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Mastitis (breast infection)

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Last updated June 11, 2022

Mastitis (breast infection) quiz

Take a quiz to find out what's causing your mastitis (breast infection).

Mastitis (breast infection) quiz

Take a quiz to find out what's causing your mastitis (breast infection).

Take mastitis (breast infection) quiz

What is Mastitis?

Mastitis is an infection of the breast tissue that causes breast pain, swelling, warmth, and redness of the breast. Mastitis affects about 10% of women who are breastfeeding (lactation mastitis). It is usually caused by a blocked milk duct, which causes bacteria to multiply. The bacteria normally live on the skin or in the mouth of a nursing infant and are transferred to the breast during nursing.

Mastitis sometimes can occur in women who aren't breastfeeding.



You should see a doctor to confirm your diagnosis and get treated, as mastitis can cause women to stop breastfeeding because of the pain. Also, bacterial infections will need to be treated with antibiotics.

Treatment includes changing breastfeeding techniques. Your doctor may recommend that you see a lactation consultant.

You can reduce your risk of mastitis with complete emptying of the breast when breastfeeding or pumping, and by improving your breastfeeding technique.

Ready to treat your mastitis (breast infection)?

We show you only the best treatments for your condition and symptoms—all vetted by our medical team. And when you’re not sure what’s wrong, Buoy can guide you in the right direction.
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Dr. Rothschild has been a faculty member at Brigham and Women’s Hospital where he is an Associate Professor of Medicine at Harvard Medical School. He currently practices as a hospitalist at Newton Wellesley Hospital. In 1978, Dr. Rothschild received his MD at the Medical College of Wisconsin and trained in internal medicine followed by a fellowship in critical care medicine. He also received an MP...
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