In lung cancer with swollen feet, firstly, hypoproteinemia and poor renal function need to be considered. Secondly, tumor compression and metastatic tumor compression need to be considered, as well as the condition caused by vascular and lymphatic reflux obstruction. If it is caused by hypoproteinemia, it is necessary to supplement albumin. If it is caused by poor renal function, it is necessary to actively correct renal function, and at the same time, it is necessary to do CT and ultrasound examination. If it is proved to be caused by tumor compression, radiotherapy, chemotherapy and targeted drug therapy are needed to make the lesion shrink and improve the situation of vascular and lymphatic reflux obstruction.