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Why does spicy food cause mild pain or hot sensation when the food isn't temperature hot?

Asked by Fernspider (3597points) August 19th, 2009

I have often wondered:

a) Why the sensation experienced when consuming spicy food is considered “hot” when the physical temperature is actually not.
b) What actually causes the discomfort or “hotness”.

Does anyone know why spicy food feels “hot” in your mouth even when it is temperature warm or cold?

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