The main causes of cervical laxity in clinical practice include: 1. too frequent sexual intercourse, especially unclean sexual intercourse, causing certain stimulation to the cervix, especially in the case of frequent infections can cause cervical laxity. 2. if the patient often undergoes medical abortion or abortion, repeated uterine operations can also cause this condition. 3. if the patient is normal normal delivery, in the process of delivery, there are cervical tears, cervical injury and other conditions occur. In the process of normal delivery, there are cervical tears, cervical injury and other conditions occur, especially in the case of poor healing will cause cervical relaxation. For patients with severe cervical laxity, if you get pregnant again, you need to choose the right time for cervical cerclage to avoid miscarriage.