There are so many people who enjoy eating hot sauces and spicy foods, while others do not find pleasure in the pain of peppers. The burning sensation is due to the capsaicin. Capsaicin is an active component of chili peppers. There are several sensory receptors on the tongue, which detect heat. These receptors are called TRPV1.
When capsaicin binds to these receptors, they activate a chemical response. They send a warning signal to your brain that the temperature of your mouth is too high. However, there is no actual heat. It’s just a chemical trick to your brain! This is how chili pepper actually puts your mouth on fire!