Bronchiectasis may be a bacterial or viral infection. Bronchiectasis is caused by chronic inflammation of the airways and their surrounding lung tissues, resulting in damage to the airway walls and subsequent expansion and deformation of the lumen. Clinical manifestations are mainly chronic cough, sputum, intermittent hemoptysis and recurrent lung infections. The common bacterial infections of bronchiectasis are Pseudomonas aeruginosa, etc., while viral infections can be infected by other viruses besides adenovirus, such as influenza virus and respiratory syncytial virus. There are other causes of bronchiectasis, so the treatment needs to identify the cause of bronchiectasis and then take different treatment according to different causes. It is recommended to go to the hospital in time to find out the cause of the disease and then give targeted treatment.