I sweat on my head only when eating anything.it does not even have to be spicy food.even just thinking or smelling spicy food i immediately sweat. i have a clean shaven head and i sweat only on my head. no pain at all, no discomfort.

You may have: trained your scalp to sweat when you eat. It may be one of those inadvertent reactions to food that you may have developed since you were a youngster. Perhaps you were used to eating outside where the sun shone and heated your head, and now even if you are not outside, with the heat of the sun, when you eat your skin reacts as if you had been. It's a phenomenon called conditioning.