Normally, when an area of skin is touching something and is giving away its heat energy because its warmer than that thing it’s touching, we sense cold or coolness from that thing or from within ourselves. The bigger the temperature difference the faster the heat gets transfered and the faster the transfer the colder we feel. When have a fever, we are warmer than normal and the temperature difference between our skin and what it’s touching (the air) is also larger than normal. This makes us sense that we are colder than normal despite actually being pretty warm.
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