With CI, the cervix opens without labor starting. Usually the woman has no symptoms. Few women know they have cervical insufficiency until they have a miscarriage or premature birth. The woman may give birth to the baby without feeling contractions.
If you've had a pregnancy affected by CI, the condition is likely to happen again in later pregnancies.
What causes CI?
Medical experts do not always know why incompetent cervix occurs. Theories include damage to the cervix during surgery, injury during a previous birth, and exposure to certain drugs.
Cervical length appears to be a factor. The shorter the cervix, the more likely you are to have cervical insufficiency. Ask your health care provider about having an ultrasound to check for short cervix.
How is CI diagnosed?
Providers have not found a reliable way to routinely check all women for cervical insufficiency. If a woman has previously lost a pregnancy in the second or third trimester, vaginal ultrasound during the next pregnancy may help predict she's at risk for preterm birth.
How is CI treated?
Providers sometimes recommend:
Last reviewed April 2012