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All your flesh has capillaries and veins that carry fluid. Everytime that you damage your tissue (smash it with a hammer) you break open some of the fluid carrying "highways." The fluid "floods the countryside" and your poor thumb starts to swell up.

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16y ago

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Because You Are Hitting The a Object of Your Body. Such as if you were hitting other places. legs,arms ECT

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14y ago
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Q: Why do my fingers hurt when i hit them with a hammer?
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