Calcified foci in the lower lobes of the lungs are foci or fibrous scar foci with calcium salt deposits that form locally in the lower lobes of the lungs due to lung infections, tumors, and inhalation of airborne dust particles. Most of the calcified foci in the lower lobes of the lungs are benign lesions and usually do not need to be treated, while a very small number of them are calcifications of lung cancer, which need to be surgically removed. 1.Benign lesions calcified foci (1) Lung infection: after bacterial or tuberculosis infection in the lung, calcium salts are deposited in the fibrous scar tissue to form calcified foci. (2) Tumor: the tissue cells of benign lung tumors such as misshapen tumors and inflammatory granulomas may release calcium salts to form calcified foci due to local ischemic necrosis. (3) Air environment: inhaled dust, asbestos, minerals and other particulate matter deposited in the lungs to form calcified foci. 2. Calcification of lung cancer: Cancer cells may release calcium salts after necrosis due to local ischemia and poor self-circulation to form calcified foci in cancer nests. Calcified foci in the lower lobe of lungs, it is recommended to go to hospital for further diagnosis and treatment.