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Genetic and Rare Diseases Information Center (GARD)

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Hydatidiform mole

Other Names for this Disease
  • Hydatid mole
  • HYDM
  • Molar pregnancy
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Molar pregnancy is a condition in which the placenta does not develop properly. The symptoms of molar pregnancy, which may include vaginal bleeding, severe morning sickness, stomach cramps, and high blood pressure, typically begin around the 10th week of pregnancy. Because the embryo does not form or is malformed in molar pregnancies, and because there is a small risk of developing a cancer called choriocarcinoma, a D&C is usually performed.[1]
Last updated: 7/15/2013


  1. Ectopic and Molar Pregnancy. March of Dimes. 2005; Accessed 2/21/2008.
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Basic Information

  • The American College of Obstetricians and Gynecologists (ACOG) has an information page titled Early Pregnancy Loss:  Miscarriage and Molar Pregnancy.  Visit the link below to view the information page.
  • The March of Dimes has an information page titled Ectopic and Molar Pregnancy.  To access the information page, please visit the link below.
  • MedlinePlus was designed by the National Library of Medicine to help you research your health questions, and it provides more information about this topic.
  • The Merck Manuals Online Medical Library provides information on this condition. Click on the link to view the information.
  • The National Cancer Institute provides the most current information on cancer for patients, health professionals, and the general public.  Click on the link to view information on this topic. 

In Depth Information

  • Medscape Reference provides information on this topic. Click on the link to view this information. You may need to register to view the medical textbook, but registration is free.
  • The Online Mendelian Inheritance in Man (OMIM) is an catalog of human genes and genetic disorders. Each entry has a summary of related medical articles. It is meant for health care professionals and researchers. OMIM is maintained by Johns Hopkins University School of Medicine. 
  • PubMed is a searchable database of medical literature and lists journal articles that discuss Hydatidiform mole. Click on the link to view a sample search on this topic.