STD Symptoms in Men: Signs, Timing & When to Get Tested

STD symptoms in men most often include urethral discharge, burning when you pee, sores or blisters, warts or bumps, testicular pain, and sometimes a rash or rectal and throat symptoms. Many sexually transmitted infections cause no symptoms at all in men, so feeling fine is no proof you're clear. CDC, 2021 Only routine testing tells you.

Why many STDs cause no symptoms in men

For most men, the common scenario is no symptoms whatsoever. You can carry and pass on chlamydia, gonorrhea, trichomoniasis, HIV or HPV while feeling completely normal. The infection lives in the lining of the urethra, throat, or rectum without always producing enough inflammation to notice, and a low-grade infection can sit there for weeks, months, or years.

"I feel fine" is one of the most dangerous assumptions in sexual health. Plenty of men only find out they're infected because a partner tells them, or because they're simply due for a check CDC, 2021. Routine screening catches what your body never warns you about, so waiting for a symptom is the wrong strategy.

The most common STD symptoms in men

When symptoms do show up, they tend to fall into a handful of patterns. Knowing what each one actually feels like helps you tell a warning sign from a passing irritation.

• Discharge from the penis: fluid that isn't semen or urine, ranging from thin and clear to thick, cloudy, or yellow-green; it often shows up as a stain in your underwear or a drop at the tip in the morning.
• Burning or pain when you pee (dysuria), a stinging sensation as urine passes through an inflamed urethra; this is the classic overlap with a UTI and one of several painful urination causes.
• Sores, ulcers, or blisters: open areas or fluid-filled blisters on the penis, scrotum, anus, or mouth; some hurt, some don't.
• Warts or bumps: small, flesh-colored or cauliflower-like growths, usually painless.
• Testicular pain or swelling, ache or tenderness that can signal infection spreading to the tube behind the testicle.
• Rash: flat or raised spots on the body, sometimes including the palms and soles, an unusual location that points toward a specific cause.
• Rectal or throat symptoms: anal discharge, pain, or a sore throat after receptive anal or oral sex.

STD symptoms in men by infection

Chlamydia

Chlamydia is the quietest of the common bacterial infections. When it does speak up, it causes discharge and burning on urination, but most men have nothing. Left untreated it can spread to cause epididymitis: inflammation of the coiled tube behind the testicle that stores sperm, which becomes painful and swollen and can affect fertility. Learn more about chlamydia and how it's tested and treated.

Gonorrhea

Gonorrhea tends to be louder than chlamydia. The discharge is often thicker and more purulent (pus-like), and the burning can be sharp. It also infects the throat and rectum, frequently with no symptoms there. Like chlamydia, untreated gonorrhea can move to the testicles. See the full picture of gonorrhea symptoms and care.

Genital herpes

Genital herpes causes painful blisters or ulcers that tend to recur in the same area, sometimes preceded by a tingling or itching warning a day or so before the sores appear. Outbreaks heal on their own, which fools many men into thinking it's gone, but the virus stays in the nerve and can reactivate. Read about genital herpes for the full course.

Syphilis (and its stages)

Syphilis is a staged infection, and each stage looks different. In the primary stage, a single painless sore (called a chancre) appears where the bacteria entered, and because it doesn't hurt and heals by itself, it's easy to ignore. Weeks later the secondary stage brings a rash, classically on the palms and soles, often with mucous-membrane lesions in the mouth or genitals. Then comes a symptom-free latent stage where you feel fine but the infection is still in your body and still detectable on a blood test. Years later, untreated syphilis can rarely cause serious damage to the heart, brain, and nerves. Fading symptoms are not a cure. Here's more on syphilis.

HPV (genital warts and cancer risk)

HPV usually causes no symptoms in men. Some types cause genital, anal, or throat warts; high-risk types cause anal, penile, and oropharyngeal (throat) cancers, often with no warning until much later. There's no routine HPV test for men. The Gardasil-9 vaccine is recommended through age 26 and can be considered up to age 45, and some clinics offer anal Pap screening for higher-risk men: those who have sex with men, or who have HIV.

