Millions of people deal with allergies brought on by different kinds of pollen. But did you know that eating certain fruits, vegetables, nuts and spices can also trigger a reaction? It's called cross-reactivity, and it happens because the proteins in some foods are similar to those allergy-causing proteins in some pollen, according to the Mayo Clinic. Typically, it might cause the mouth to tingle or itch; in some people, pollen-food allergy syndrome, or oral allergy syndrome, can cause throat swelling or anaphylaxis. Cooking fruits and vegetables can help avoid a reaction. Read on for foods to be wary of if you're pollen-sensitive.