Breast pain or tenderness is usually hormonal. The breasts are more painful during adolescence, pregnancy, or at certain times of the menstrual cycle. Outside the nursing period, pain in the breast requires investigation by palpation, looking for a mass that will need to be more accurately identified using an ultrasound, called a mammography. In women who are nursing, breast pain is more common and is often localized in the nipple: it may be due to a bad position when breastfeeding or poor latching-on by the infant, responsible for chapped nipples. A breast engorgement, inflammation of the mammary gland, or breast abscess can also cause breast pain.