Breast Infection (Mastitis)

A breast infection (mastitis) is usually caused by common bacteria found on the skin. Breast infections can cause breast pain, swelling, redness, lumps, and fever. While mastitis is more commonly associated with breast feeding, be aware that it can occur at any time.

Once diagnosed, mastitis is usually treated with antibiotics. An ultrasound may be recommended to check for the presence of an abscess (a collection of pus) in the breast that may require drainage. A follow up ultrasound may also be recommended in order to ensure that all signs of infection have resolved with treatment.

Very rarely, mastitis can lead to a life-threatening infection called sepsis. Even more rarely, mastitis can be related to underlying breast cancer.

Call your healthcare provider if you have signs of a breast infection, including pain, local redness or other skin changes, swelling, nipple discharge, or fever.