Bronchiectasis is a common infectious disease of the lower respiratory tract, mostly caused by viruses and bacteria, with cough and sputum as the main clinical manifestations. Chest X-ray can indicate increased texture and thickening of both lungs without inflammatory changes. Bronchiectasis does not require a CT examination of the chest because CT of the chest is mainly used to identify difficult manifestations suggested by the chest X-ray, including nodular shadows and shadows whether combined with tuberculosis and tumor changes, before giving a CT examination. CT examinations for bronchiectasis can also reveal increased and thickened texture in both lungs, especially in people who have been smoking or working with dust for a long time, which can be easily distinguished from silicosis. If early lung cancer occurs, abnormal occupying changes can be seen in the lungs. Bronchiectasis is not clinically indicated by a CT examination of the chest, but a CT examination of the chest can further investigate whether the cough and sputum are caused by bronchiectasis alone or by other lung pathologies, mainly as a differential diagnosis.