Calcified spots in the lungs may be due to environmental factors, tuberculosis, and pneumonia. Caused by. 1. Environmental factors: patients’ long-term exposure to granite, asbestos, dust and other substances due to work or life may cause calcification of the lungs, leading to pneumoconiosis. 2. Tuberculosis: Tuberculosis is caused by infection of the lungs with Mycobacterium tuberculosis, which is a chronic disease that can cause damage to the lungs, and patients will experience symptoms such as low-grade fever and cough. After tuberculosis is under control, the damaged alveoli will gradually calcify, resulting in the appearance of calcified spots in the lungs. 3. Pneumonia: Pneumonia can also cause damage to the alveoli, resulting in fever, cough, chest tightness, dyspnea and other symptoms, and will leave calcified spots after recovery from pneumonia treatment. Patients should go to the hospital for examination and treatment in time when their lungs are in discomfort.