The act of vomiting blood, which indicates serious internal bleeding usually from the stomach or esophagus.
From Greek haema (blood) + emesis (vomiting), literally 'blood vomiting'. The term emerged in medical literature as internal bleeding conditions were classified in the 18th century.
Haematemesis is one of those medical emergencies that immediately tells doctors something major is wrong—your stomach lining or esophagus is bleeding heavily! It's actually named with brutal honesty: just literally 'blood vomiting' in Greek.
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