In women of childbearing age, the columnar epithelium is originally inside the cervical canal, but due to the high secretion of estrogen in the body, the columnar epithelium has migrated to the surface of the cervix, covering the original squamous epithelium, causing a phenomenon similar to erosion on the surface of the cervix, often called cervical erosion. This phenomenon is not a disease, but a normal physiological phenomenon that does not cause symptoms and therefore does not need to be treated with appropriate medication. However, cervical cancer screening should be done once a year to find out if there are lesions on the cervical epithelium and then decide whether treatment is needed based on the results. It is also recommended to pay attention to the hygiene of sexual and menstrual period for columnar epithelial migration, because the resistance of columnar epithelium is lower than the original overlying squamous epithelium, which can easily lead to local inflammatory reaction.