Short answer
STI symptoms in men span discharge, burning, sores, warts, rashes, throat and rectal symptoms after corresponding exposures, and testicular pain. But the defining feature of male STI symptomatology is how often nothing appears at all.
Most infections cause no symptoms, which means absence of signs proves nothing and routine screening (not symptom-watching) is the safety net.
Symptoms, when present, trigger testing; they never complete diagnosis.
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See Tests & Prices →Discharge and burning in detail
Discharge ranges from scant clear (chlamydia, M.
genitalium) through white to thick yellow-green (gonorrhea). Character suggests, NAAT confirms.
Burning during urination (dysuria) accompanies urethritis from gonorrhea, chlamydia, trichomoniasis, or M.
genitalium.
Non-STI causes, UTIs (especially with frequency and urgency in older men), prostatitis (perineal ache, recurrent bacteriuria), chemical irritation, look identical, which is why dual workups (NAAT plus urinalysis) beat guessing.
See Burning Urination in Men: UTI vs STI.
Sores, warts, and rash. The visual signs
Painless firm sores suggest primary syphilis; painful grouped blisters suggest herpes; flesh-colored growths suggest HPV warts; diffuse rash including palms and soles suggests secondary syphilis.
Each needs clinician evaluation with appropriate swabs or blood tests. Never self-diagnosis by appearance or internet photos, which mislead in both directions (missing real STIs, alarming over benign variants like pearly papules).
Pain signals and their urgency tiers
Testicular swelling and pain (possible epididymitis from ascending chlamydia/gonorrhea) warrants same-day care.
Pelvic ache suggests prostatitis or deep infection.
Rectal pain or discharge after anal exposure warrants prompt rectal-swab evaluation.
Severe sudden testicular pain is an emergency until proven otherwise. Torsion (twisted testicle) destroys tissue within hours and shares early features with infection.
See Testicular Pain: When to Get Urgent Care.
The silent majority that defines strategy
Chlamydia (majority silent), gonorrhea (especially throat and rectal sites), syphilis (latent years), HIV (asymptomatic years), HPV (near-universal silence), herpes (most shedding days asymptomatic). The typical male STI experience is feeling fine while infectious.
Partners, pregnancies, and future fertility all pay for undetected infection, which is why sexually active men screen on schedule (yearly minimums, quarterly with ongoing risk) regardless of how healthy they feel.
When to seek care
Same-day or prompt care for any discharge, sore, burning, swelling, or rash.
Emergency care for severe sudden testicular pain, inability to urinate, or fever with genital symptoms.
Routine screening when sexually active. Symptoms or not, and especially with new or multiple partners.