The normal oral temperature is 36.3°C-37.2°C. Therefore, a sublingual temperature of 37.5°C is not normal and is considered hypothermic. It is recommended to measure again at intervals to continuously monitor temperature changes. Firstly, it should be ensured that the measurement is done in a correct way to avoid measurement errors. When measuring the oral temperature, the mercury end of the mouth gauge needs to be placed diagonally at the hot fossa under the tongue, with the mouth closed but avoiding biting with the teeth and breathing through the nose, and the temperature is removed for observation after holding for 3 minutes. Secondly, oral temperature is also related to gender, age, measurement time and muscle activity. Body temperature and mouth temperature in the consistency, if the body temperature increases, the mouth temperature will also increase accordingly, so the sublingual temperature of 37.5 ℃ suggests an increase in body temperature, may be due to the following reasons: 1, physiological conditions: adult women in the ovulation of the body temperature will be slightly higher, and newborns due to their own thermoregulatory function is poor, body temperature will fluctuate with the environment. After exercise or physical labor, the body will continue to produce heat, at this time the measurement of body temperature will also appear high body temperature. In addition, medications, environmental temperature, or more emotional stress or excitement can affect body temperature changes and lead to the occurrence of hypothermia. Generally, after removing the trigger, the sublingual temperature will return to the normal range; 2. Pathological conditions: If the body temperature shows a continuous increase, or fluctuating fever, consider whether it is caused by disease factors. Commonly, there are tuberculosis infectious diseases, such as pulmonary tuberculosis, intestinal tuberculosis, tuberculous pleurisy, etc. Chronic infectious diseases in other parts of the body, such as chronic pelvic inflammatory disease and chronic cholecystitis, may also cause hypothermia. In addition, some non-infectious diseases, such as hyperthyroidism, rheumatoid arthritis, systemic lupus erythematosus, leukemia, etc., may also cause hypothermia in the body. When sublingual temperature of 37.5℃ is found, there is usually no need to worry excessively. It can be relieved at home by physical cooling such as drinking plenty of water and putting wet towels on forehead. If the sublingual temperature does not return to normal after physical cooling, or even tends to rise, you can take antipyretic drugs. If physical cooling and medication are not effective, it is recommended to go to the hospital to improve the blood routine, C-reactive protein and other tests to identify the specific cause of the fever and then carry out targeted treatment.