The best department to consult for mastitis during breastfeeding if you have a fever should be general surgery or breast surgery. Mastitis during breastfeeding is a common and frequent disease in general surgery and is not directly related to obstetrics or gynecology. Lactation mastitis is mainly due to the possibility of bacterial multiplication and overgrowth due to milk stagnation, which eventually induces mastitis. In the case of fever during lactation mastitis, symptomatic, supportive and anti-inflammatory treatment can be taken first. Selecting sensitive antibiotics, including penicillin ones or cephalosporins, amoxicillin or ceftriaxone sodium are clinically used, which are all more effective for mastitis during lactation. For patients with fever, physical cooling or the application of antipyretic drugs such as Nimesulide may also be appropriate to reduce the fever. If a more serious acute suppurative mastitis develops, it is also necessary to go to surgery for incision and drainage in a timely manner, and to change the incision dressing regularly after surgery to gradually cure the mastitis.