A handful of STIs raise your long-term cancer risk, and they do it through chronic infection rather than the bump or sore you might expect. The main ones are HPV (cervical, anal, penile, and throat cancers), hepatitis B and hepatitis C (liver cancer), and HIV (which weakens immune defenses against several cancers). Most stay silent for years, so screening catches them long before symptoms would.
Comparison
| Item | % of cases without symptoms |
|---|---|
| HPV (oncogenic) | ~95% |
| Hepatitis B (chronic) | ~67% |
| Hepatitis C (chronic) | ~75% |
| HIV (chronic phase) | ~80% |
The short list: which STIs are linked to cancer
Cancer-causing STIs share a pattern: they set up a long-term, often symptom-free infection, and over years that persistent infection drives cellular damage that can become cancer. You can't feel them coming. The candidates worth knowing are HPV, hepatitis B, hepatitis C, and HIV, each with a different tell-tale story and a different way to catch it early.
Which STIs raise your cancer risk
HPV and genital warts
HPV is the most common STI, and it's the heavyweight here CDC. It comes in two flavors that behave very differently. Low-risk types cause genital warts, usually a small bump or a cluster of bumps in the genital area. High-risk types are the ones tied to cancer, and these are typically silent: most HPV infections cause no symptoms and no visible disease at all CDC.
The persistent high-risk infection is what matters for cancer; it can quietly change cervical, anal, penile, vaginal, and throat cells over time. Because the virus can sit undetected, warts and cancer risk don't track together. You can have warts with no cancer risk, or a cancer-driving infection with no warts. Genital warts themselves can show up months or years after exposure, and there's no reliable way to pin down when you acquired the virus CDC. If you're trying to figure out what a wart actually feels like versus something else, see genital warts symptoms.
There's no routine HPV test for men, adolescents, or women under age 30. For most people, the practical safeguard is cervical screening (Pap and HPV co-testing) in those it's recommended for, plus the HPV vaccine.
Hepatitis B
Hepatitis B is a vaccine-preventable liver infection caused by HBV CDC. It's mainly blood-borne and sexually transmitted. The cancer link runs through chronic infection, defined as infection lasting beyond the first six months, which can be lifelong, because long-standing inflammation of the liver can lead to liver cancer over years. Acute infection is the short-term illness in the first six months after exposure.
Many people have no symptoms at all. When acute symptoms do appear, they can include fatigue, fever, poor appetite, nausea, abdominal pain, dark urine, clay-colored stools, joint pain, and jaundice (yellowing of the skin and eyes from the liver struggling to clear bilirubin). Symptoms tend to start on average about 90 days after exposure, in a range of roughly two to five months CDC. Most people with chronic HBV feel fine while the liver damage builds silently. You can read more about how it presents in hepatitis b symptoms.
Hepatitis C
Hepatitis C is a liver disease caused by HCV, spread when infected blood enters another person CDC. Most people who get infected develop a chronic, lifelong infection, and that long-term infection is what raises liver cancer risk. Unlike hepatitis B, hepatitis C is now curable: treatment cures more than 95% of people CDC. Catching and clearing it removes the driver of future liver damage.
It's an especially quiet infection. Most cases cause no symptoms. Jaundice shows up in only about 20–30% of people, and nonspecific symptoms like fatigue, poor appetite, abdominal pain, or dark urine in only about 10–20%. Chronic hepatitis C often causes no specific symptoms for 20 years or more, so people are frequently surprised by a positive test. When acute symptoms do occur, they tend to appear two to twelve weeks after exposure. Because it's curable, finding it early matters most. See hepatitis c cure.
HIV
HIV is a virus that attacks the immune system CDC. It doesn't cause a tumor directly; instead, by weakening immune defenses it raises the risk of several cancers, including some driven by other viruses. Untreated, it moves through three stages: acute (high viral load, very contagious), chronic or clinical latency (the virus stays active and can last a decade or more), and AIDS, the most severe stage, marked by a CD4 count under 200 cells/mm³ or an opportunistic infection.
