Your body has an internal thermostat, kinda like a house thermostat.
If you were to suddenly turn your house thermostat up from 20 C to 25 C, the house would suddenly go “oh no, I’m colder than I should be. I need to warm up so I can reach 25 C.” And it pumps heat into the house.
That’s the same reason you feel cold when you have a fever. Your body is telling you you need to be at 38 C instead of 36 C, and it triggers the feeling of being colder than you should be. That prompts you to seek out heat to help warm you up.
The extra heat can help kill pathogens, but your body also struggles and breaks down if it’s too hot.
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