Hemoptysis: Spitting or coughing up blood or bloody-stained sputum. Pronounced he-MOP-ti-sis.
The word "hemoptysis" comes from the Greek "haima" for "blood" + "ptysis" meaning "a spitting" = a spitting of blood. The source of the blood is from the respiratory tract such as the airways (bronchi), trachea, or lung. Hemoptysis can be a sign of serious conditions including pneumonia, tumors, or bronchitis as well as other conditions.
A contrasting term is hematemesis, which means vomiting up blood. With hematemesis, the source of blood is the gastrointestinal system, rather than the respiratory system.