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Molar pregnancy

Also called: Molar pregnancy, hydatidiform mole

An abnormal pregnancy where tissue grows instead of a baby, causing bleeding and very high hCG.

TreatmentRemoval, then hCG checks

Overview

A molar pregnancy forms when the placenta grows abnormally. There's usually no baby or a baby that can't survive.

After removal, hCG is checked until it's zero to make sure no tissue remains.

Symptoms

Common signs:

  • Bleeding in early pregnancy
  • Grape-like tissue passed, or severe vomiting with bleeding in early pregnancy

Less common

  • Severe nausea
  • Very high hCG

When to get medical care

Call 911Heavy bleeding.
Get care todayBleeding in pregnancy.
See a doctor soonSymptoms that last or keep coming back.

Causes

Abnormal fertilization.

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

  • Women under 20 or over 40: Higher risk

Possible complications

  • Gestational trophoblastic disease: Tissue keeps growing; needs follow-up

Diagnosis

Ultrasound and hCG.

Treatment

Follow up.

Self-care

  • Use birth control during follow-up
  • Keep hormone follow-up tests

Prevention

To lower your risk or prevent problems:

  • There is no known way to prevent it. Early checkups help find it sooner.

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.

Living with it

Support groups and helplines

Children, pregnancy, and older adults

  • Under 20 or over 35: Higher risk.
  • Women under 20 or over 40: Higher risk.

Outlook

Cured with treatment.

Cure rates are very high.

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

  • How long will follow-up last?

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 Molar pregnancy

Sources

Last updated 2026-11-12.