👉 Mastadenitis is a type of inflammation that can occur in the chest, often due to an allergic reaction or infection. It generally involves swelling and pain in the chest region. Mastadenitis can be caused by various factors such as allergy to dust, pollen, or pet dander, as well as infections like pneumonia or bronchitis. Treatment may include anti-inflammatory medications, antibiotics, and sometimes corticosteroids if necessary.