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... gaze slightly sharpened, and his expression became serious.
Bloody stool often indicates gastrointestinal bleeding.
If it is upper gastrointestinal bleeding, the discharged stool is often black. Because the fresh blood produced gets absorbed in the lower gastrointestinal tract, by the time it is expelled, it has turned black and mixed with the stool.
At this point, a routine stool examination often shows positive occult blood.
In fact, you can tell just by lookin ...
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