According to the public health network, the change of female hormone level and the stimulation of immune system during physiological period can lead to a slight increase in body temperature, but generally it will not exceed 37.3℃. Therefore, if the body temperature is 37.5℃, although it is caused by physiological reasons, it is not normal. It is recommended to observe closely, drink plenty of water, keep warm and have a rest. If there is persistent low-grade fever or other symptoms, it is recommended to seek medical advice in time.