Swollen legs and feet in the elderly may be caused by standing for too long, diabetic nephropathy or heart failure and other diseases. 1. Standing for too long: as the elderly grow older, the venous valves in the deep veins of the lower limbs will decrease in function. If the elderly stand for too long, there will be obstacles to venous return, which will lead to the symptoms of swollen legs and feet. 2. Diabetic nephropathy: If the elderly suffer from diabetes, and long-term poor control of blood glucose levels, it will lead to diabetic nephropathy, increased urinary protein excretion, renal insufficiency, which in turn causes swelling of the legs and feet. 3. Heart failure: heart failure is a serious impairment of heart function, can not maintain normal blood circulation, blood and water stagnation in the tissues and organs, there will be symptoms of swollen legs and feet, may also be accompanied by coughing, dyspnea and other symptoms. There are many other causes of swelling in the legs and feet of the elderly, if rest and massage can not be improved, it is recommended to consult a doctor in a timely manner, so as to avoid delaying the condition.