1.Poor vascular function in the elderly can cause swelling in both legs, which is obvious in the afternoon and evening and light in the morning. 2, antihypertensive drug CCB can cause swelling of legs, because CCB dilates mainly the small arteries in front of capillaries, which can be reduced after combining with ACEI or lying down. 3, leg swelling in heart failure, due to poor cardiac function to venous return obstruction, the application of diuretics is effective. 4, liver disease, malnutrition, hypothyroidism can be double lower limb edema. 5, one leg swelling to think of peripheral vascular disease.