Human Papillomaviruses (HPV)
and Genital Warts in Women

1. Sexually Transmitted Diseases Slideshow Pictures
2. Take the Quiz on STDs

Medical Author:

Melissa Conrad Stöppler, MD

Melissa Conrad Stöppler, MD

Melissa Conrad Stöppler, MD, is a U.S. board-certified Anatomic Pathologist with subspecialty training in the fields of Experimental and Molecular Pathology. Dr. Stöppler's educational background includes a BA with Highest Distinction from the University of Virginia and an MD from the University of North Carolina. She completed residency training in Anatomic Pathology at Georgetown University followed by subspecialty fellowship training in molecular diagnostics and experimental pathology.

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Medical Editor:

Jay W. Marks, MD

Jay W. Marks, MD

Jay W. Marks, MD, is a board-certified internist and gastroenterologist. He graduated from Yale University School of Medicine and trained in internal medicine and gastroenterology at UCLA/Cedars-Sinai Medical Center in Los Angeles.

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*Genital warts (HPV) facts author: Melissa Conrad Stöppler, MD

• Genital warts are caused by infection with a subgroup of the human papillomaviruses (HPVs).
  
  
• Another subgroup of the HPVs that infect the anogenital tract can lead to precancerous changes in the uterine cervix and cause cervical cancer.
  
  
• HPV infection is now considered to be the most common sexually-transmitted infection (sexually transmitted disease, STD) in the U.S., and it is believed that at least 75% of the reproductive-age population has been infected with sexually-transmitted HPV at some point in life.
  
  
• HPV infection is common and does not usually lead to the development of warts, cancers, or even symptoms.
  
  
• HPV infection of the genital tract is transmitted through sexual contact, although non-sexual transmission is also possible.
  
  
• In many cases genital warts do not cause any symptoms, but they are sometimes associated with itching, burning, or tenderness.
  
  
• Condom use seems to decrease the risk of transmission of HPV during sexual activity but does not completely prevent HPV infection.

There are over 100 types of human papillomaviruses (HPVs) that infect humans. Of these, more than 40 types can infect the genital tract and anus (anogenital tract) of men and women and cause genital warts known as condylomata acuminata or venereal warts. A subgroup of the HPVs that infect the anogenital tract can lead to precancerous changes in the uterine cervix and cause uterine, cervical cancer. HPV infection also is associated with the development of other anogenital cancers in women. The HPV types that cause cervical cancer also have been linked with both anal and penile cancer in men as well as a subgroup of head and neck cancers in both women and men. Genital warts and HPV infection are transmitted primarily by sexual intimacy, and the risk of infection increases as the number of sexual partners increase.

The most common HPV types that infect the anogenital tract are HPV types 6, 11, 16, and 18 (HPV-6, HPV-11, HPV-16, and HPV-18), although other HPV types can also infect the anogenital tract. Among these, HPV-6 and HPV-11 are most commonly associated with benign lesions such as genital warts and mild dysplasia of the cervix (potentially precancerous changes in the appearance of cervical cells under a microscope) and are termed "low-risk" HPV types. In contrast, HPV-16 and HPV-18 are the types found in the majority of cervical and anogenital cancers as well as severe dysplasia of the cervix. These belong to the so-called "high-risk" group of HPVs.

Other, different HPV types infect the skin and cause common warts elsewhere on the body. Some types of HPVs (for example, HPV 5 and 8) frequently cause skin cancers in people who have a condition known as epidermodysplasia verruciformis.