Skip to Content
Home > Wellness > Health Library > Vanishing Twin Syndrome
Vanishing twin syndrome is a condition in which one of two fetuses
disappears sometime during the first 12 weeks of a pregnancy.
Early in a multiple pregnancy, it is possible for a woman to
miscarry one fetus and to notice some vaginal bleeding or to notice nothing
unusual. Sometimes the embryo or fetus is reabsorbed by the mother's
Vanishing twin syndrome may be caused by too little of the hormone
that supports pregnancy (human chorionic gonadotropin, or hCG). It does not
appear to harm the mother or the surviving twin.
Current as of:
May 30, 2016
Sarah Marshall, MD - Family Medicine & William Gilbert, MD - Maternal and Fetal Medicine
To learn more about Healthwise, visit Healthwise.org.
© 1995-2016 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.
I Want To...
Our interactive Decision Points guide you through making key health decisions by combining medical information with your personal information.
You'll find Decision Points to help you answer questions about:
Get started learning more about your health!
Our Interactive Tools can help you make smart decisions for a healthier life. You'll find personal calculators and tools for health and fitness, lifestyle checkups, and pregnancy.
Feeling under the weather?
Use our interactive symptom checker to evaluate your symptoms and determine appropriate action or treatment.