Fever in pregnancy may be a physiological increase in body temperature caused by increased hormone levels in the body, or it may be a manifestation of pathogenic infection. After pregnancy, the pregnant woman’s body estrogen, progesterone, human chorionic gonadotropin and other sex hormone levels increased significantly, may have a certain impact on the thermoregulatory center, may cause a slight increase in body temperature. Most of them are normal physiological phenomena and generally do not require special treatment. If a pregnant woman is infected by bacteria, viruses and other pathogens, these pathogens may act as a pyrogen to affect the thermoregulatory center’s adjustment of body temperature, which may cause an abnormal change in the thermoregulatory point, and may lead to a good fever in pregnancy. Good fever in pregnancy is recommended for further obstetrical consultation.