Mastitis is a painful infection of the human female breast tissue that is characterized by swelling of the breast tissue, redness, and pain. Mastitis is quite common among breastfeeding human females. Mastitis’ severity may range from one nursing mother to another. There are severally researched and proven preventive measures of curbing mastitis while breastfeeding. This condition may affect one’s health. Breastfeeding may be difficult at this time, and the sooner Mastitis is diagnosed and treated, the better it would be for both the mother and the child. This section will discuss in detail the scientifically backed symptoms, causes, and treatment of mastitis for breastfeeding women. Preventive measures will also be outlined in this section.