What is the cause of cervical cancer?

What is the cause of cervical cancer?
Human Papilloma Virus (HPV), a sexually transmitted infection which in most cases (80%) is cleared by the body’s immune system in 8-14 months. The presence of HPV may be detected by the Pap smear. Some women who have persistent infections may develop abnormalities of the cervix. This is why it is important to have a regular Pap smears.