While the presence of blood in the sputum is often due to disease of the lungs, it is by no means always so, and the recognition of the source of the bleeding is naturally of pre-eminent importance, not alone on account of its prognostic significance, but also from its bearing on the treatment to be employed. Occasionally the blood comes from soft and spongy gums resulting from various causes; at other times it is from the nares or the pharynx. Violent paroxysmal cough may cause laceration of tissue, with the escape of small amounts of blood. The sputum is mixed with blood, further, in cases of pneumonia and of hyperemia of the lungs from any other cause, inflammatory or hypostatic, as well as in the presence of pulmonary infarction and of diseases of the blood itself.
Blood from the lungs will appear in generous amount when pulmonary vessels of considerable
THE TREATMENT OF HEMOPTYSIS. JAMA. 1904;XLIII(1):33. doi:10.1001/jama.1904.02500010039005
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