Breast heat and pain may be caused by breast contusion, acute mastitis, lobular hyperplasia of the breast and so on. 1. Mammary gland contusion: when the breast is contused due to the action of external force, the skin area will show bruises and bruises, causing localized fever and pain. 2. Acute mastitis: Acute mastitis is most common in breastfeeding women, and is generally a pathological process in which bacteria infect the breast tissue through the cracked nipple, resulting in a suppurative infection of the breast tissue. In the early stages of the infection, the breasts are swollen and uncomfortable, accompanied by a localized increase in skin temperature of the breasts. 3. Lobular hyperplasia: Lobular hyperplasia is a kind of breast hyperplasia, usually related to endocrine disorders. If the patient suffers from lobular hyperplasia of the breast, before menstruation, the breast is prone to swelling and pain, sometimes accompanied by fever, after menstruation, the symptoms can be relieved. When patients have symptoms of breast fever and pain, they should go to the hospital in time to clarify the cause of the disease and receive reasonable treatment under the guidance of the doctor.