Your skin has evolved with the expectation that you will get minor cuts a lot. So your skin has tiny little blood vessels that are easy for the right blood components to seal up, and easy to heal. The blood goes outside, which means it kinda goes away (and you need to drink more to replace it, sure, but that’s easy).
Internal bleeding means not only is blood going where it shouldn’t inside your body, but it’s coming out of damaged blood vessels that are hard for the body to repair by itself.
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