I know this because unfortunately I recently found out I have it too. :-( I also found out through a routine test, because I have never had visible warts anywhere, not even on my hands (which is different anyway). I have probably had it for well over 20 years, from my teen years. It really really disgusts me. And yes it can cause cancer. There's even a new commercial on TV that says it can cause cancer. I have abnormal cells that can turn into pre-cancer and then cancer, but I won't let that happen. I am doing cleanses, eating raw food, and doing everything I can to get rid of it, even though the regular medical community says it's incurable and will be with a person forever! If people on this site have cured themselves of the AIDS/HIV virus then I can cure myself of the HPV virus too!!!!