Blocked milk ducts may develop during breast-feeding when the breasts become too full. This may also occur if:
You can help unblock milk ducts by:
Mastitis is an infection in the breast that may be caused by a blocked milk duct or cracked nipples. If you have mastitis, you need treatment from a health professional that often includes taking prescription antibiotics.
It is also important to rest and drink plenty of fluids. Continue breast-feeding on both breasts throughout your treatment. For more information, see the topic Mastitis While Breast-Feeding.
WebMD Medical Reference from Healthwise