Which condition is associated with the inflammation of breast tissue?

Mastitis is the condition associated with the inflammation of breast tissue, often affecting women who are breastfeeding, although it can occur in other contexts as well. This condition typically arises due to bacterial infection, leading to swelling, pain, and redness of the breast tissue. Symptoms often include a painful lump, warmth in the affected area, and sometimes fever. The inflammation is a response to infection or obstruction of the milk ducts, illustrating the body's immune reaction to combat harmful pathogens.

The other conditions listed are associated with inflammation in different parts of the body. Appendicitis refers to the inflammation of the appendix, gastritis involves inflammation of the stomach lining, and dermatitis refers to inflammation of the skin. Each of these conditions has distinct causes, symptoms, and implications, making mastitis uniquely linked to the breast tissue specifically.