In fact, calcified dots in the lungs are actually a reflection of calcification of lung tissue. Usually, the following factors may lead to calcification of lung tissue: i. It may be a tissue change formed during the growth of the tumor due to inflammatory reaction, or it may be a trace left after infection. Calcified spots in the lungs are usually the scar left after healing from previous viral, bacterial, tuberculosis or mycoplasma infections; ii. Long-term exposure to asbestos, dust, granite, etc. may cause diverse calcifications in the lungs. In conclusion, further relevant examinations should be performed according to the different clinical manifestations of the patient in order to clarify the specific cause. Calcified spots in the lungs are like moles on the skin, mostly deposits of necrotic cells are benign, most patients will not have obvious symptoms and usually do not need special treatment, if patients have adverse symptoms they should go to the hospital for examination in time.