The idea that damage has to be pain is mistaken. We....

“ The idea that damage has to be pain is mistaken. We feel pain because we have specific types of receptors called nociceptors which are programmed to respond to pain, not to touch. People can have genetic malfunctions where they feel pressure but never feel pain because they don't have pain receptors. ”

Daniel Chamovitz

From : What a Plant Knows: A Field Guide to the Senses