Sore mouth or throat A sore mouth or throat can make eating difficult. Medications, chemotherapy, radiation therapy, or mouth infections can cause soreness. Eat bland, mild-flavored foods. Spicy or salty foods can irritate soreness. Eat lukewarm or cold foods.
Hot food can irritate soreness.
Puree foods before you eat them. Most cooked foods can be pureed in a blender or food processor. Avoid carbonated beverages or drink them only after they have gone flat. Carbonation can irritate soreness. Drink soups or other liquids from a straw or a cup instead of a spoon to keep foods away from sore spots in your mouth.