Cervical carcinoma in situ and cervical precancerous lesion grade 3 are not the same. Cervical precancerous lesion grade 3 belongs to severe atypical hyperplasia, which is usually characterized by the presence of heterogeneous cells in the cervix, which are present in most or all of the cervical epithelium, and may lead to cancer as the disease progresses; cervical carcinoma in situ refers to the presence of cancerous cells in the epithelium of the patient’s cervix, which is usually only found in the epithelium of the cervix, and does not have spread or metastasis. Whether it is cervical carcinoma in situ or grade 3 pre-cancerous lesion of the cervix, the lesion needs to be removed through surgery in time, and only through active treatment can the disease be controlled. Patients should be examined in time when relevant symptoms appear and treated for the cause of the disease.