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What Causes Molar Pregnancy?

Molar pregnancy is theorized to be a genetic malfunction of the egg. If the woman has complete molar pregnancy, then the genetic malfunction definitely resides in the egg. That is, an abnormal egg has been fertilized by a normal sperm and the chromosomes of the sperm proceeds to develop but without the normal genetic input from the egg so only a hydatidiform mole is formed.

Partial molar pregnancy

If the woman has partial molar pregnancy, the genetic malfunction might be in the sperm. A normal mature egg is fertilized by two sperms, one of which has abnormal genetic information.


The chromosomes of the normal sperm and the chromosomes of the normal egg continue to develop the embryo. But the other sperm with abnormal genes will produce only a mass of tissue.

Women who had previous molar pregnancies are at risk of having another one.

Does a miscarriage increase the risk of a Molar Pregnancy?

A previous miscarriage also increases the risk of having this condition. Teen pregnancies and pregnancies that occur after the age of 35 are also at risk of having partial molar pregnancies. One risk factor of molar pregnancy that can be addressed is the lack of carotene and lack of vitamin A. This means that the risk of molar pregnancy can be reduced if the woman’s diet has adequate carotene and vitamin A.

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Related links

Molar Pregnancy
Getting Pregnant After Molar Pregnancy
Ectopic Pregnancy
Pregnancy after Miscarriage



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