That fever didn’t come out of nowhere. Your body creates heat by expending energy. The most efficient way of doing that is muscle contraction. Those chills you feel when your fever gets high enough? It’s the same thing as the shivering you’re doing when you’re cold. This is why high fever is usually accompanied by severe aches, pains, and spasms in your leg and arm muscles… They’re tired.
As the other posts mention, the histamines, lactic acid build up (because of muscle work) and general warfare going on in your body aren’t helping with things either.
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