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Does coughing up blood (hemoptysis) always come from bleeding in the lungs and airways?

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Hemoptysis can also come from bleeding outside the lungs and airways. Severe nosebleeds or vomiting of blood from the stomach can result in blood draining into the windpipe (trachea). The blood is then coughed up, appearing as hemoptysis.

From: Coughing Up Blood (Hemoptysis) WebMD Medical Reference

SOURCES:

Mason, R. , 5th edition, Saunders, 2010. Cahill, B.C. 1994; vol 15: pp 147-167. Murray and Nadel’s Textbook of Respiratory MedicineClinics in Chest Medicine,

Hirshberg, B. , 1997; vol 112: pp 440-444. Chest

Adelman, M. 1985; vol 102: pp 829-834. Annals of Internal Medicine,

Chang, J.C. 1987; vol 4: pp 49-54. Sarcoidosis,

Reviewed by Nayana Ambardekar on November 18, 2017

SOURCES:

Mason, R. , 5th edition, Saunders, 2010. Cahill, B.C. 1994; vol 15: pp 147-167. Murray and Nadel’s Textbook of Respiratory MedicineClinics in Chest Medicine,

Hirshberg, B. , 1997; vol 112: pp 440-444. Chest

Adelman, M. 1985; vol 102: pp 829-834. Annals of Internal Medicine,

Chang, J.C. 1987; vol 4: pp 49-54. Sarcoidosis,

Reviewed by Nayana Ambardekar on November 18, 2017

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Is the cause of coughing up blood (hemoptysis) always known?

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