Often called fibrocystic breast disease, this condition is not a disease. It is a variety of changes that occur in the glandular and stromal (connective) tissues of the breast and may affect one or both breasts. This condition usually affects women between the ages of 30 to 50. Not all women with fibrocystic condition will exhibit symptoms.
Fibrocystic tissue is a result of hormonal changes seen during the menstrual cycle. Changes in your body’s hormone levels lead to the most frequent symptoms of fibrocystic condition. These symptoms include increased "lumpiness or nodularity" and swollen, tender breast tissue. These symptoms typically are somewhat relieved at the end of menstruation.