The causes of pulmonary calcified nodules are usually due to old lesions, such as calcification of infected foci, and may also be due to tuberculosis as well as lung cancer. Calcified nodules are high-density shadows that appear on CT images. They are nodular lesions in the lung tissue that, for some reason, have become necrotic and calcium salts have been deposited in the nodules to form calcifications. In general, nodular calcification is benign in most patients and malignant nodules are seen in a small percentage of patients. Clinically, calcified nodules in the lungs are generally due to old lesions, which usually do not cause obvious symptoms and consequences, such as tuberculosis after treatment and recovery of the lesion is not completely absorbed, will form calcified foci in the lungs, lung inflammation may also be left behind after healing of calcified nodules in the lungs. In general, this situation does not require special treatment. Calcified nodules in the lungs may also be the result of new-onset tuberculosis or lung cancer. If it is new-onset tuberculosis, it should be actively treated with anti-tuberculosis drugs in early stage, appropriate amount, combination, regularity and the whole course of treatment; if it is lung cancer, it should be treated with surgical resection and radiotherapy according to the situation. It is recommended to consult a doctor in time and treat under the guidance of a professional doctor to avoid delaying the condition of lung calcification nodules.