The edema of lung cancer patients depends on the location and cause of edema: if it is bilateral lower limb swelling, hypoproteinemia and malnutrition can be solved by protein supplementation plus diuretic. And if it is combined with unilateral pleural effusion, the pleural effusion can be fully drained and chemotherapy drugs or anti-tumor angiogenic drugs can be instilled inside the chest cavity to reduce the pleural effusion. In case of bilateral upper limb swelling, consider superior vena cava compression or superior vena cava compression syndrome, radiotherapy or simultaneous radiotherapy can be administered to mediastinal tumors, which may reduce the compression of mediastinal tumors on superior vena cava and thus help to relieve the symptoms of edema. If it is metastasis to the pelvic cavity that causes occupying pelvic lesions that lead to bilateral lower limb obstruction, local stereotactic radiotherapy for the occupying pelvic cavity can also help to relieve edema symptoms.