In the official pathology report after lung cancer surgery, patients will see that in addition to the size and pathological type of lung tumor, there will also be descriptions of lymph nodes, the most intuitive of which is the lymph node number. Many friends will ask, what do these lymph node numbers mean? Is the larger the number the better or the smaller the number the better? Today we are going to talk about this issue. Lymph nodes are abundant in the lungs, and there are lymph node networks and lymph nodes in the lungs and on the surface and in the mediastinal position of the chest. The lymph nodes of lung are divided into fourteen groups according to their locations. In lung cancer surgery, lymph node dissection or sampling resection is performed according to the specifications. The cut lymph nodes will be tested by pathologists for metastasis of lung cancer cells, and if there is metastasis, the N stage in the final staging TNM will be determined according to which groups of metastasis exist. If the lymph nodes metastasize to group 10 to 14 lymph nodes, it is N1(+), if the lymph nodes do not metastasize, it is N0. If the lymph nodes metastasize to the lymph nodes in the neck or the contralateral lymph nodes, it is N3(+).