Haemoptysis is the medical term for coughing up blood or bloody mucus from your lungs or airway. Massive haemoptysis is defined as 200-600 ml of blood coughed up within a period of 24 hours or less. The causes of haemoptysis include blunt trauma, infections, tumours and defects in your lung. Haemoptysis embolisation is a minimally invasive procedure which deliberately blocks the bleeding vessel, such as the bronchial arteries or pulmonary veins