Definition of Fibrocystic breast disease:

Fibrocystic breast disease refers to benign (noncancerous) changes in the tissues of the breast. The term "disease" in this case is misleading, and many health care providers prefer the term "change."

The condition is so common that it is believed to be a variation of normal. It may also be called mammary dysplasia, benign breast disease, and diffuse cystic mastopathy.

Causes, incidence, and risk factors:

The cause is not completely understood. The changes are believed to be associated with hormones produced by the ovaries because the condition usually subsides with menopause, when ovary function changes. The changes also may vary during the menstrual cycle.

Fibrocystic breast disease is estimated to affect over 60% of all women. It is common in women between the ages of 30 and 50, and rare in women who have gone through menopause. It is less common in women who take birth control pills.

Risk factors include a family history of the condition, a high fat diet, and excess caffeine intake, although these are controversial.