Fever in pregnant women is a normal physiological phenomenon if there is only a slight increase in temperature. However, if it is accompanied by other symptoms or a higher rise in body temperature, it is important to consider that there is a disease problem. Pregnancy is a special period for women, because hormonal changes may lead to higher body temperature: 1, hormone level changes: due to the increase in the secretion of pregnancy and estrogen, of which progesterone has the effect of regulating body temperature, there can be an increase in body temperature of 0.5-1.0 ℃, usually body temperature ≤ 37.3 ℃ is a normal physiological phenomenon; 2, endocrine changes: endocrine changes during pregnancy are large, producing shocks to themselves, causing emotional Unstable, can lead to transient fever phenomenon, the body temperature drops to normal after the emotion calms down. If the body temperature is >37.5℃, it is necessary to seek medical advice and follow medical prescriptions for active treatment, forbidding self-medication: 1. disease factors: infectious diseases are more common, including fever caused by various pathogens such as bacteria, viruses, Mycoplasma pneumoniae and other infections, common viral colds, urinary tract infections, etc.; 2. lifestyle: pregnant women who do not pay attention to regular work and rest, unclean diet, can make the immune system decline and induce infection, thus cause fever. Frequent visits to crowded and unventilated places are also prone to respiratory infections, which can cause fever; 3, environmental factors: the outside environment is too hot and pregnant women are too tightly dressed, which can cause heatstroke and fever in pregnant women.