Pregnancy can cause an increase in body temperature in women, usually about 0.3 to 0.5 degrees Celsius in most women. The increase in body temperature after pregnancy is closely related to the rise in progesterone levels in the body after pregnancy. Progesterone not only converts the endometrium from the proliferative phase to the secretory phase, but also acts on the hypothalamic thermoregulatory center. Progesterone excites the hypothalamic thermoregulatory center, causing the basal body temperature to rise by at least 0.3 degrees Celsius. If a fertilized egg is formed after ovulation, the corpus luteum will secrete more progesterone to thicken the endometrium and provide good endometrial conditions for the fertilized egg to implant. After the fertilized egg is laid, more progesterone is secreted to protect the fetus, resulting in a high body temperature, which usually lasts until the end of the pregnancy, or even after the end of the pregnancy, because the body progesterone level is still high. In conclusion, it is normal for women to have an elevated body temperature during pregnancy.