haemoptysise occurs in 50-70% of patients The volume of haemoptysis varies from streaks of blood to massive blood, The Severity of disease often depends on the volume of 咯血. Massive 咯血could caus death because of asphyxia or hemorrhagic shock. A special type: Dry bronchiectasis ,Only present as recurrent hemoptysis; Is secondary to M.tb infection or bronchial artery malformation.