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Cervical insufficiency

Cervical insufficiency is a condition that causes the lower part of the uterus (cervix) to open (dilate) too early during pregnancy. This happens before the pregnancy reaches term and before labor begins.

Normally, the cervix stays tightly closed as the fetus and uterus grow. With cervical insufficiency, as the pregnancy progresses, the cervix opens too early, which may cause preterm labor.

Current as of: May 1, 2026

Author: WebMD Ignite Staff

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