I know fevers are the body’s method of killing foreign bacteria and infections and such by raising the body’s temperature, but how exactly does it raise the body’s temperature?
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two primary methods. First, your blood vessels constrict, causing your body to retain heat in its core, drawing it away from the skin. This is in fact why you can both feel cold and feverish at the same time, your constricted blood vessels are limiting blood flow to the skin, where body heat is lost to convection to the air around you. Since there’s less blood flow to your skin, your natural body heat doesn’t go to the surface as much and be lost to exposure to normal elements
Secondly, muscle spasms (aka “shivering”) create muscle work, which burns calories and generates heat as a byproduct.
The shivery cold feeling you get while also having a fever is literally what’s causing the fever. Involuntary muscle use and vasoconstriction that’s preventing body heat loss
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