You might not spend any time thinking about it, but all day long, your body is sending all sorts of signals to your brain that describe the world around you. Smithsonian Magazine reports that the nerve endings responsible for telling your body what temperature it is are called thermoreceptors. They usually react only to temperatures ranging from hot to cold, but occasionally, they react to chemicals as well. This is why hot peppers cause you to break out into a sweat and toothpaste feels crisp and cool in your mouth.
Nobody knows for sure why the paradoxical cold phenomenon exists as it does not appear to have any evolutionary benefits whatsoever. All scientists have been able to figure out is that something happens to the thermoreceptors when the temperature reaches 113 degrees Fahrenheit (and sometimes beyond) that causes them to malfunction, telling your brain that what is hot is actually cold.
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