Lymph nodes in the lungs may be caused by inflammatory infections, tuberculosis, tumors and lesions of the lymphatic system itself. 1. Inflammatory infections: when suffering from chronic inflammatory infections such as bronchitis or pneumonia, if no intervention is given to the treatment, the surrounding lymph nodes will be infected for a long time, which may induce the appearance of lymph nodes in the lungs. 2. Tuberculosis: If the patient suffers from tuberculosis and the condition worsens at the same time, it may also lead to the enlargement of the lymph nodes in the lungs, which may cause the condition of lymph nodes in the lungs. 3. Tumor: malignant tumors in the lungs can trigger the enlargement of lymph nodes, which will subsequently cause the enlargement of lymph nodes in the lungs, and with the development of the disease, certain tumors will also have local metastasis. 4. Lymphatic system lesions: If the patient suffers from lymphoma or other lymphatic system lesions, it may cause enlarged lymph nodes in the lungs. It is suggested that patients with lung lymph nodes should go to hospital to clarify the cause of the disease and then take treatment under the guidance of doctors.