What causes fibrocystic breast changes?
Experts think that fibrocystic breast changes are linked to the hormone changes that happen during your menstrual cycle. Each month, your body gets ready for a possible pregnancy. It releases hormones that signal the breasts to make milk. The milk (or mammary) glands get bigger, which may make your breasts feel lumpy and tender. These symptoms go away after you start your period. You are more likely to have fibrocystic breasts if your mother or sisters have them too.
