There are a few things, some involving the paper, some involving your skin.
For one thing, what a part of your body comes in touch with paper the most? Right, the bulk of paper cuts happen on the fingers and hands. Your hands are pretty complex sensory instruments, and they’re absolutely full of nerve fibers called nociceptors. These guys sense temperature, pressure, and pain, and there are more of them per sq inch in your hands and fingers than most other parts of your body. Injuries there are noticed far more than similar injuries elsewhere. an equivalent small paper cut on a less nerve-dense area, such as, say, your leg, won’t send nearly as many pain signals to your brain.
To make matters worse, it’s not such as you can just not use your hands for a couple of days after every paper cut. You’ve got stuff to the touch and things to select up, so while the cut heals, the skin keeps moving and therefore the edges of the wound tend to urge pulled apart, delaying healing and prolonging the pain.
All right, sure, your hands are very sensitive, on the other hand, why do paper cuts hurt quite some cuts made by other objects, like knives? Well, the blade of even a reasonably dull knife tends to be more straight and sharp than the dull and versatile fringe of a bit of paper. When a knife cuts your skin, it leaves a comparatively clean-cut compared to paper, which can flex a touch and do more microscopic damage to the skin. Paper also makes a more shallow wound than most other cutting injuries. A shallow cut on the surface might only bleed a touch , or not in the least. Without a grume to guard them, the nerves around the cut are exposed to air and other irritants, which may make the pain more noticeable and longer-lasting.
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