Normally, the deep veins of the lower extremities have well-functioning valves that allow only the blood in the veins to flow toward the heart, and when the venous blood refluxes the valves close and block the blood flow. The so-called venous valve insufficiency is the inability of the valve to close completely, resulting in venous blood reflux. Because most human activities remain upright, venous valve insufficiency inevitably results in a continuous increase in venous pressure in the lower extremities, and intravascular fluid leaks out into the tissues, producing lower extremity edema. The most typical characteristic is light in the morning and heavy in the evening, that is, the edema is reduced in the early morning and increased in the evening. The risk of lower extremity deep vein valve insufficiency: 1, poor venous blood return, venous blood stagnation produces deep vein thrombosis. 2.Venous blood stagnation causes lower limb tissue malnutrition and produces lower limb ulcers. 3.Venous hypertension leads to superficial varicose veins. How to do when lower limb edema is found? 4.First of all, avoid sitting and standing for a long time, then go to the vascular surgery department immediately. 5.Surgical treatment is feasible, which is to restore the function of the superficial femoral vein valve by reducing the diameter of the vein, so as to stop the venous blood reflux. 6.Wearing elastic stockings is a simple and effective treatment method. 7.Elevate the lower limbs when lying down.