The cause is not completely understood. This condition is not cancerous. In addition to causing cysts and rubbery areas in one or several areas in one or both breasts, the fibrocystic condition can cause a dull, heavy pain and tenderness in the breasts that appears on a monthly basis. The symptoms can range from mild to severe. They often peak just before each menstrual period and retreat 1 week later.
Fibrocystic changes can make breast examination and mammography harder to interpret.
Always consult your own doctor about any opinions or recommendations with respect to your symptoms or medical condition. Beth Israel Deaconess Medical Center .