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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It’s not just the fever. When your immune system goes into full, to fight an infection, it uses up a lot of energy. On top of that, part of the immune response is to intentionally make you feel achy and tired, so that you will limit your activity and rest, so that your immune system can fight the infection better.
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