12-year-old children body temperature 35 degrees 7, if the environmental problems, detection means and the state of the child at the time and other physiological factors determine this situation is normal; may also be malnutrition and other causes of hypothermia, hypothermia is not normal. People at room temperature, the usual time, the normal axillary body temperature is 36.3-37.3 ℃, there are individual differences. 12-year-old children body temperature of 35 degrees 7, if the measurement is accurate, for low body temperature. 1. Environmental issues: the environmental temperature affects the measurement temperature of the ear thermometer. As the ear thermometer mainly takes infrared sensor to measure the body surface temperature. Body surface temperature is greatly affected by the environment. In this case, it is recommended to use a mercury thermometer to review the body temperature. 2. Means of detection: Generally speaking, the forehead temperature is relatively low, the ear temperature is high relative to the forehead temperature, the rectal temperature is closest to the core temperature, relative to other parts of the temperature, the rectal temperature is the highest. 3. The state of the child: if the child sweats, it will affect the temperature measurement, you need to wipe off the armpit sweat, and then use the thermometer to measure. 4. Pathological hypothermia: a 12-year-old child with a temperature of 35 degrees 7, excluding measurement problems, needs to seek medical attention to check the cause. Common pathologic causes include hypothermia after glucocorticoid use, malnutrition, and hypothyroidism. In a 12-year-old child with a temperature of 35 degrees 7, physiologic causes have been ruled out, and medical attention is recommended to check the cause.