Hematemesis: Vomiting blood is the forcing of the stomach contents up through the esophagus (the swallowing tube) and out of the mouth, in which the vomit contains blood.
 
http://www.nlm.nih.gov/medlineplus/ency/article/003118.htm 
Hematemesis
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Hematemesis

Canon 5DmkII Modeled by Asia Kreitz Photographed by Chase Jackson

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