Patients often ask their doctors with their x-ray reports: “What is the thickening of the texture in both lungs”? In fact, to answer this question, we must understand the anatomy of the lungs. The two lungs of the human body are somewhat like sponges, loose and elastic. In addition to the alveolar tissues for gas exchange, there are trachea, bronchi, arteries and veins, and lymphatic vessels. These tissues, which are denser than the alveoli, branch out from the middle of the two lungs, like branches bifurcating toward the edges, becoming thinner as they get closer to the edges. X-rays are invisible to the naked eye and can penetrate the human body, making photographic film sensitive to light. X-rays of the chest, trachea, blood vessels and lymphatic vessels show dendritic shadows on a fluorescent screen or photograph. The dendrites extend outward from the hilum and become more and more subdivided, ending at the edges of both lungs. The radiology department has a term for this, called “lung texture”. When the airways that make up the “lung texture” become inflamed and the blood vessels become thickened and congested, the lung texture will be “enhanced” or “thickened”. Common causes of “thickened lung texture” include: acute and chronic bronchitis, bronchiectasis, congenital multiple pulmonary cysts, cardiac atrial septal defect, ventricular septal defect, arteriovenous ductus arteriosus, mitral stenosis, rheumatic heart disease, heart failure due to various causes, lymphocytic leukemia, interstitial pneumonia, collagen The lung texture is not only a function of the morphology and distribution, but also a function of the lung texture. However, there are obvious individual differences in the shape and distribution of lung textures, with some thicker and some finer; some are blurred and some are clearer on fluoroscopy and radiographs, depending on the conditions; and the physician’s judgment criteria are not exactly the same. Therefore, the radiology department’s report of “thickened lung texture” should be analyzed in the context of the specific situation to make a correct diagnosis.