Mastitis occurs when bacteria found on skin or saliva enter breast tissue through a milk duct or crack in the skin. These factors increase the risk of a nursing mom developing mastitis:
Cracked, sore nipples.
Improper latching technique or using only one position to breastfeed.
Wearing tight-fitting bras that restrict milk flow.
Many people with mastitis develop a wedge-shaped red mark on one breast. The breast may be swollen and feel hot or tender to the touch. You may also experience:
Breast lumps.
Breast pain (mastalgia) or burning sensation that worsens when your baby nurses.
Fatigue.
Flu-like symptoms, including fever and chills.
Headaches.
Nausea and vomiting.