Sometimes they can become clogged. If not treated it will become very painful and can turn into something worse. Always call your doctor if you think there is a problem and get it taken care of before it gets to this point.
Any part of your body can be infected. An infection occurs when any foreign agent invades your body. Milk ducts are vulnerable because they have direct contact with the outside environment.
Breast infections can occur in women who are breastfeeding. Most commonly, breast infection is caused by bacteria on the skin entering through a opening, such as the nipple.