Most cervical cancers grow on the top of the cervix and can be observed with the naked eye. However, very few of them are endogenous, that is, they grow in the cervical canal, and in the early stage, the cervix looks smooth and there is no lesion. Therefore, women over 30 years old should be routinely screened for cervical cancer as long as they are sexually active, regardless of whether there is a problem with the cervix or not, to prevent endogenous type of cancer. Now it has been confirmed that HPV infection is very much related to cervical cancer, so you need to do HPV test and TCT test early to be able to find out if there is any lesion in the cervix early.