Overview
A weak cervix shortens and opens painlessly in the second trimester.
Past second-trimester loss or cervical surgery raises the risk.
Symptoms
Common signs:
- Pelvic pressure
Less common
- Spotting
Look up a symptom: Pregnant or recently gave birth · Recent miscarriage or pregnancy loss
When to get medical care
Call 911Heavy bleeding, severe belly pain, fluid leaking, fever, or fewer baby movements: call 911 or go to labor and delivery.
Get care todayNew or worse symptoms, or symptoms with fever.
See a doctor soonSymptoms that last or keep coming back.
Causes
Weak tissue.
Does it spread or run in families?
- It isn't contagious. You can't catch it from someone else.
Who is more likely to get it
- Past loss
Diagnosis
A clinician asks about your symptoms and may order tests.
The exam
A physical exam.
Tests
Tests, if needed:
- Cervical length ultrasound:
Treatment
Treatment depends on the cause and how severe it is.
Self-care
- Keep all ultrasound appointments
- Follow activity advice
Which doctor treats this
- Start with your primary care provider (family doctor or internist).
- They may send you to an OB-GYN or midwife; high-risk pregnancies may see a maternal-fetal medicine doctor.
Children, pregnancy, and older adults
- People with past cervical surgery: Higher risk.
Outlook
Treatment helps many carry longer.
Getting ready for your visit
Bring a list of your symptoms and medicines.
What to bring
- A list of your medicines and supplements
- Notes on when symptoms started and what makes them better or worse
Questions to ask
- What's causing this?
- What treatment do you recommend?
Research studies
Research studies test new ways to find and treat health problems. Some are looking for volunteers. Talk with your doctor before joining one.
Search ClinicalTrials.gov for studies on Weak cervix (cervical insufficiency)
Sources
Last updated 2026-11-12.