Hemoptysis....: The most likely reason to cough blood, called hemoptysis, is bronchitis. But this symptom always requires an evaluation by a doctor because it could be due to malignancy. So, if you cough up blood, see your doctor asap. If you are short of breath or coughing up a lot of blood, go to the er. If you smoke, you need to quit to decrease airway inflammation.
Answered 12/9/2013
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