. Either can appear on its own or alongside other symptoms.
Painful or burning urination. This is a hallmark of both chlamydia and gonorrhea, and it’s also the most recognizable symptom of a lesser-known infection called Mycoplasma genitalium. That infection often gets mistaken for persistent urethritis because testing for it only recently became widely available.
Testicle pain or swelling. Both chlamydia and gonorrhea can spread to the testicles if untreated, causing swelling and tenderness on one or both sides.
Rectal symptoms. If you’ve had receptive anal sex, chlamydia and gonorrhea can infect the rectum. Symptoms include rectal pain, discharge, bleeding, or painful bowel movements. These infections at non-genital sites are frequently asymptomatic, making routine screening especially important for men who have sex with men.
Sores, Bumps, and Skin Changes
Genital sores are one of the few STD symptoms you can actually see, but telling them apart without a test is harder than most people think.
Syphilis produces what’s called a chancre: a firm, round sore that’s usually painless. It appears at the spot where the bacteria entered the body, typically on the penis, scrotum, or around the anus. The sore lasts 3 to 6 weeks and heals on its own whether or not you get treatment. That self-healing is actually dangerous, because the infection is still progressing internally even though the sore is gone.
Herpes sores behave differently. They tend to appear as clusters of small blisters that break open into painful, shallow ulcers. Unlike syphilis, herpes sores typically hurt, and they can recur in the same area over time.
Genital warts from HPV look different from both. They’re usually flesh-colored, soft bumps that can appear individually or in clusters with a cauliflower-like texture. They’re painless and can show up weeks or months after exposure.
Why You Can’t Rely on Symptoms Alone
Here’s the problem with waiting for signs: a large percentage of STD infections in men produce no symptoms whatsoever. Chlamydia is the classic example. Many men carry it for weeks or months with no discharge, no pain, nothing. Gonorrhea can also be silent, particularly when it infects the throat or rectum rather than the urethra. In one CDC study of men who have sex with men attending community venues, 13.3% tested positive for chlamydia or gonorrhea at rectal or throat sites, and these infections were overwhelmingly asymptomatic.
Syphilis is easy to miss because its painless sore can appear in a spot you don’t notice, like inside the rectum, and then disappear. HIV is especially deceptive. The earliest stage generally develops 2 to 4 weeks after infection and may cause flu-like symptoms such as fever, headache, and rash. Those symptoms are so generic that most people chalk them up to a cold. After this brief phase, HIV can remain silent for years.
What Testing Actually Involves
STD testing for men is straightforward and usually involves some combination of three things: a urine sample, a blood draw, and occasionally a swab.
For chlamydia and gonorrhea, you’ll most often just urinate into a cup. If you’ve had oral or anal sex, your provider may also swab the throat or rectum because urine tests only detect infections in the urethra. Syphilis and HIV are diagnosed through blood tests. Herpes can be tested with a blood draw if you have no active sores, or by swabbing an open sore directly. HPV is typically identified by a visual exam of any warts or, in some cases, an anal swab.
The whole process is quick. Most visits take 15 to 30 minutes, and many clinics offer walk-in testing without needing an appointment.
When to Test After Exposure
Testing too soon after a potential exposure can produce a false negative. Every infection has a window period, the minimum time needed for a test to detect it accurately.
- Chlamydia and gonorrhea: One week catches most infections. Two weeks catches nearly all.
- Syphilis: A blood test picks up most cases at one month. Three months catches almost all.
- HIV (blood test): An antigen/antibody blood test detects most infections at two weeks. Six weeks catches almost all.
- HIV (oral swab): One month catches most. Three months catches almost all.
If you test negative but tested early in the window, it’s worth retesting at the longer interval to be sure.
How Often You Should Get Screened
Screening recommendations differ depending on your sexual partners. The CDC recommends all men ages 13 to 64 get tested for HIV at least once, regardless of risk factors.
For men who have sex with women, routine chlamydia and gonorrhea screening isn’t broadly recommended unless you’re in a higher-risk setting, such as having multiple partners, a new partner, or a history of prior STDs. Syphilis screening is recommended for men under 29 and anyone with risk factors like multiple partners.
For men who have sex with men, the guidelines are more aggressive: annual testing for chlamydia, gonorrhea, syphilis, and HIV at minimum, with testing every 3 to 6 months if you have multiple partners, are on PrEP, or are living with HIV. Chlamydia and gonorrhea testing should cover every site of sexual contact, not just the urethra. Hepatitis B testing is also recommended for all MSM.
What to Do Right Now
If you’re noticing discharge, burning, sores, or swelling, get tested as soon as possible. If you have no symptoms but had unprotected sex or a condom failure, wait at least one to two weeks for chlamydia and gonorrhea testing, and longer for syphilis and HIV. In the meantime, avoid sexual contact to reduce the chance of passing anything on.
Testing is available at sexual health clinics, primary care offices, urgent care centers, and many pharmacies. Some clinics offer free or low-cost testing, and home test kits for HIV are available over the counter. For a full panel covering multiple infections, an in-person visit gives the most comprehensive results.