When is a breast lump more than a lump?

By Mayo Clinic staff

A breast self-exam is an inspection of your breasts that you do on your own. To help increase your breast awareness, you use your eyes and hands to regularly observe the look and feel of your breasts.

Many breast changes detected during a breast self-exam have benign causes. This means they are not caused by cancer. Other changes may signal something serious like breast cancer.

A breast self-exam that you do for breast awareness helps you understand the usual look and feel of your breasts.

These self-exams aren't as effective as routine mammograms in detecting cancer or improving survival for women who have breast cancer.

Still, many healthcare professionals believe there is value in women becoming familiar with their breasts so they understand what's typical for them and can promptly report changes to their healthcare teams.

What does a breast lump feel like?

A breast lump is a growth of tissue that develops within your breast. It may be described as a mass, growth, swelling, thickness or fullness. A breast lump can vary in the way it looks and feels.

Many women find lumps or changes in their breasts at various points in their menstrual cycles. These are typical changes that occur, and finding a change or lump in your breast is not a reason to panic. Breasts often feel different in different places. The look and feel of your breasts will also change as you age.

Watch for these breast changes:

• A distinct lump with definite borders.
• A thickened, slightly more prominent area in your breast that's different from surrounding breast tissue.
• Breast pain or tenderness.
• Nipple changes, such as a nipple pulled inward (nipple inversion) or spontaneous fluid discharge from your nipple.
• One breast that's noticeably larger than the other.
• Other breast changes, such as redness, dimpling or pitting of the skin.

Sometimes, a breast lump is a sign of breast cancer. That's why you should seek prompt medical evaluation. However, many breast lumps result from noncancerous, or benign, conditions like benign breast disease, especially in women under 50.

Your family's cancer history can affect your cancer risk and the chance that a lump might be a more serious concern.

What causes breast lumps?

A breast lump can develop as a result of conditions, such as:

• Breast cancer
• Breast cysts
• Fibrocystic breasts
• Hamartoma, a noncancerous tumor in the breast
• Injury or trauma to the breast
• Mastitis

Can a mammogram determine what is causing a breast lump?

In some cases, yes. A mammogram can help your healthcare team determine the cause of the lump and if additional treatment is necessary. They also may recommend additional tests and procedures, such as ultrasound or biopsy.

Early detection and routine mammogram screenings are key to reducing death from breast cancer. That's why Mayo Clinic recommends that women with an average risk of breast cancer start screening mammograms yearly at 40. Average risk of breast cancer means women with no family history of breast cancer and no other risk factors for breast cancer. Women with a family history or other risks may need earlier or more frequent mammograms at the guidance of their healthcare team.

When should a breast lump be evaluated?

Any breast symptoms, such as a breast lump, nipple discharge or breast pain, should be evaluated by a medical professional.

Schedule an appointment with your healthcare team if you notice:

• A breast lump is new or unusual and feels different from the surrounding tissue or tissue in your other breast.
• A breast lump doesn't go away or gets bigger after your next menstrual period.
• A breast lump changes and becomes bigger, firmer or more defined from surrounding breast tissue, especially if you have not had it examined by a healthcare professional previously.
• Bloody, possibly spontaneous, discharge from your nipple.
• Skin changes on your breast, such as redness, crusting, dimpling or puckering.
• Your nipple is turned inward, or inverted, although it typically isn't positioned that way.

Your healthcare team may recommend additional tests and procedures to determine the cause of your breast changes. — Bongi Rudder, M.B.B.S., is a Mayo Clinic oncologist in Mankato and New Prague, Minnesota.

Learn more

Learn more about breast self-exams, breast lumps and breast cancer.

Join the Breast Cancer Support Group on Mayo Clinic Connect, an online community where patients and caregivers can connect.

Also, read these articles:

• "Breast lump or breast changes: Early evaluation is essential"
• "Breast health during menopause"
• "Beyond the basics: Exploring advanced breast cancer screening options"
• "Why Black women should consider screening for breast cancer earlier"
• "Breast cancer in Hispanic women in the US, importance of screening"

A version of this article was originally published on the Mayo Clinic Health System blog.