In some women, the muscles that surround the neck of the womb (cervix) are weaker than usual. This is known as cervical insufficiency, cervical incompetence or short cervix. Previous surgery or investigations to this area can sometimes cause the cervix to open too early, leading to miscarriage or pre-term birth. Cervical insufficiency can also be something you can be born with due to the shape of the uterus.The mid-trimester ultrasound scan will usually identify a short or weak cervix. Your doctor may want to check your cervix early in pregnancy if you have had several miscarriages or if you have had a baby born before 37 weeks of pregnancy.
In some women, the muscles that surround the neck of the womb (cervix) are weaker than usual. This is known as cervical insufficiency, cervical incompetence or short cervix. Previous surgery or investigations to this area can sometimes cause the cervix to open too early, leading to miscarriage or pre-term birth. Cervical insufficiency can also be something you can be born with due to the shape of the uterus.
The mid-trimester ultrasound scan will usually identify a short or weak cervix. Your doctor may want to check your cervix early in pregnancy if you have had several miscarriages or if you have had a baby born before 37 weeks of pregnancy. 
