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It is by no means always easy to determine at once the source of hemorrhage when blood is ejected from the mouth. It is true that certain peculiarities of appearance serve to distinguish the blood as it comes either from the respiratory or the digestive passages. Thus blood from the lungs is likely to be frothy and florid in hue, while that from the stomach is usually dark and clotted from the action of the gastric juice. In the one instance the hemorrhage attends or follows cough; in the other it is associated with vomiting or regurgitation. It must, however, be borne in mind that blood from the lungs may enter the stomach and be rejected by vomiting, while blood from the stomach may be inspired into the larynx and trachea and be expelled by cough.
Even when in a given case it is recognized that the bleeding has its
THE DIAGNOSTIC SIGNIFICANCE OF HEMOPTYSIS. JAMA. 1897;XXIX(1):40. doi:10.1001/jama.1897.02440270046008
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