Re: Why does cinnamon candy burn your mouth?

Cinnamon candy contains either a natural extract of cinnamon or an artificial flavor designed to taste like cinnamon. Both the natural extract and the artificial flavor contain the chemical called cinnamaldehyde (or cinnamic aldehyde) as a major component. Cinnamaldehyde interacts with sensors, called trigeminal nociceptors, in your mouth. These sensors are designed to detect heat or other irritants. These sensors stimulate the trigeminal nerves to send a signal to your brain. This signal is interpreted by the brain as irritation, pain or heat.

So basically the cinnamon is tricking your brain into thinking that there something irritating in your mouth. If the sensation is mild, we perceive this as a pleasant spiciness. But if the sensation is too strong, it becomes uncomfortable.