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HPV stands for human papillomavirus. HPVs are a group of more than 150 related viruses. Each HPV virus in the group is given a number, and is called an HPV type (for instance, HPV-16).
HPVs are called papillomaviruses because some of the HPV types cause warts or papillomas, which are non-cancerous tumors. But some types of HPV are known for causing cancer. HPV causes most cases of cervical cancer, as well as many vaginal, vulvar, anal, penile, and oropharyngeal cancers (cancers of the throat and mouth).
The papillomaviruses are attracted to and are able to live only in certain cells in the body called squamous epithelial cells. These cells are found on the surface of the skin and on moist surfaces (called mucosal surfaces) like:
About 75% of the HPV types cause warts on the skin – often on the arms, chest, hands, and feet. These are common warts.
The other 25% of HPV types are considered mucosal types of HPV. These can infect the moist surface layers that line organs and cavities of the body that open to the outside, like those listed above. The mucosal HPV types are also called genital (or anogenital) type HPVs because they often affect the anal and genital area.
Yes. Vaccines are available to help prevent infection by certain types of HPV and some of the cancers linked to those types. As of 2020, Gardasil 9 is the only HPV vaccine available in the United States. Other HPV vaccines are available outside the U.S.
All of these vaccines help prevent infection by HPV-16 and HPV-18. These 2 types cause most cervical cancers and pre-cancers, as well as many cancers of the anus, penis, vulva, vagina, and throat.
Gardasil 9 helps prevent infection by 4 types of HPV (16, 18, 6 and 11), plus 5 other high risk types: 31, 33, 45, 52 and 58. Together these types cause about 90% of cervical cancers.
HPV vaccine produces the strongest immune response in preteens. To work best, the HPV vaccines should be given between the ages of 9 to 12. The vaccines are given in a series of shots.
The vaccine work best at this age. Research shows that younger people have a better immune response to the vaccine than those in their late teens and early 20s. And, the vaccines will prevent the covered types of HPV only if they are given before exposure to the virus.
This is also an age when other vaccinations are given, and when children are likely to still be getting regular medical check-ups.
The HPV vaccine is most effective in early adolescence, but this starts to decrease by age 18. Because of this, it is unlikely to provide much benefit for cancer prevention as people get older. The ACS does not recommend HPV vaccination for persons older than age 26 years.
Pregnant women should not get any HPV vaccine at this time, even though they appear to be safe for both mother and the unborn baby. If a woman who is pregnant does get an HPV vaccine, it’s not a reason to consider ending the pregnancy. Women who started a vaccine series before they learned they were pregnant should complete the series after the pregnancy.
Make sure the health care provider knows about any severe allergies. The following should not get an HPV vaccine:
No. In fact, testing is not recommended because it cannot show if the HPV vaccine will be effective or not. A positive HPV test result doesn’t always tell you which types of HPV you have. And even if you are infected with one type of HPV, the vaccine could still prevent other types of HPV infection. A negative test result cannot tell you if you’ve had HPV in the past.
How long a vaccine will protect people is never known when the vaccine is first introduced. Current research shows that the vaccine is effective, and there’s no sign that the protection decreases with time. Research will continue to look at how long protection against HPV lasts, and if booster shots will be needed.
All of the HPV vaccines were tested in thousands of people around the world before they were approved. And they continue to be constantly monitored for safety. So far, all studies show no deaths have been linked to any HPV vaccine. Common, mild side effects include headache, fever, nausea, and dizziness. Sometimes pain and redness can happen where the shot was given.
As with any medication or injection, people may have an allergic reaction afterwards. Anyone who has a severe (life threatening) allergy to any ingredient in the HPV vaccine should not get the vaccine, including a severe allergy to yeast. Some people may faint after getting any vaccine, including HPV vaccines. Fainting after getting a shot is more common in teens than in young children or adults. To keep people from getting hurt from fainting, a 15-minute waiting period for people of all ages is recommended after any vaccination.
Like all vaccines, even “old” vaccines approved many years ago, the HPV vaccines are continuously monitored for side effects. The US Centers for Disease Control and Prevention (CDC) and the US Food and Drug Administration (FDA) review all serious side effects reported to the Vaccine Adverse Event Reporting System (VAERS) to watch for potential safety concerns that may need further study.
Insurance plans will probably cover the HPV vaccine cost if it is given according to national guidelines. But check with your insurance plan to be sure.
The vaccines are included in the federal Vaccines for Children (VFC) program. This program covers vaccine costs for children and teens who don’t have insurance. The VFC program provides free vaccines to children and teens younger than 19 years of age, who are either Medicaid-eligible, American Indian or Alaska Native, or uninsured.
The VFC program also allows children and teens to get VFC vaccines through federally qualified health centers or rural health centers. For more on the VFC program or to find the VFC contact where you live, visit www.cdc.gov/vaccines/programs/vfc/contacts-state.html, or call 1-800-232-4636.
Yes. People who have gotten the HPV vaccine will still need regular testing for cervical cancer because the vaccines may not prevent all of the types of HPV that can cause cervical cancer.
See The American Cancer Society Guidelines for the Prevention and Early Detection of Cervical Cancer to learn more.
The American Cancer Society medical and editorial content team
Our team is made up of doctors and oncology certified nurses with deep knowledge of cancer care as well as journalists, editors, and translators with extensive experience in medical writing.
Centers for Disease Control and Prevention. Guidelines for Vaccinating Pregnant Women. October 10, 2014. Accessed at www.cdc.gov/vaccines/pubs/preg-guide.html#bfeeding on July 12, 2016.
Centers for Disease Control and Prevention. HPV Vaccine Information for Clinicians. Accessed at www.cdc.gov/hpv/hcp/need-to-know.pdf on July 12, 2016.
Centers for Disease Control and Prevention. Vaccine Safety. Human Papillomavirus (HPV) Vaccine. October 27, 2015. Accessed at www.cdc.gov/vaccinesafety/vaccines/hpv-vaccine.html on July 11, 2016.
Food and Drug Administration. FDA approves expanded use of Gardasil 9 to include
individuals 27 through 45 years old. Accessed at https://www.fda.gov/NewsEvents/Newsroom/PressAnnouncements/ucm622715.htm
on October 8, 2018.
National Cancer Institute. HPV and Cancer. February 19, 2015. Accessed at www.cancer.gov/about-cancer/causes-prevention/risk/infectious-agents/hpv-fact-sheet on July 11, 2016.
New Zealand Ministry of Health. Myths and facts about HPV and the vaccine. Accessed at www.hpvvaccine.org.au/parents/myths-and-facts-about-hpv-and-the-vaccine.aspx on July 11, 2016.
Robinson CL. Advisory Committee on Immunization Practices Recommended Immunization Schedules for Persons Aged 0 Through 18 Years — United States, 2016. MMWR. 2016:65(4):86-87.
Saslow D, Andrews KS, Manassaram-Baptiste D, et al. Human papillomavirus vaccination 2020 guideline update: American Cancer Society guideline adaptation. CA Cancer J Clin. 2020; DOI: 10.3322/caac.21616.
Last Revised: July 21, 2020
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