When the monthly cycle is over, however, these stimulated breast cells cannot simply slough away and pass out of the body like the lining of the uterus. All this activity may contribute to the feeling of breast fullness and fluid retention that women commonly experience before their menstrual period. They also increase the activity of blood vessels, cell metabolism, and supporting tissue.
In the breast, these same hormones stimulate the growth of glandular breast tissue. If pregnancy does not occur, this uterine lining is sloughed off and discharged from a woman's body during menstruation. In the uterus (the womb), these hormones promote the growth and multiplication of the cells lining the uterus. However, there is a major difference between what happens in the breast and uterus: 
The same cyclical hormones that prepare the glandular tissue in the breast for the possibility of milk production (lactation) are also responsible for a woman's menstrual period. These substances may also enhance the effects of estrogen and progesterone and vice versa. The signals from these hormone-like factors may, in fact, be the key contributors to the symptoms of fibrocystic breast condition. Signals that are released from these hormonal products are sent to neighboring breast cells. In addition, the breast itself produces hormonal products from its glandular and fat cells. Prolactin, growth factor, insulin, and thyroid hormone are some of the other major hormones that are produced outside of the breast tissue, yet act in important ways on the breast. Many hormones aside from estrogen and progesterone also play an important role in causing fibrocystic breasts. They directly affect the breast tissues by causing cells to grow and multiply.
The most important of these hormones are estrogen and progesterone. Many hormonal changes occur as a woman's body prepares each month for a possible pregnancy. The most significant contributing factor to fibrocystic breast condition is a woman's normal hormonal fluctuations during her monthly cycle.
Cells that line the surfaces of the secretory cells, called the epithelial cells. Clusters of secretory cells (cells that produce milk) that are connected to the milk ducts (tiny tubes). The glandular tissue is composed of different types of cells: Occupying a major portion of the breast, the glandular tissue is surrounded by fatty tissue and support elements. The sole known biologic function of these glands is the production, or secretion, of milk. What causes fibrocystic or "lumpy" breasts?įibrocystic breast condition involves the glandular breast tissue. Other treatments of fibrocystic breast condition aim at relieving breast tenderness and addressing any menstrual irregularities. Over-the-counter (OTC) medications that may help the pain of fibrocystic breasts include nonsteroidal anti-inflammatory drugs ( NSAIDs) like aspirin, naproxen ( Aleve), and ibuprofen ( Advil). These include vitamins C, E, B6, and A, and primrose oil. Natural home remedies and supplements to help relieve fibrocystic breast pain have been reported helpful in some people. Recommended measures for women with fibrocystic breast condition include learning about the problem and its symptoms, getting regular breast exams, and undergoing regular mammograms. The lumps in fibrocystic breast condition can mimic and mask breast cancer. The foremost concern is not fibrocystic breast condition itself, but the threat of breast cancer. However, the condition becomes less of a problem after menopause ( postmenopause). Fibrocystic breast condition is a cumulative process that mainly affects women over 30 years of age and continues through perimenopause and menopause. Normal hormonal fluctuations during the menstrual cycle is the primary contributing factor to fibrocystic breast condition. Fibrocystic breast condition is very common and benign. For some women, symptoms of fibrocystic breast condition include breast tenderness and breast pain. 
Fibrocystic breast condition causes lumpiness in one or both breasts.Fibrocystic breast condition involves the glandular breast tissue, which plays a role in the production, or secretion, of milk.
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