Trichomoniasis

Trichomoniasis (a parasite) is usually silent in men. When it shows, you may get mild burning or a thin discharge. It's easy to dismiss, but worth treating because you can pass it on.

Mycoplasma genitalium

Mycoplasma genitalium can cause urethritis, discharge and burning much like chlamydia, but it's often silent, and the specific test for it isn't available at every clinic. It's a common culprit when urethritis doesn't clear with standard treatment.

Hepatitis B (and a word on A and C)

Hepatitis B is a sexually transmissible liver infection. When symptoms appear they include fatigue, nausea, dark urine, and jaundice (yellowing of the skin and eyes), but many men have none. It's vaccine-preventable and is part of standard STI panels. Hepatitis A can spread through oral: anal contact, and hepatitis C is often silent for years; the CDC now recommends one-time hepatitis C screening for all adults CDC.

Mpox

Mpox spreads through close sexual contact and, since 2022, has circulated especially among men who have sex with men. It causes firm anogenital or mouth sores and bumps that are easy to mistake for herpes or syphilis, often with fever and swollen lymph nodes. The JYNNEOS vaccine is available for those at higher risk.

HIV (and PrEP, PEP, U=U)

HIV often causes a flu-like illness, fever, sore throat, rash, a few weeks after exposure, then frequently years with no symptoms while it quietly damages the immune system. Three things every man should know: PrEP (a daily pill or a long-acting injection) prevents HIV before exposure; PEP, started within 72 hours of a possible exposure, can stop an infection from taking hold; and U=U, people on effective treatment reach an undetectable viral load and cannot transmit HIV sexually.

How soon do symptoms appear after exposure?

Different infections have different incubation periods, which matters both for spotting symptoms and for timing a test.

Symptoms men mistake for something else

A lot of missed infections come down to a wrong guess. These are the most common mix-ups:

• Dysuria blamed on a UTI. Burning when you pee is far more often an STI in a sexually active man than a true urinary infection.
• Herpes mistaken for jock itch or an ingrown hair. An itchy, blistering patch in the groin gets shrugged off as friction or fungus.
• A syphilis chancre dismissed as a harmless sore. It's painless and heals on its own, so it feels like nothing, but the infection stays and moves on to the next stage.
• Disappearing symptoms read as a cure. A healing herpes outbreak or a vanishing chancre feels like "it went away," but the infection is still there and still transmissible until it's properly treated.

How and when to get tested

Testing is quick and far less involved than most men picture. Chlamydia, gonorrhea, and trichomoniasis are checked with a NAAT on a urine sample or a swab, usually just a urine cup. HIV and syphilis need a blood test, often a quick finger-stick or a simple draw. Many clinics do same-day visits with results back in a few days, and free or low-cost options exist at health departments and Planned Parenthood.

Timing matters because tests can't detect an infection before its window closes. As a general guide, test about two weeks after exposure for chlamydia and gonorrhea; a 4th-generation HIV blood test detects most infections roughly 18–45 days after exposure; and a syphilis blood test is usually reactive by about three to six weeks. Get the full breakdown of when to test after exposure, and when you're ready, you can get tested.

When to see a clinician

Don't wait on these. Any new discharge, persistent burning, a sore or blister, or testicular pain deserves a visit. Men who also notice changes in their erections can gauge them with the IIEF-5 erectile-function self-check. A few signals are especially worth acting on fast: a painless sore, a rash on the palms or soles, or a flu-like illness after a new partner. And remember that most men have no symptoms at all, so a routine check after a new partner, or simply on schedule, beats waiting for a sign that may never come.

Signs often differ by anatomy: for how these show up in women, see STD Symptoms in Women: Female Common and Uncommon STD Symptoms & Warning Signs.

Keep exploring on EasySTD: how and where to get tested and which STD test you need.