Mastitis: Inflammation of one or more mammary glands within the breast, usually in a lactating woman. Mastitis can be felt as a hard, sore spot within the breast. Mastitis can be caused by an infection in the breast or by a plugged milk duct. Treatment includes resting and applying warm compresses to the affected area, and for those who are lactating, nursing or expressing milk 'frequently.
Reviewed on 10/30/2018
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