I think it has to do with the tissue around the corn rather then the corn itself. Your skin is soft and able to stretch. When part of the skin hardens, it is no longer able to stretch as well as the rest, so there is pain as the rest if the skin stretches to its limits. Take that over a long period of time, and all of the skin surrounding the corn would hurt, causing you to feel like the corn itself is hurting.
It could also be that corns and calluses are caused by excess friction and pressure. You could just be feeling the pain of the inciting problem, probably magnified as the hardened skin pushes into softer tissues
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