The cervix is a female reproductive organ that forms the lower portion of the uterus or womb, and cancer occurs when cervical cells grow out of control. In most cases, the Human Papillomavirus (HPV) causes cervical cancer. Fortunately, there are now two HPV vaccines, Gardasil and Cervarix. Girls as young as 10 can get the vaccine, and all women age 26 and younger should be immunized. Women should also make sure they are getting routine Pap smears during their yearly checkups, as these screen for cervical cancer.