•  Human papillomaviruses (HPVs):HPV infection is the main risk factor for cervical cancer. HPV is a group of viruses that can infect the cervix. HPV infections are very common and can be passed from person to person through sexual contact. Most adults have been infected with HPV at sometime in their lives. Some types of HPV can cause changes to cells in the cervix. These changes can lead to genital warts, cancer and other problems. Doctors may check for HPV even if there are no warts or other symptoms.

If a woman has an HPV infection, her doctor can discuss ways to avoid infecting other people. The Pap test can detect cell changes in the cervix caused by HPV. Treatment of these cell changes can prevent cervical cancer. There are several treatment methods, including freezing or burning the infected tissue. Sometimes medicine also helps.

Studies suggest the following may be additional risk factors for developing cervical cancer:

•  Lack of regular Pap tests: Cervical cancer is more common among women who do not have regular Pap tests. The Pap test helps doctors find precancerous cells. Treating precancerous cervical changes often prevents cancer.
•  Weakened immune system: Women with HIV (the virus that causes AIDS) infection or who take drugs that suppress the immune system have a higher-than-average risk of developing cervical cancer. For these women, doctors suggest regular screening for cervical cancer.
•  Age: Cancer of the cervix occurs most often in women over the age of 40.
•  Sexual history: Women who have had many sexual partners have a higher-than-average risk of developing cervical cancer. Also, a woman who has had sexual intercourse with a man who has had many sexual partners may be at higher risk of developing cervical cancer. In both cases, the risk of developing cervical cancer is higher because these women have a higher-than-average risk of HPV infection.
•  Other sexually transmitted diseases (STDs): Infection with other STDs such as chlamydia, syphilis or gonorrhea makes infection with HPV more likely.
•  Smoking cigarettes: Women with an HPV infection who smoke cigarettes have a higher risk of cervical cancer than women with HPV infection who do not smoke.
•  Using birth control pills over a long period: Using birth control pills over a long period (five or more years) may increase the risk of cervical cancer among women with HPV infection.
•  Having many children: Studies suggest that giving birth to many children may increase the risk of cervical cancer among women with HPV infection.
•  Diethylstilbestrol (DES) may increase the risk of a rare form of cervical cancer and certain other cancers of the reproductive system in daughters exposed to this drug before birth. DES was given to some pregnant women in the United States between about 1940 and 1971. (It is no longer given to pregnant women.)