There are many diseases that can lead to lung shadows: 1. old lesions, calcified foci left by previous tuberculosis or pneumonia, which do not require special treatment and only need to be reviewed regularly. 2. pneumonia, especially in the elderly, can have no clinical symptoms, and if the patient is diagnosed with pneumonia, further relevant tests are needed to assess the possible causative organisms and to make targeted treatment according to the causative organisms. 3. Patients diagnosed with tuberculosis should undergo active and systematic anti-tuberculosis treatment, including isoniazid, rifampin, pyrazinamide, streptomycin, etc. 4. Lung tumors can also appear as shadows in the lungs. If the patient is diagnosed with lung tumor, he can take surgery, radiotherapy, chemotherapy or targeted cell therapy.