Depend how much: If its a little bit in your phlegm then i would not worry about it. However if you are coughing up pure blood, then that is a sign of a serious disease. Many things can cause it, but most of them are bad. Tb, serious fungal infections, cancer, pulmonary embolism, arterial-venus malformation are a few. If you are coughing.
Answered 7/12/2013
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