The duration of fever in acute mastitis is related to the degree of fever in women and the promptness of treatment. Acute mastitis, which mostly occurs in primiparous women, is an acute purulent inflammation of the mammary glands due to poor milk drainage and bacterial multiplication caused by milk stagnation. Acute mastitis fever indicates an increase in the degree of inflammation and should be treated promptly. If the body temperature is below 38.5℃, you can drink more water and use warm water to cool the area near the aorta or use alcohol to cool the body by rubbing it. If the body temperature exceeds 38.5℃, you should go to the hospital for treatment promptly, treat the cause, apply antibiotics systemically by oral or intravenous infusion under the guidance of a doctor, and use antipyretic drugs, which may lead to secretion of drugs into the breast milk if they are not administered correctly. After the occurrence of acute mastitis during breastfeeding, the affected breast should stop breastfeeding, try to let the milk drain, do not give it to the baby, the healthy side of the breast can still breastfeed.