Rectal, ear or temporal artery temp: 100.4 (38 C) or higher Oral temp: 100 F (37.8 C) or higher Armpit temp: 99 F (37.2 C) or higher Most individuals’ body temperatures fluctuate and change during the course of the day. It is often slightly lower within the early part of the day and slightly higher during nighttime, and can vary with kids as they run around, jump, and play.
There are instances when the hypothalamus will just have to regulate, to increase or even decrease, the body temp. The body responds via fluctuating temperature in response to an infection, illness, or an external cause. Why? Doctors believe that increasing the warmth may be a way for our body to defend itself against germs that cause infections, making it an uninviting place for them.
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