Is spicy food bad for you? Obviously, Because whenever I eat spicy food, my mouth seems to be on fire. This is because spicy food generally contains chilli peppers. Chilli peppers have a chemical called capsaicin. When capsaicin comes in contact with our tongue. It activates the heat-sensing receptors instead of our taste buds. As a result, our brain thinks that our mouth is on fire. So, shall I call the Fire brigade? Just listen. Capsaicin present in spicy food is not necessarily bad for everybody. Only those people who have a low tolerance level. Or don’t have a habit of eating spicy food. Can experience some problems like. Burning mouth, mouth burn, heartburn, irritation of the stomach lining, etc.