[Note that this version of the article is for women ages 20–44.]
If the thought of finding a lump in your breast scares you, you’re not alone: After all, many of us know someone who has had breast cancer. But some of us are so frightened that we avoid getting mammograms as recommended—the very habit that could save our lives if breast cancer develops. If you’re in that group, you’ll be glad to hear that four out of five breast lumps investigated turn out to be noncancerous.
But if they’re not cancer, what are they? The most common causes of breast lumps are described below.
1. Fibrocystic breast changes are the most common cause of benign (noncancerous) breast lumps. Women who have this condition develop one or more solid or fluid-filled lumps. In a small number of cases, the lumps increase in size and tenderness five to seven days before each menstrual period and shrink again when menstruation ends.
Experts estimate that up to half of all women between ages 35 and 50 develop fibrocystic breast changes. It’s so widespread among the premenopausal population, in fact, that some healthcare professionals consider it to be a normal condition rather than an actual disease. Reducing your caffeine intake may help relieve the symptoms.
If you have one or more lumps that don’t disappear after the end of your period, see your doctor. Although fibrocystic lumps don’t pose a threat to your health and aren’t considered a risk for cancer, they’re often difficult to distinguish from malignant breast lumps. As a result, they should always be professionally evaluated.
2. Fibroadenomas are most common in women under age 30 and are twice as common in African-American women. These smooth, solid masses feel much like marbles and move easily. Most doctors recommend removing them because they won’t go away on their own and may continue to grow—particularly during pregnancy and breastfeeding. Another reason for removal: It’s the best way to confirm that the lump is indeed a fibroadenoma and not a malignant mass masquerading as one.
3. Cysts are fluid-filled sacs that tend to get bigger and more sensitive to the touch before a woman’s menstrual period. They can be either soft or firm and almost any size—from a fraction of an inch to nearly the size of a golf ball. They’re typically found in both breasts and appear most often in women between ages 35 and 50. Your doctor may use a thin needle to draw the fluid out of a cyst to collapse it. If the fluid is cloudy or colored, or if the lump turns out to be solid, the material may be analyzed further.
4. Lipomas occur most often in premenopausal women. These painless lumps, composed of fatty tissue, are soft and slow-growing. Like cysts, they move freely and vary in size. Although they’re noncancerous, most experts recommend removing a sample of the tissue or the entire lump to make sure it is indeed a lipoma.
5. Intraductal papillomas are tiny lumps that occur in the milk ducts near the nipple. They usually affect women in their 40s and can cause a watery or bloody discharge from the nipple. As with other benign lumps, intraductal papillomas should be removed to be sure they’re noncancerous.
6. Mastitis is an infection most often experienced by nursing mothers. The breast appears red and feels warm. A sore lump usually is present, as are flu-like symptoms, such as fever and achiness. Applying heat, getting plenty of rest and nursing frequently on the infected side often will clear the infection. However, if fever is still present after 24 hours, seek medical attention. In most cases, antibiotics will heal the infection.
7. Traumatic fat necrosis occurs occasionally in older women and in women with very large breasts. This condition can result from a bruise or a blow to the breast. The injury causes the fat in the breast to form round, firm lumps, which are sometimes tender.
A final word of caution: If you happen to find a lump, don’t use these descriptions to try to diagnose it yourself. Remember, there is no substitute for a professional exam by your doctor, and fortunately, four out of five breast lumps turn out to be noncancerous.