Monitor closely!: Blood in sputum is usually due to a respiratory infection, with blood coming from superficial blood vessels traumatized by coughing, and should resolve as one recovers. However, other causes exist and the amount of blood expelled, and for how long, needs to be monitored closely. If it frank blood, instead of blood tinged sputum, or ever more than a tablespoon, please call your doctor immediately.
Answered 5/28/2016
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