So where does such a chili pepper get its big heat? The answer is capsaicin, a chemical in the pepper.
When you eat a pepper, capsaicin comes in contact with your mouth’s pain receptors. These pain receptors sense heat. When capsaicin activates the pain receptors, they send a message to your brain indicating you have eaten something hot.
Your brain responds by raising the heart rate, increasing perspiration and releasing endorphins, which are considered special body chemicals that help relieve pain.
Peppers come in various sizes, shapes, colors, and spiciness levels.