Causes
By Mayo Clinic staffThe cause of fibroadenomas is unknown. However, fibroadenoma development is probably related to reproductive hormones. Fibroadenomas occur in greater frequency during your reproductive years, can increase in size during pregnancy or estrogen therapy, and tend to shrink after menopause, when estrogen stimulation decreases.
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- Pruthi S (expert opinion). Mayo Clinic, Rochester, Minn. April 5, 2011.


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