Fever during breastfeeding is usually caused by mastitis or upper respiratory tract infection, so antibiotics are usually needed for anti-inflammatory treatment and, if necessary, surgical excision of the breast abscess to drain the pus. For women who are breastfeeding, acute mastitis often results in the accumulation of milk in the breast because the milk is not drained in time, and prolonged milk accumulation can cause sterile inflammation, resulting in localized redness, swelling and pain in the breast, and may even cause fever. The accumulation of milk for too long may also lead to localized pus in the breast. Therefore, if a woman has mastitis leading to fever, she must go to the hospital gynecology or breast surgery to check the ultrasound, and also check the blood routine to see the severity of the infection, and the doctor will consider anti-inflammatory treatment by oral or intravenous antibiotics alone according to the infection, and at the same time empty the milk completely. However, if the infection is more serious, anti-inflammatory treatment with antibiotics may be considered, which is very effective in anti-inflammatory treatment, and it is also necessary to empty the breast milk to do so. If the mastitis has led to localized pus in the breast, then a local incision of the breast to drain the pus should be considered. If the infection is caused by an upper respiratory tract infection, symptomatic antiviral or anti-inflammatory treatment is required. Therefore, the cause of fever during breastfeeding needs to be identified first, and then targeted treatment can be given after the cause is found. If the fever is caused by a cold, it is recommended to take more rest, drink more warm water, and apply antipyretics or antiviral or antibiotic treatment if necessary. If it is mastitis or upper respiratory tract infection, the treatment will be as described above.