Popsugar Living Cooking Basics Fun Food Facts 16 Burning Questions You've Always Wondered About Common Ingredients September 2, 2017 by Erin Cullum First Published: August 31, 2017 View On One Page Photo 13 of 16 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 13 Why does pineapple irritate your mouth? Pineapple causes mouth irritation for many people, but why? Pineapples contain a plant protease enzyme called bromelain, which may cause a prickly sensation when consumed. Previous Next Start Slideshow Cooking BasicsFood News