Lymph on the lungs refers to the clinical appearance of lymph node hyperplasia and enlargement in the lungs, which can be caused by many reasons, the most common is inflammatory reaction. For example, tuberculosis caused by Mycobacterium tuberculosis infection, Mycobacterium tuberculosis will cause invasion of the mucous membrane of the lungs, so that a marked inflammatory reaction occurs, which can be congestion, edema, exudate, hyperplasia, Mycobacterium tuberculosis makes lymph nodes enlarged, edema, hyperplasia. It is also seen in occupying lesions in the lungs, such as malignant tumors, bronchopulmonary carcinoma, and alveolar cell carcinoma, where the lymph nodes surrounding the carcinoma are also invaded by the cancer cells, causing them to proliferate and enlarge. It is also seen in malignant tumors outside the lungs, such as metastatic tumors in the lungs caused by bone cancer, which will also show hyperplasia and enlargement of long lymph nodes on the lungs.