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Hematemesis is the scientific term for vomiting blood. But it’s not the same thing as hemoptysis, which is coughing up blood. The difference between these terms lies in the blood’s source. 

Hematemesis comes from somewhere along the digestive tract.  Hemoptysis originates in the lungs or the airway.  

So, what conditions other than cancer can cause this alarming symptom? And when should you see a doctor about...