Causes of Hemoptysis : Coughing out Blood

• Infections. These include pneumonia; tuberculosis; aspergillosis; and parasitic diseases, including ascariasis, amebiasis, and paragonimiasis.
• Tumors that erode blood vessel walls.
• Drug abuse. Cocaine can cause massive hemoptysis.
• Trauma. Chest injuries can cause bleeding into the lungs.
• Vascular disorders, including aneurysms, pulmonary embolism, and malformations of the blood vessels.
• Bronchitis. Its most common cause is long-term smoking.
• Foreign object(s) in the airway.
• Blood clotting disorders.
• Bleeding following such surgical procedures as bronchial biopsies and heart catheterization.