Swelling of the lower legs in the elderly, first of all, should be carried out color ultrasound examination of the lower extremity veins, preferably three-dimensional ultrasound examination, except for the lower extremity deep vein thrombosis, because the elderly people have little activity, often bedridden, easy to lead to blood stagnation, is the cause of thrombosis. After ultrasound examination confirms the diagnosis, in the absence of contraindications, anticoagulation treatment should be chosen, applying low molecular heparin calcium subcutaneous injection, administered twice a day, and at the same time, the lower limbs need to be elevated, to promote venous blood reflux, and to avoid activities, so as not to dislodge the embolus, inducing the occurrence of pulmonary embolism. Further cardiac ultrasound and ultrasound examination of the urinary system is needed, because some patients with cardiac insufficiency and right heart failure may also lead to stagnation of the circulation and swelling of the distal limbs, and the patient may also have the symptom of oliguria, and should be given cardiotonic and diuretic medications for treatment.