VS.

Melena vs. Hematochezia

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Wikipedia
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  • Melena (noun)

    The passage of dark, tarry stools containing blood, a result of upper gastrointestinal bleeding.

  • Hematochezia (noun)

    The presence of fresh blood in stools, often due to lower gastrointestinal bleeding.

Wiktionary
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Webster Dictionary
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  • Melena (noun)

    abnormally dark tarry feces containing blood (usually from gastrointestinal bleeding)

  • Hematochezia (noun)

    passage of stools containing blood (as from diverticulosis or colon cancer or peptic ulcer)

Princeton's WordNet

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