Hot food. The roof of mouth is sensitive. Avoid eating hot foods. Note:even scratchy food like captain crunch can irritate the palate. Also, certain foods which are acidic like tomato paste can irritate the mouth. Finally, some people have allergy which causes irritation. Foer example, I am mildly allergic to bananas (common with ragweed pollen allergy)and my palate itches after eating.
Don't eat hot pizza. You could have a very sensitive mouth or allergies. If the reason for this is not that the cheese was very hot and you burned yourself, then you might have an allergy to thay type of food. Food allergies arenot uncommon. Try rinsing with aleo vera juice to relieve the hurt.