Actually, its kinda true. When you have a fever, your body temperature rises. When your body temperature us higher in relation to the room temperature it makes you feel cold. That's why when you have a fever, you're cold.
English
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You may [u]feel[/u] cooler but you aren't cooling down in reality. It's like tricking your mind
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That's what I tried to get across, you're not getting cooler, just feels that way