Fibroadenoma of the breast occurs mainly in young women and is rarely seen in post-menopausal women: 1. It is usually believed that fibroadenoma of the breast is related to the hormone levels of estrogen and progesterone, and that the breast is sensitive to the response of estrogen. When the patient secretes a large amount of estrogen before menstruation, the estrogen level is too high. The actual fact is that you can find a lot of people who are not able to get a good deal on a lot of things.