Your body has a kind of built-in thermostat that it can regulate. When you get a fever, the first thing that happens is that the thermostat gets cranked up a few notches when the body decides it needs to be hotter e.g. to kill off an infection more effectively. The body then suddenly finds itself at an actual core temperature lower than the “set” temperature of the thermostat. This produces the feeling of cold forcing you to get under a blanket, drink hot beverages etc. in order to raise your core temperature to the “set” temperature as fast as possible. So that feeling is the way your body communicates to you what it needs to be done right now. You also get involuntary shivers which are a way of raising core temperature as well (rapid muscle movement spends their stored energy and releases heat).
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