Most STD symptoms show up within a few days to a few weeks after exposure, but the timeline varies widely depending on the infection. Some, like gonorrhea, can cause noticeable symptoms in under a week. Others, like hepatitis B, can take months. And many STDs produce no symptoms at all, which is why testing matters even when you feel fine.
Chlamydia: 1 to 3 Weeks
Chlamydia symptoms typically appear 5 to 14 days after exposure. You might notice unusual discharge, burning during urination, or pelvic pain. But here’s the critical detail: an estimated 77% of all chlamydia cases never produce symptoms. Women are especially likely to have no signs of infection. This makes chlamydia one of the most commonly missed STDs, and one of the most important to screen for, since untreated infections can lead to fertility problems over time.
Gonorrhea: 2 Days to 2 Weeks
Gonorrhea tends to show up faster than most STDs. In men, symptoms often start within five days of exposure and commonly include painful urination and discharge. In women, symptoms of a genital tract infection generally appear within 10 days, though they can take up to two weeks.
Like chlamydia, gonorrhea is frequently silent. Roughly 45% of all gonorrhea cases never cause symptoms, and the rate is higher in women (up to 70%). Vaginal infections are especially likely to go unnoticed. If you were exposed, waiting for symptoms to appear is not a reliable way to know whether you’re infected.
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 episode usually involves small, fluid-filled blisters on the genitals, buttocks, or surrounding areas. This first outbreak is often the most painful and can be accompanied by flu-like symptoms, swollen lymph nodes, and general discomfort.
Not everyone who contracts herpes gets a noticeable first outbreak, though. Some people have symptoms so mild they mistake them for irritation or ingrown hairs. Others don’t experience a recognizable outbreak until months or years later, often triggered by stress or illness. This is one reason herpes spreads so easily: many carriers don’t know they have it.
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 an average of about 21 days. The sore typically lasts 3 to 6 weeks and heals on its own whether or not you get treated.
That self-healing is deceptive. The infection doesn’t go away; it progresses to a secondary stage that can involve rashes, fever, and sore throat weeks to months later. Because the initial sore is painless and often hidden (inside the mouth, on the genitals, or in the rectum), many people never notice it. Syphilis is highly treatable in its early stages, but it causes serious complications if left alone.
HIV: 2 to 4 Weeks
The earliest stage of HIV, called acute infection, generally develops within 2 to 4 weeks after the virus enters the body. Symptoms at this stage often resemble a bad flu: body aches, fever, fatigue, sore throat, and swollen glands. Many people dismiss it as a routine illness and never connect it to HIV exposure.
After this initial phase passes, HIV can remain silent for months to years before causing further symptoms. During that time, the virus is still active and transmissible. This long quiet period is why HIV testing is so important after a potential exposure, even if you feel completely healthy.
Trichomoniasis: 5 to 28 Days
Trichomoniasis, caused by a parasite rather than a bacterium or virus, typically produces symptoms within 5 to 28 days. These can include irritation, itching, unusual discharge, or discomfort during urination. Some people don’t develop symptoms until well after that window, and many never notice anything at all.
Hepatitis B: 8 Weeks to 5 Months
Hepatitis B has one of the longest incubation periods of any STD. If symptoms appear at all, they can show up anywhere from 8 weeks to 5 months after exposure. Signs of acute infection include fatigue, nausea, stomach pain, dark urine, and yellowing of the skin or eyes. Symptoms usually last several weeks, though some people feel sick for up to 6 months. Many people with hepatitis B, particularly adults, clear the virus on their own, but a portion develop chronic infection that requires long-term monitoring.
Why Testing Timelines Differ From Symptom Timelines
There’s an important distinction between when symptoms appear and when a test can actually detect an infection. The gap between exposure and a reliable positive test result is called the window period, and it’s different from the incubation period for symptoms. Testing too early can give you a false negative.
For chlamydia and gonorrhea, testing at one week catches most infections, and testing at two weeks catches nearly all. Syphilis takes longer: a blood test at one month catches most cases, but waiting three months catches almost all of them. HIV blood tests (the type that checks for both antigens and antibodies) catch most infections at two weeks, with nearly complete accuracy by six weeks. Herpes blood tests need the most patience, often requiring one month to detect most infections and up to four months to catch almost all cases.
Hepatitis B blood tests generally become reliable at 3 to 6 weeks post-exposure. Hepatitis C takes longer still, with most cases detected at two months and near-complete detection by six months.
No Symptoms Doesn’t Mean No Infection
The single most important thing to understand about STD timelines is that many infections never produce obvious symptoms. Chlamydia is silent in roughly 3 out of 4 cases. Gonorrhea goes unnoticed nearly half the time. Herpes, syphilis, and HIV all have phases where the infection is active but invisible. If you’re relying on symptoms to tell you whether you’ve been infected, you’re likely to miss it. The only reliable way to know your status is testing, timed appropriately based on the window periods above.