The most accurate time to measure body temperature is in the early morning, when you are awake and quiet, on an empty stomach, or in the evening before going to bed. It is recommended not to take temperature measurements after stress, emotional excitement, exercise, or after maintenance, because the human body temperature fluctuates with the daytime and nighttime changes in the morning and evening, and is affected by many factors such as the environment, so the temperature measured at each time may be different. In addition, the human body temperature is balanced by the process of heat production and dissipation, and is regulated by the hypothalamus thermoregulatory center, so a body temperature that is too high or too low will have a negative impact on the body.