WHY is a paper cut much more painful than a knife wound?

Lots of people experience much sharper pain when cut with paper than with a knife. The reason for this is that a paper cut is usually shallow and secretes little or no blood, leaving the nerve endings open to irritation from the air.

If the cut is deep, other factors come into play: first, the rough structure of the paper causes more microscopic damage to the skin than a straight knife edge, and second, the chemical substances with which the paper fibers are saturated cause additional irritation.

Also, note that most paper cuts occur on your fingertips, which have many more nerve receptors than other parts of your body.

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