In clinical work, we encounter some patients with “bronchiectasis” who go to the hospital thinking that they have “bronchitis”. Bronchiectasis is a common chronic bronchial septic disease, mostly secondary to respiratory infections and bronchial obstruction, especially bronchopneumonia in children and young people after measles and whooping cough, due to the breakage of the bronchial tube wall, the formation of lumen expansion and deformation. The main contributing factors are infection of the broncho-pulmonary tissue and bronchial obstruction. Infection causes congestion and edema of the mucosa of the lumen, making the lumen narrow and secretions easily block the lumen, leading to poor drainage and aggravating the infection; poor drainage of bronchial obstruction can induce lung infection. Therefore, the two affect each other and contribute to the occurrence and development of bronchiectasis. Most patients have a history of measles, whooping cough or bronchopneumonia that persists in childhood, and later often have recurrent infections of the respiratory tract. The typical symptoms are chronic cough with large amounts of pus sputum and recurrent hemoptysis. Therefore, when you have the above three manifestations, do not keep thinking that you still have the previous “bronchitis”, but most likely “bronchiectasis”, and the treatment of the two is different, you should go to the hospital as soon as possible.