expectoration of blood as a result of respiratory tract bleeding. It is not to be confused with blood-streaked sputum, a common complaint, but is usually benign and seen with an upper respiratory tract infection.
Literally, blood in the respiratory tract secretions (coughing up blood). Hemoptysis is usually caused by very high pressures in the venous (right sided) circulation (such as in Eisenmenger's), resulting in the breakage of smaller blood vessels supplying the lungs. It can vary from trace to life-threatening amounts. Click here for additional information