From the overall clinical data show statistics, the lungs appear to have fibrotic foci do not account for the majority of people, just with the current physical examination found that the relative appearance of more and more. Mainly common in the elderly, as well as long-term smoking population, the main manifestation of the lungs have varying degrees of fibrosis, calcification of lung tissue performance. The main inflammatory reaction, the more common clinical pathogen inflammation, such as bacteria, tuberculosis, mycobacterial infection caused by lung inflammation. There are also unexplained foci of idiopathic interstitial diffuse fibrosis of the lungs, the cause of which is not clear enough and may be related to the individual’s living environment, such as a large amount of air pollution and inhalation of dust, including silica, pneumoconiosis, as well as inhalation of heavy metals and exposure to radioactive chemicals.