It can, slowly.
If the bleeding is slow enough, it can be reabsorbed without anybody noticing anything.
If the bleed is fast enough though, the body cannot reabsorb it fast enough.
As it so happens, if you can notice that there is internal bleeding, the bleeding was faster than the absorption rate.
This means that all the examples of “internal bleeding” we know about are those where the bleeding was too fast.
On the flip side, imagine how many times each of us have “internal bleeding” that was so small in volume or so slow in rate that it was all absorbed without anybody noticing.
In very small quantities and broken down into sub cellular constituents it is reabsorbed. For instance a tooth extraction socket may bleed slightly for a considerable time without serious loss to the bleeder and all or most may be swallowed whereupon it will be handled by the stomach and gut like everything else that goes down. Internally it can and is reabsorbed in broken down forms. When you sustain a bruising injury, the pigments seen are products of haemoglobin and gradually fade as the molecules are reabsorbed. Even haemotomata (largish sub dermal bleeds) will disappear so long as they don’t become infected. Larger amounts of blood, say in the abdominal cavity cannot be reabsorbed quickly enough to save the patient from risk due to infection.
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