Increased translucency in both lungs is serious and commonly seen in chronic obstructive pulmonary disease, bronchiectasis, and bronchial asthma. 1. Chronic Obstructive Pulmonary Disease (COPD): The combination of small airway disease and destruction of lung parenchyma causes persistent airflow limitation, structural remodeling of the airway wall, resulting in narrowing of the airways, causing fixed airway obstruction, which may result in expiratory dyspnea, increased air content in the lung tissue, and increased translucency in both lungs as seen in the imaging findings. 2. Bronchiectasis: Infectious diseases of the lungs such as bronchiectasis cause diffuse obstruction of the small bronchial tubes in the lungs, resulting in gas retention in the lungs, which may be manifested as an increase in the translucency of both lungs on imaging. 3. Bronchial asthma: During an attack of bronchial asthma, expiratory dyspnea occurs, and it is difficult for gas to be exhaled from the lungs, which may result in an increase in the amount of air contained in the lungs, and an increase in the translucency of the lungs can be seen on imaging. If the imaging test suggests that the translucency of both lungs is increased, it is recommended to consult a doctor in time to make a clear diagnosis and follow the doctor’s instructions to provide targeted treatment.