The presence of calcification in the lymph nodes of the lungs suggests that the patient has had a long history of chronic infectious lung disease, especially predominantly pulmonary tuberculosis. Infection with tuberculosis is associated with plaques, exudates, proliferations, nodules, and calcifications in the lungs, with mediastinal lymph node calcifications being particularly common. Once lymph node calcification occurs, it indicates that the patient has had chronic infection for a long time. If aggressive anti-tuberculosis treatment is given, calcification of lymph nodes in the lungs will not disappear, and therefore has no special clinical significance. Calcification of lymph nodes in the lungs is also common in people who smoke for a long time and in those who work with dust, including masons and coal miners. Long-term inhalation of dust containing silica tends to form more lymph node calcifications in the lungs, especially in the mediastinum. Once formed, calcifications have no special clinical significance and do not require special treatment. Other chronic infectious diseases of the lung, including lung abscess, severe pneumonia, chronic pulmonary fibrosis, and chronic obstructive pulmonary disease, also tend to form lymph node calcifications and do not require special management. Calcification does not form in patients with tumors, so the formation of lung cancer is not considered when calcification of lymph nodes occurs.