There is no thermometer, you can take the temperature of the hands, feet, forehead comparison, in general, the temperature of the hands and feet of the fever will not be hot, and there will be cold hands and feet, but the forehead is relatively hot; another aspect of the human sensory system is very sensitive, although it may not be a high fever, but the human sensory system will react, while feeling the head is hot, the other are cool, and then there You can breathe through your nostrils and feel it. The human respiratory system will have a higher body temperature when the fever is high, resulting in louder breathing and higher than normal exhalation temperature. So these can play a supporting role in determining body temperature.