Whether the cervical transformation zone is type III is serious or not depends on the specific cause, if it is low estrogen level or previous cervical surgery is not serious, if it is cervical cancer, it is more serious. Cervical transformation zone is the junction of squamous epithelium and columnar epithelium, and if colposcopy is performed, it will show up as three types, type 1 can be clearly seen, type 2 can be partially seen, and type 3 is completely invisible. Cervical transformation zone for the third type of this situation for more reasons, if the previous cervical surgery or menopausal women with low levels of estrogen, this situation may occur, this is a normal situation, not serious. However, the transformation zone of the cervix is also an area of high incidence of cervical cancer, and if combined with HPV high-risk type infection, it may also be cancerous. This is a more serious condition and tissue biopsy should be performed to make a clear diagnosis.