Usually, 17-year-old teenager body temperature 37.4 degrees is not normal, belongs to the low fever, but do not rule out special circumstances. Normal axillary body temperature range of 36-37.2 degrees, between 37.3 ~ 38 ℃ belongs to a low fever, so the 17-year-old teenager temperature 37.4 degrees usually belongs to the category of low fever. However, it should be noted that, if the teenager is in the environment temperature is relatively high or after strenuous exercise, there will be a temporary increase in body temperature, body temperature may reach 37.4 degrees, usually calm for a period of time and then re-measurement of body temperature, more will return to normal. If the temperature is still 37.4 degrees when measured several times in a quiet state, it can be determined as low fever, and it is recommended to consult a doctor in time, and if necessary, do blood routine and other tests to clarify the cause of low fever, and symptomatic treatment.