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Breast Mass


A breast mass is a lump or growth in your breast or underarm. A cyst (fluid-filled pocket), an injury, or changes in your breast tissue are the most common causes. A breast mass can also be caused by cancer. You must follow up as directed to find the cause of your breast mass.


Follow up with your healthcare provider as directed:

You may need to return for more tests. Write down your questions so you remember to ask them during your visits.

Continue breast self-exams:

Check your breast for changes in size, shape, or feel of the breast tissue. Check under your arms and all around your breasts. If you have monthly periods, examine your breasts after your period is over. Contact your healthcare provider if you notice any changes in your breasts. If you have questions, ask for more information on how to do a breast self-exam.

Contact your healthcare provider if:

  • Your breast mass returns or grows larger.
  • You have pain in your breast or underarm.
  • You have nipple discharge.
  • You notice other changes to your breasts or nipples, such as dimpling or a rash.
  • You had an aspiration and you have redness, pain, swelling, or warmth near the aspiration site.
  • You have a fever.
  • You have questions or concerns about your condition or care.

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The above information is an educational aid only. It is not intended as medical advice for individual conditions or treatments. Talk to your doctor, nurse or pharmacist before following any medical regimen to see if it is safe and effective for you.