Body temperature less than 35.0 ℃ is abnormal, but should be excepted in the temperature measurement process of irregular operation. First of all, the temperature of the armpit is generally taken to replace the internal temperature of the body, and the temperature should be measured early in the morning, fasting, and resting state. Secondly, the patient’s sweat under the armpits should be wiped off during the temperature measurement, so as to avoid the evaporation of sweat affecting the degree of body temperature. Finally, the thermometer should be kept in contact with the armpits for at least 10 minutes, so that the measured temperature is relatively accurate. If this is not done properly, it is likely that the temperature will be low. If the temperature is still less than 35.0°C despite the standardization, you should go to the hospital for further examination.