Cervical cancer is mostly seen in the squamous-columnar junction of the uterine cervix. There are two types of epithelium in the uterus, one is visible to the naked eye, called squamous epithelium, and the other is located in the cervical canal, which is not visible to the naked eye, called columnar epithelium. The junction of the two types of epithelium is called squamous junction, which is more prone to cervical cancer. If abnormalities are found, further colposcopy is needed to magnify the squamocolumnar junction to observe abnormal cellular signs, such as vigorous vascular proliferation, denser and thicker epithelium, and biopsy can reveal cancer cells.