How can the pain intensity from a tiny injury (eg peeling a bit of skin under your finger nail) be every bit as strong as a much bigger injury?
In: Biology
See the “sensory homunculus” for the relative density of nerve endings on you body. You will see that the hands and lips are prime places to feel disproportionate amounts of pain.
Another factor of small injuries are due to the nature of papercuts. They cut shallow and bleed very little. This leaves nerve endings exposed to the air, which makes them more likely to send pain signals back to the brain. Similar miniscule injuries are vulnerable to the same effect.
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