It’s some what backwards, you get a fever because you’re feeling cold.
The immune system works better at a higher temperature (thought the rest of the body works worse at that temperature).
So when your body detects a bad illness, it tells a lot of things in your body that it’s currently too cold, so it does all the stuff to warm you up.
Stuff like shivering, and feeling cold so you go seek out a warm blanket.
Because you feel cold when you’re not actually cold, your body heats up, creating a fever, which helps your immune system work better to fight the illness.
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