Within two to four weeks of infection, many people develop flu-like symptoms, what's called acute retroviral syndrome HHS. That can mean fever, chills, rash, night sweats, muscle aches, sore throat, fatigue, swollen lymph nodes, and mouth ulcers. These are easily mistaken for other illnesses, and some people have no symptoms at all, so testing is the only way to know. After the acute phase, years can pass with no symptoms during clinical latency before the immune system is worn down. Early diagnosis and treatment is the single most protective step, and it also helps prevent transmission. More on that in earlier HIV treatment.
How to tell these apart
You usually can't by feel. These infections overlap too much to tell apart by sight or symptom alone, and several are frequently silent. The discriminating features are about the body system involved and the timeline: a visible genital bump points toward warts (low-risk HPV); yellowing skin, dark urine, and right-upper-belly discomfort point toward a liver virus (hepatitis B or C); a flu-like illness a few weeks after a new exposure can signal acute HIV. But none of these is reliable on its own. High-risk HPV, chronic hepatitis, and latent HIV all routinely cause nothing you'd notice.
Overlapping symptoms are why you can't self-diagnose. A test is what turns a guess into an answer.
Side-by-side comparison
| Infection | Cancer link | Typical symptoms | Timing after exposure | How it's caught |
|---|---|---|---|---|
| HPV (high-risk) | Cervical, anal, penile, throat cancers | Usually none; warts only with low-risk types | Warts months to years later; high-risk often never noticed | Cervical Pap/HPV screening (no routine test for men) |
| Hepatitis B | Liver cancer (via chronic infection) | Often none; fatigue, jaundice, dark urine, nausea | Symptoms on average ~90 days | Triple serologic blood panel |
| Hepatitis C | Liver cancer (via chronic infection) | Usually none for 20+ years; sometimes fatigue, jaundice | If any, 2–12 weeks | Antibody test, then confirmatory RNA |
| HIV | Higher risk of several cancers (immune suppression) | Flu-like illness or none | Acute symptoms 2–4 weeks | Blood/oral test by window period |
How these are tested
Testing is straightforward and varies by infection: hepatitis B uses a triple serologic panel. HBsAg for active infection, anti-HBs for immunity or recovery, and total anti-HBc for past or current infection CDC. Hepatitis C starts with an antibody test, and if that's positive an automatic nucleic-acid test confirms current infection CDC. HIV is diagnosed by blood or oral tests, with the right test depending on how long it's been since exposure CDC. In practice you'll give a urine sample, a self-collected swab, or have a quick exam depending on what's suspected: often free or low-cost at health departments, Planned Parenthood, and Title X clinics, with results usually back in a few days. To set it up, get tested.
Screening recommendations are broad on purpose because these infections hide. CDC (2023) recommends all adults 18 and older be screened for hepatitis B at least once in their lifetime, and pregnant people each pregnancy CDC, 2023. For hepatitis C, CDC recommends one-time screening for all adults 18 and older and each pregnancy, and USPSTF gives one-time screening for adults aged 18–79 a Grade B recommendation USPSTF.
What to do next
If you've had a possible exposure, test on the right schedule rather than waiting for symptoms, and remember a negative is only conclusive after the test's window has passed with no exposure during it. Check when to test after exposure before booking. A positive result is not a dead end: hepatitis C is curable for the vast majority, hepatitis B and HIV are managed effectively with treatment that protects the liver and immune system, and HPV-related precancer changes are catchable and treatable through screening long before they become cancer.
Red flags, when to get seen urgently
- Yellowing of the skin or eyes (jaundice), especially with dark urine or clay-colored stools, which can signal significant liver involvement.
- Severe or persistent abdominal pain, ongoing vomiting, or confusion, which warrant same-day evaluation.
- A new, severe flu-like illness within a few weeks of a possible HIV exposure, get tested promptly rather than waiting it out.
- Unexplained weight loss, drenching night sweats, or persistent swollen lymph nodes.
- Any abnormal genital, anal, or oral bleeding, sores, or growths that don't heal, these deserve an in-person exam.
Keep exploring on EasySTD: your risk of an STD, STD vaccines and Hepatitis B testing.