An axillary body temperature of 35.9°C can be a normal body temperature. Normal body temperature is not a specific temperature point, but a range of temperatures, usually 36-37°C for normal axillary body temperature. This standard, like other clinical indicators, is a value based on most people. There are very few people who may fluctuate 0.1-0.2℃ above or below this value without any discomfort, and this temperature is normal. For some patients who are prone to sweating or are weak and usually less active, especially the elderly who have a low metabolic rate, the body temperature may also be low. Body temperature also varies within a day, with a low body temperature between 2 and 6 am. Low body temperature may also occur when the outdoor temperature is low.