When you get sick, the thermostat in your body is increased from 98.6F to >100F. This is caused by whatever is making you ill. When you are feeling cold, instead of turning the thermostat up, it tells your body to shiver and constrict blood vessels to keep heat in.
The reason why you don’t want that thermostat being turned up when you’re just feeling cold is because getting too hot is bad. Too much heat breaks things down that shouldn’t be broken down. That’s why there are other mechanisms for your body to warm itself up.
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