Fibroids may grow during pregnancy, simply because the higher hormone levels (progesterone and estrogen) supporting your pregnancy can also cause the fibroid to grow. They will usually shrink back down after the baby is born.
Typically, there are no complications associated with fibroids and pregnancy. If the growth partially or completely blocks the cervical canal, a caesarean section may be necessary to deliver the baby. Rarely, the fibroid can grow large enough to cause the baby to be delivered prematurely. Though the risks are small, it is important to maintain an open dialogue with your doctor about any concerns that you may have.
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References:
Uterine fibroids. (2011, June). Retrieved from http://www.mayoclinic.com/health/uterine-fibroids/DS00078/DSECTION=complications
Uterine fibroids. (2011, January 11). Retrieved from http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0001912/