Lymph node swelling after micro-invasive lung adenocarcinoma surgery may be caused by tumor lymph node metastasis, lymphadenitis, lymphoma and other reasons. 1. Tumor lymph node metastasis: recurrence and metastasis may also occur after microinvasive lung adenocarcinoma surgery. When the tumor recurs and metastasizes to lymph nodes, it forms metastatic foci in lymph nodes, which causes swollen lymph nodes. 2. Lymphadenitis: after microinvasive lung adenocarcinoma surgery, patients may have low resistance, and when lymph nodes are infected by bacteria, virus, fungus, etc., it will cause local inflammatory reaction, and the inflammatory stimulation will lead to redness, swelling, heat and pain of lymph nodes, which will show enlarged lymph nodes. 3. Lymphoma: After microinvasive lung adenocarcinoma surgery, due to reduced resistance, it can be complicated with other tumor diseases, such as lymphoma, and patients with lymphoma can have multiple enlarged lymph nodes. Therefore, patients with enlarged lymph nodes after micro-invasive lung adenocarcinoma surgery need to go to the hospital in time to improve the examination and clarify the cause of the disease, and then give targeted treatment according to the cause of the disease.