A feeling of fever inside the breast may be due to the following conditions: firstly, it may be due to increased local arterial blood flow in the breast, which is often seen in acute inflammation or chronic inflammation of the breast, such as inflammation of the breast ducts and plasmacytoid inflammation of the breast, because the local tissues in the breast will have an increased temperature during the attack. Secondly, there may be abnormalities or lesions in some areas of the skin inside the breast, more commonly known as nerve root inflammation, where the nerves between the ribs become infected and the patient feels warm. In addition, other breast diseases may also cause a feverish feeling inside the breast, once this symptom occurs it is best to go to a breast specialist for further examination and then targeted treatment is better.