Mastitis is a disease that affects the udder of female mammals, including cows, goats, and sheep. It is an inflammation of the mammary gland, which can be caused by bacterial infections, injury, or other factors. Mastitis can cause swelling, pain, and changes in the appearance and quality of milk produced by the affected animal. If left untreated, it can lead to serious health problems and even death in some cases. Therefore, prompt diagnosis and treatment are important for the health and well-being of both the animal and the people who depend on their milk.