Each breast has 15 to 20 sections, called lobes, each with many smaller lobules. The lobules end in dozens of tiny bulbs that can produce milk. Lobes, lobules, and bulbs are all linked by thin tubes called ducts. These ducts lead to the nipple, which is centered in a dark area of skin called the areola. The spaces between the lobules and ducts are filled with fat. There are no muscles in the breast, but muscles lie under each breast and cover the ribs. These normal features can sometimes make the breasts feel lumpy, especially in women who are thin or who have small breasts.
In addition, from the time a girl begins to menstruate, her breasts undergo regular changes each month. Many doctors believe that nearly all breasts develop some lasting changes, beginning when the woman is about 30 years old. Eventually, about half of all women will experience symptoms such as lumps, pain, or nipple discharge. Generally these disappear with menopause.
Some studies show that the chances of developing benign breast changes are higher for a woman who has never had children, has irregular menstrual cycles, or has a family history of breast cancer. Benign breast conditions are less common among women who take birth control pills or who are overweight. Because they generally involve the glandular tissues of the breast, benign breast conditions are more of a problem for women of child-bearing age, who have more glandular breasts.
Types of Benign Breast Changes
Benign Breast Changes and Breast Cancer Risk
If You Find A Lump
Breast Biopsy
Source: The National Cancer Institute, National Institutes of Health
