The Human Papilloma Virus (HPV) is a group of viruses that are usually sexually transmitted and can cause genital warts as well as cancers of the cervix, anus, vulva, vagina, penis and even oropharyngeal cancer. There are more than 100 types of HPV and many do not cause problems, but there are two common HPV types called Type 16 and 18 that cause 70% of cervical cancers and precancerous cervical lesions. Untreated, these lesions may progress to cervical cancer.