There is no way to know when we get infected with HPV or when HPV causes cellular lesions. We can only watch and wait, and this ordeal is painful and helpless for women with HPV infection. But at least we can see how HPV assembles its own DNA into the DNA of human cells and causes cellular lesions leading to cervical precancer and cervical cancer. As the saying goes, “flies do not bite seamless eggs”, only when the body’s immunity decreases, the mucosal surface is broken, the immune cells acting as guardians are slackened, and the defense mechanism is flawed, the HPV that has been lurking for a long time takes advantage of the situation and enters the body of human cells across the cell membrane, shedding its coat (coat protein) and releasing its DNA to integrate itself into the replicating cell DNA. The DNA is integrated into the DNA of the replicating cells, multiplying and cleaving, and eventually causing the cells to become diseased. It is as if the product of the production line is reintegrated to form another new product, changing the characteristics of the original product. Therefore, only when one is strong and has normal immune function and maintains cellular integrity can one defend oneself against foreign viral invasion.