The short answer
Human papillomavirus (HPV) causes six types of cancer. While routine vaccination is recommended at ages 11–12, FDA approval extends up to age 45 for adults who were not fully vaccinated younger.
The 9-valent HPV vaccine (Gardasil 9) protects against 9 high-risk HPV types that cause over 90% of HPV-attributable cancers.
HPV causes cervical, throat (oropharyngeal), anal, penile, vaginal, and vulvar cancers.
The FDA expanded approval of the HPV vaccine for adults aged 27 through 45 based on clinical evidence showing safety and efficacy.
Adults aged 27 to 45 can engage in shared clinical decision-making with their doctor to decide if vaccination is beneficial.
Choose how you want to understand this
The full explanation.
Adult HPV Vaccination: A Plain-Language Cancer Prevention Guide
For many years, public health messages focused on giving the human papillomavirus (HPV) vaccine to adolescents in middle school. As a result, many adults in their late 20s, 30s, or 40s assume that the window of opportunity for HPV vaccination has passed.
That is not what the evidence says. The U.S. Food and Drug Administration (FDA) licenses the 9-valent HPV vaccine (Gardasil 9) for people aged 9 through 45. The Centers for Disease Control and Prevention (CDC) sets out how that applies to adults.
So it is worth knowing how the vaccine works in adults. It is also worth asking your doctor about it. The shot guards against six kinds of cancer.
Representative Story Disclosure
This is a representative story created from common experiences described by patients and caregivers. It is not the story of one identifiable person, and individual experiences can differ substantially.
A Composite Example: Mark's Experience
Mark, a 34-year-old high school athletic director, re-entered the dating scene after a divorce. During a routine annual checkup, his physician brought up cancer prevention habits, including HPV vaccination.
Mark was surprised: "Isn't the HPV vaccine just for middle school kids? And doesn't HPV only cause cervical cancer?"
His doctor explained where the risk sits. High-risk HPV strains cause about 70% of throat (oropharyngeal) cancers. Those cancers are rising fast in men in their 30s, 40s and 50s. The same strains also cause anal and penile cancers. Mark had not had the shot as a teen. The 3-dose adult series would guard him against strains he had not met yet.
Mark completed his 3-dose series over 6 months.
Mark reflected:
"Learning that the HPV vaccine protects men against throat cancer and is approved up to age 45 made getting the shots an easy choice for my long-term health."
Cancers Prevented by the 9-Valent HPV Vaccine
High-risk HPV strains cause over 37,000 cancer cases in the United States each year. The 9-valent vaccine covers strains 16 and 18, which cause most of them. It also covers five more high-risk strains: 31, 33, 45, 52 and 58. Two low-risk strains, 6 and 11, are in it too. Those two cause genital warts.
Six Cancers Prevented by HPV Vaccination:
1. Cervical Cancer (Over 90% caused by HPV)
2. Throat / Oropharyngeal Cancer (About 70% caused by HPV)
3. Anal Cancer (Over 90% caused by HPV)
4. Vaginal Cancer (About 75% caused by HPV)
5. Vulvar Cancer (About 69% caused by HPV)
6. Penile Cancer (Over 60% caused by HPV)
Adult Vaccination Guidelines (Ages 27 through 45)
CDC Advisory Committee on Immunization Practices (ACIP) recommendations by age group:
- Ages 9–14: 2-dose series (0 and 6–12 months). Routine recommended age is 11–12.
- Ages 15–26: 3-dose series (0, 1–2, and 6 months) for anyone not adequately vaccinated younger.
- Ages 27–45: Shared Clinical Decision-Making. Adults who are not fully vaccinated can talk with their doctor about whether vaccination is right for them based on personal risk and potential new exposure.
Why Get Vaccinated as an Adult?
- Protection Against Unencountered Strains: Even if an adult has been exposed to one strain of HPV in the past, Gardasil 9 protects against nine distinct strains.
- New Relationship Protection: Adults who are single, dating, or planning new relationships gain active protection against future viral exposures.
- High Throat Cancer Rates in Men: Oropharyngeal (throat/tonsil) cancer is now the most common HPV-related cancer in the U.S., occurring nearly 5 times more often in men than in women.
Questions to Ask Your Doctor
- "Based on my age and health history, do you recommend I receive the 3-dose adult HPV vaccine series?"
- "Will my insurance plan cover Gardasil 9 for adults over age 26?"
- "Does getting the HPV vaccine replace the need for routine cervical cancer screening (Pap/HPV testing)?" (Answer: No — routine cervical screening remains essential).
Key Takeaways
- Approved up to age 45: Adults aged 27 to 45 can receive Gardasil 9 after speaking with their doctor.
