Short answer
When STI symptoms appear at all, they follow rough organism-specific timelines. Gonococcal discharge within days, herpes outbreaks within weeks, syphilis chancres around three weeks, HIV seroconversion illness at 2–4 weeks, warts and secondary syphilis at weeks to months.
But “when symptoms appear” carries a silent majority clause: most infections never produce recognizable onset at all.
Timelines help prioritize testing and date exposures approximately; they never clear anyone, and “it’s been months, I’d know by now” is epidemiologically false.
Continue with Why STI Symptoms May Come and Go and STI Symptoms in Women: Signs and Testing Guide for the directly connected guidance.
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See Tests & Prices →Onset table for symptomatic cases (with the silence caveat)
Gonorrhea: 2–7 days to discharge and burning (the fastest common presenter).
Chlamydia: 1–3 weeks when symptomatic. Usually silent.
Trichomoniasis: days to weeks.
Herpes first outbreaks: roughly 2 weeks post-exposure.
Chancroid: under 10 days.
Syphilis chancre: around 3 weeks.
HIV seroconversion illness: 2–4 weeks (flu-like with rash, sore throat, swollen nodes).
Genital warts: weeks to months.
Secondary syphilis rash: weeks to months after the forgotten chancre.
Tertiary complications: years. Late appearance means missed earlier silent phases, not new exposures.
Why onset misleads in four ways
- Silent majorities: most infections skip symptoms entirely, so onset tables describe minorities.
- Overlapping windows: concurrent infections run different clocks simultaneously.
- Non-STI conditions fill every gap: UTIs, yeast, dermatitis, and viral illnesses mimic each timeline slot.
- Recall distortion: people backdate symptoms to exposures and forget intervening illnesses, corrupting the timelines clinicians need accurate.
Using timelines correctly (and what they’re for)
Timelines prioritize which tests to run now versus later (recent exposure → NAAT now plus serology later), date exposures approximately for partner notification windows, and distinguish plausible from implausible attribution (“sore three days after exposure” fits gonorrhea, not syphilis).
What timelines never do: rule infections out.
Window-period testing schedules, not symptom calendars, close questions. A negative test after the window beats a silent calendar every time.
When to seek care
For any symptom whenever it appears (early symptoms get the most accurate swabs and simplest treatments), after exposures regardless of elapsed time (late testing still catches everything), and on testing schedules fully independent of symptom history.