A large cervical opening, also known as a loose cervical opening, can be caused by many reasons, such as congenital conditions, post-cervical surgery, and menstruation. 1. Congenital conditions: the development of the cervix has congenital factors, if there is congenital cervical insufficiency, there may be loose cervical opening. 2. After cervical surgery: Cervical diseases, such as cervical intraepithelial neoplasia, require cervical cerclage. If a large area of cervical tissue is removed, it may result in a loose cervical opening. 3. Transmenstrual women: If the cervix is damaged during labor or if the uterus does not recover well after delivery, the cervical function may be affected and cervical laxity may occur. There are many reasons for cervical relaxation, and for women who do not have the need to have children, there is usually no need for treatment. However, if you are pregnant, you need to be alert to the possibility of miscarriage and, if necessary, under the guidance of your doctor, undergo cervical cerclage to reduce the risk of miscarriage.