Doctors don't know what causes fibroadenomas, but development of fibroadenomas may be related to reproductive hormones. Fibroadenomas occur more often during your reproductive years, can become bigger during pregnancy or use of hormone therapy, and may even shrink after menopause, when hormone levels decrease.
May. 02, 2014
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- Pruthi S (expert opinion). Mayo Clinic, Rochester, Minn. Feb. 5, 2014.
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