Lung calcification refers to the high density shadow visible on imaging examination, which is mostly caused by lung diseases, such as pneumonia, tuberculosis, other diseases and so on. 1. Pneumonia: after anti-infection treatment, inflammation is locally absorbed, fibrous tissue forms scar, and finally lung calcification is formed. 2. Tuberculosis: the invasion of tuberculosis bacillus will lead to caseous necrosis in human lungs, the necrotic material cannot be absorbed, and the calcium carbonate and calcium phosphate of human body will be deposited near the tuberculosis foci, forming lung calcification. 3. Other diseases: Calcium deposition formed after malnutrition and bleeding, tumor metabolism abnormality or tumor cells themselves have certain endocrine function, etc. can form pulmonary calcification. Lung calcification can also be seen in other diseases, patients should go to the hospital in time, so as to avoid delaying the condition.