The causes of leg swelling in the elderly are as follows: 1, the most common cause is because of the return obstruction caused by venous valve insufficiency in the lower extremities of the elderly; 2, the formation of venous thrombosis in the lower extremities of the elderly; 3, the higher incidence of heart failure in the elderly, heart failure can also cause edema in the lower extremities; 4, other: renal insufficiency, hypoproteinemia, malnutrition, hypothyroidism; 5, there is also a part of the use of calcium ion channel blockers can also cause edema of the lower limbs, which is the most common cause. Some patients with lower limb venous reflux disorders in the elderly are characterized clinically by reduced swelling in the morning when they wake up, and more severe swelling in the evening. For this kind of patients, we often warn them not to stand too long, to do some functional exercises, some patients may need to lower limb straps and so on.