There are many reasons for postpartum fever: 1, the most common is puerperal infection, once the puerperal infection will cause serious consequences, if the fever reaches 39 ℃, go to the hospital as soon as possible to check and actively give anti-inflammatory treatment. 2, the common reason is due to the local inflammation of the mammary glands, due to the improper care of the mammary glands lead to the local mammary ducts appear obstruction, so that the secretion of breast milk is relatively more and the stagnation will lead to local inflammatory reaction. The most common cause is the inflammation of the breasts, which will lead to the local inflammatory reaction, the symptoms of fever, localized pain, localized redness and swelling. 3, due to the lack of attention to warmth caused by the upper respiratory tract infection, can also cause fever, it is recommended that you go to the hospital as soon as possible to do a checkup. According to the results of the examination must do the appropriate treatment, in order to make the body temperature return to normal as soon as possible.