- Prevents 6 cancer types: Protects against cervical, throat, anal, penile, vaginal, and vulvar cancers.
- 3-dose adult schedule: Adults require 3 doses given over a 6-month period.
- Screening still required: Vaccination complements, but does not replace, routine cervical Pap/HPV screening.
Frequently Asked Questions
Does getting the HPV vaccine as an adult treat an existing HPV infection?
No. The vaccine acts as a preventative barrier against future infection from the 9 covered strains. It does not treat existing active infections or abnormal cell changes.
Is the HPV vaccine safe for adults?
Yes. Trials and 15 years of follow-up cover millions of doses. The safety record is strong. Most side effects are mild. Usually it is brief soreness or redness where the shot went in.
Related Resources
- Cancer Vaccines for Prevention
- Cervical Cancer Screening Overview
- Abnormal Pap or HPV Test: What Now?
- Head and Neck Cancer Overview
Sources
- Centers for Disease Control and Prevention — HPV Vaccination Considerations for Adults Ages 27 Through 45
- Centers for Disease Control and Prevention — HPV Vaccination Clinical Guidance for Providers
- U.S. Food and Drug Administration — GARDASIL 9 (licensed for ages 9 through 45)
- National Cancer Institute — HPV Vaccines Fact Sheet
Words to know
Tap any term to see what it means.
Common questions
Can adults up to age 45 get the HPV vaccine?
Yes. The FDA approved Gardasil 9 for individuals aged 9 through 45. Adults aged 27 through 45 should discuss vaccination with their healthcare provider.
Does the HPV vaccine treat an existing HPV infection or abnormal Pap test?
No. The HPV vaccine prevents *future* infections from high-risk HPV strains included in the vaccine. It does not cure an existing infection or clear abnormal cervical cells.
How many doses are required for adults starting the vaccine series?
For individuals starting the HPV vaccine series at age 15 or older (including adults up to 45), a 3-dose schedule given over 6 months (0, 2, and 6 months) is required.
Questions to ask your doctor
Being prepared helps you get the most out of your appointments. Save or print these questions.
Tap a question to save it to your list (kept on this device).
Speak With Trained Specialists & Human Navigators
Cancer Explained provides educational guidance, but does not replace trained specialists, social workers, or your medical team.
Talk to a trained cancer information specialist
Free, confidential assistance from NCI Cancer Information Service via phone, chat, or email.
Contact your oncology team
Locate after-hours contact numbers, portal messages, or urgent triage phone lines.
Find a patient navigator
Get one-on-one help with appointments, logistics, translation, and care coordination.
Find a genetic counselor
Discuss inherited mutation risk, family history, and genetic testing options.
Find an oncology social worker
Access emotional counseling, family support groups, and mental health resources.
Find a financial navigator
Locate copay assistance foundations, grant programs, and lodging/travel support.
Find a clinical-trial specialist
Search matching studies and speak with NCI trial information specialists.
Get urgent help
Immediate emergency guidance for fever (>100.4°F during chemo), severe pain, or shortness of breath.
Help Us Improve This Guide
Did this explanation answer your question and help you determine your next step?
Know someone who needs this?
Plenty of people are looking for something like this and do not know where to start. If this would help a friend or someone you love, send it on — we have written an opening line so you do not have to stare at an empty message. You can change every word of it.
Your message is written and sent in your own email or messaging app — we never see who you send it to, and nothing is added to any list.
Knowledge Check
0 of 3 answered
This self-assessment checks understanding of educational content only. It is not medical advice.
Plain-language explanation of the published sources cited on this page. AI-assisted, source-checked, not clinician-reviewed.
Written by: Cancer ExplainedSources last checked: 2026-08-11 what this meansLast updated: 2026-08-11Next planned review: 2027-07-23
How this page was created
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes. We do not employ clinicians and do not intend to — our work is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status — Source checked. This page was written with AI assistance and checked line by line against the sources listed on it. That confirms the sources support what the page says. It is not a medical review, and it does not confirm the page is complete or right for your situation.
General education — varies by person. Answers genuinely differ between people. This page explains what commonly varies and points you to your care team for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
How this page was created
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes. We do not employ clinicians and do not intend to — our work is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and checked line by line against the sources listed on it. That confirms the sources support what the page says. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
Read more about our editorial process, our use of AI, and our corrections policy.
Spotted a problem? Report an error — a factual mistake, broken or outdated source, confusing wording, or anything that seems unsafe. Please do not include names, medical record numbers, dates of birth, addresses, or other identifying medical information in your report.
After using this page, do you understand what to do next?
Anonymous — we only record the answer, never who gave it.
Related articles
Still have questions?
Educational answers, plain language
Free to print and share