What causes cervical cancer?
Almost all cases of cervical cancer are caused by HPV. HPV is a very common virus that can be passed on through any type of sexual contact with a man or a woman.
There are more than 100 types (strains) of HPV, many of which are harmless. However, some types can cause abnormal changes to the cells of the cervix, which can eventually lead to cervical cancer.
Two strains, HPV 16 and HPV 18, are known to be responsible for most cases of cervical cancer. They don't have any symptoms, so women will not realise they have it.
But these infections are very common, and most women who have them do not develop cervical cancer.
Using condoms during sex offers some protection against HPV, but it cannot always prevent infection because the virus is also spread through skin-to-skin contact of the wider genital area.
Since 2008, the HPV vaccine has been routinely offered to girls aged 12 and 13.
Read more about the causes of cervical cancer and preventing cervical cancer.