It doesn’t seem like a huge difference to me but even a 1 degree increase of body temp can make you so tired and have fever. Why is that?
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Your body has an internal set point to maintain temperature. There is some minor fluctuation throughout the day, but usually no more than +/- 1 degree.
When you have an infection, your body may decide to raise the set point. This has the huge benefit of increasing the effectiveness of the immune system.
Mounting an immune response takes up a lot of the body’s resources. This, and the damage being done by the invader, are what make you feel lousy.
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