Increased bilateral lung permeability is only an imaging description, and its severity needs to be determined by the specific type of disease and condition. Increased lung permeability is an imaging concept that refers to a localized or diffuse increase in the air content of the lungs, which is commonly seen in cavitary lesions of the lungs, emphysema, and pulmonary hyperventilation. Conditions such as chronic bronchitis, emphysema, alveoli, and pneumothorax can present with increased transmittance in both lungs. The extent and degree of increased transparency in both lungs can help determine the condition to a certain extent, but the exact severity of the condition needs to be determined in conjunction with the specific disease, signs and symptoms, and other laboratory tests. If the patient has increased transparency in both lungs, combined with obvious dyspnea, respiratory failure, heart failure, etc., the condition is usually more serious. It is recommended that the patient go to the hospital in time, complete the relevant laboratory tests to clarify the cause of the disease, evaluate the condition and follow the doctor’s instructions to actively treat the disease.