Coughing up blood may indeed be the presenting symptom for lung cancer. It is not specific however for it. There are a number of infections in the lung that may produce this, as well as problems with obstructed blood vessels which may rupture. Perennial coughing may also irritate the throat and the larger airways, that the bleeding may only be from the coughing itself (though this usually presents as minimal blood). Also, while the blood comes with the cough – it would be prudent to evaluate if it is indeed coming from the lung and not the stomach. A visit to a doctor would be a good start.
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