Slight opening of the mouth of the uterus may be a normal physiological phenomenon, or it may be caused by multiple pregnancies, preterm labor, cervical insufficiency, etc., and you should consult a doctor in time to find out the cause. 1. Normal physiological phenomenon: Under normal circumstances, a woman’s cervical opening is closed. However, when a woman is ovulating, the mouth of the uterus may be slightly open and the vaginal secretion increases, which is a normal physiological phenomenon. 2. Multiple pregnancies: The uterine opening cannot be completely closed due to the number of deliveries, and the uterine opening appears slightly open during the examination. 3. Pre-eclampsia: Slight opening of the uterus may be caused by irregular contractions, uterine compression, fetal descent, etc. It is a sign of pre-eclampsia, which is a necessary process of normal labor and delivery, and may be accompanied by lumbar pain and a small amount of vaginal discharge of light blood. It is necessary to consult the doctor in time, improve the relevant examination and carry out further treatment under the doctor’s guidance. 4. Cervical Insufficiency: i.e. endocervical laxity, which may be caused by congenital dysplasia of the cervical tissue structure. As the endocervical opening cannot function as a sphincter, the endocervical opening is easy to open, and the symptom of slightly open uterine opening may occur. If the uterine opening is slightly open, excluding physiological factors, you should consult a doctor in time to clarify the cause of the disease, and if necessary, the doctor will give appropriate treatment.