Thickening of the texture of both lungs is a commonly used radiologic term that is not specific to a particular disease and can be caused by both pathologic as well as physiologic reasons. The diagnosis should be based on clinical symptoms. 1. Pathologic causes: If the patient does not have any symptoms and is only found to have thickened lung texture, it can be observed for the time being. If there are corresponding symptoms, such as fever, cough and other respiratory symptoms, and at the same time the thickening of lung texture, it may be acute or chronic bronchitis, pneumonia, etc.. Prolonged coughing and sputum are often seen in chronic obstructive pulmonary disease (COPD) and asthma. 2. Physiological causes: long-term smoking may also cause thickening of lung texture, which may also occur in the elderly. If there is no organic lesion in other parts of the body, it is considered that the observation can be continued.