Acute mastitis usually lasts for about a week and varies depending on the individual. Acute mastitis is an inflammatory reaction of the mammary glands that occurs 3 to 4 weeks after delivery, based on milk stagnation due to various reasons. Acute mastitis is categorized as milk stasis, acute inflammation and breast abscess. Recurrent fever may be due to incomplete emptying of the milk, which is ideal for bacterial reproduction, and if stagnant for a long time, it will become a breeding ground for bacterial cultivation, and may also be due to a decline in autoimmunity, leading to recurrent inflammation. If the cause of the disease is removed, the body’s inflammatory response will naturally subside, and there will be no fever. The patient should ensure adequate rest, effective emptying of breast milk, under the guidance of a professional doctor, follow the doctor’s instructions to use antibiotics, pain medication, maintain an optimistic attitude, and actively cooperate with the treatment.