Why do we feel pain?

Pain is warning signal telling us that there is some danger threatening our health. We feel pain through specific receptors, the sensors, in the skin. These can also be found in the organs and the periosteum. Our body has two pain systems, a fast one and a slow one. If our hand touches a hot object, we withdraw it instinctively without even thinking. This is the fast pain system in action. However, the pain the comes later due to the burning skin or a blister, is transmitted by the slow pain system to the brain.