Most STI symptoms appear within a few days to a few weeks after exposure, but the timeline varies widely depending on the infection. Some show up in under a week, others take months, and many never cause noticeable symptoms at all. Here’s what to expect for each common STI, along with what the lack of symptoms actually means.
Chlamydia: 1 to 3 Weeks
When chlamydia does cause symptoms, they typically appear one to three weeks after exposure. The problem is that most people with chlamydia never notice anything wrong. About 70% of women and 50% of men with chlamydia have no symptoms at all. When symptoms do show up, they usually involve unusual discharge, burning during urination, or pelvic pain in women.
Gonorrhea: 2 Days to 2 Weeks
Gonorrhea tends to announce itself faster than chlamydia, with symptoms usually appearing within two to eight days, though it can take up to two weeks. Men are more likely to notice symptoms (burning urination, discharge) than women. At least 50% of women and up to 40% of men with gonorrhea remain completely asymptomatic, which is why it spreads so easily without anyone realizing.
Syphilis: 10 to 90 Days
Syphilis has one of the widest incubation windows. The first sign is a painless sore called a chancre, which appears at the site of infection anywhere from 10 to 90 days after exposure, with 21 days being the average. Because the sore is painless and sometimes hidden (inside the mouth, vagina, or rectum), many people miss it entirely. The sore heals on its own within three to six weeks whether or not you get treatment, but the infection continues progressing if untreated.
HIV: 2 to 4 Weeks
The earliest stage of HIV, called acute infection, generally develops within two to four weeks after exposure. During this phase, some people experience flu-like symptoms: fever, headache, rash, body aches. These symptoms are easy to dismiss as a cold or the flu, and they resolve on their own. After that, HIV can remain silent for months to years before causing further problems, which is why testing is the only reliable way to know your status.
Herpes: 2 to 12 Days
A first herpes outbreak typically appears 2 to 12 days after exposure, with an average of about 4 days. The initial outbreak is usually the most severe: painful blisters or sores around the genitals, rectum, or mouth, sometimes accompanied by fever and body aches. Some people experience symptoms so mild they never realize they have herpes.
Before recurring outbreaks, many people notice warning signs called prodromal symptoms. These include genital pain, tingling, or shooting pain in the legs, hips, or buttocks. These signals can appear hours to days before visible sores develop.
HPV (Genital Warts): 1 to 6 Months
Genital warts caused by HPV have a long incubation period, typically one to six months after exposure. Many HPV strains never produce visible warts at all. The strains that cause warts are different from the strains linked to cancer, and most HPV infections clear on their own without ever causing symptoms.
Trichomoniasis: 5 to 28 Days
Trichomoniasis symptoms usually appear within 5 to 28 days, though some people don’t develop symptoms until much later. Women are more likely to notice symptoms (itching, burning, unusual discharge with a strong odor) than men, who often carry the infection without any signs.
Hepatitis B: 6 Weeks to 6 Months
Hepatitis B has the longest average incubation period of any common STI. Symptoms like fatigue, nausea, abdominal pain, and jaundice (yellowing of the skin and eyes) typically appear around 90 days after exposure, but the range stretches from 60 to 150 days. Many infections, particularly in adults, produce no symptoms at all.
Hepatitis C: 2 Weeks to 6 Months
Hepatitis C symptoms usually emerge within two to six weeks of exposure but can take up to six months. Most people with acute hepatitis C have no symptoms, which is one reason the infection often goes undetected for years.
Why No Symptoms Doesn’t Mean No Infection
The most important thing to understand about STI timelines is that “no symptoms” is the most common outcome for many of these infections. Chlamydia, gonorrhea, trichomoniasis, HPV, and both forms of hepatitis frequently produce no noticeable signs. You can carry and transmit any of these infections while feeling perfectly fine. This is why routine testing matters more than symptom monitoring.
Testing Windows Are Different From Symptom Timelines
Even if you’re past the incubation period, a test taken too early can come back negative. Every STI has a testing window: the time it takes for the infection to become detectable. These windows don’t always match the symptom timeline.
- Chlamydia and gonorrhea: Detectable within one week for most cases; two weeks catches nearly all.
- Syphilis: Blood tests catch most cases at one month, nearly all by three months.
- HIV: Blood tests using the antigen/antibody method catch most cases at two weeks and nearly all by six weeks. Oral swab tests take longer, catching most at one month and nearly all by three months.
- Herpes: Antibody blood tests catch most cases at one month, nearly all by four months. Swab tests of active sores work sooner.
- Trichomoniasis: Detectable within one week for most; one month catches nearly all.
- Hepatitis B: Blood tests become reliable at three to six weeks.
- Hepatitis C: Blood tests catch most cases at two months, nearly all by six months.
If you’re concerned about a specific exposure, the most reliable approach is to test at the appropriate window for each infection rather than waiting for symptoms that may never come.