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hematemesis (he″mә-temīә-sis)   the vomiting of blood. A fresh hemorrhage will yield bright red blood, but blood that has been in the stomach for a time will be acted on by stomach acids and be thick and dark colored. Common causes of hematemesis include peptic ulcer, gastritis, esophageal varices or lesions, and cancer of the stomach. Benign tumors, traumatic postoperative bleeding, and swallowed blood from points in the nose, mouth, and throat can also produce hematemesis.




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