When a woman is screened for cervical cancer, if the result shows cervical cancer in situ, it means that the epithelial cells in the cervix have developed tumor-like lesions, and the cancer cells are in the epithelial layer or epidermis of the cervix before they reach the mucosal muscle layer. In the true sense, cervical carcinoma in situ is not a cancer as we usually understand it, but a transitional stage before cervical carcinoma, which can also be understood as an early stage of cervical cancer. Cervical carcinoma in situ is an early manifestation of cervical cancer. Carcinoma in situ is not cancer in the usual sense, it is an intraepithelial neoplastic lesion. It is an intraepithelial neoplastic lesion that is progressing to cancer. If the neoplastic lesion is not suppressed, it will break through the epithelial tissue and become an invasive cancer, which is the true cervical cancer. Cervical carcinoma in situ is a serious disease and can be said to be one step away from cancer, but after all, it is not cancer and does not belong to the scope of terminal disease. If symptoms appear and are detected in time, it is much more treatable than cancer, so it can be completely cured with timely treatment. Women who have been diagnosed with carcinoma in situ must be treated in time and should not delay, because the more delayed the symptoms will become more serious and will turn into real cervical cancer. Once it becomes true cervical cancer, treatment will be more difficult and the prognosis will be poor, and the mortality rate will be higher.