Medical elastic stockings have the function of promoting venous blood flow back to the heart, and are designed according to the different physiological pressure gradients from bottom to top of the lower limbs, establishing the highest support pressure at the ankle, and gradually decreasing the pressure up the leg to 70%-90% of the maximum pressure value at the gastrocnemius (calf belly) and 25%-45% of the maximum pressure value at the thigh. This decreasing change of pressure can promote the venous blood flow back to the lower extremities, effectively relieving or improving the pressure on the veins and venous valves of the lower extremities, so that the clinical symptoms of venous insufficiency can be significantly improved and the discomfort of the legs caused by varicose veins, mild ankle swelling, leg fatigue, pregnancy edema and other related problems can be relieved. I. How to choose medical elastic stockings? According to the different pressure gradient, there are four types as follows: 1.One level pressure gradient (15-21)mmHg (health care type): capillary dilation, reticular varicose veins, C1 stage varicose veins with heavy lower limbs; 2.Second level pressure gradient (23-32)mmHg: varicose veins C2 stage C4, deep vein insufficiency, after vein stripping surgery, after endovenous laser coagulation, varicose veins with lower extremity swelling during pregnancy; 3.Tertiary pressure gradient (34-46)mmHg: varicose veins stage C4-C6, post-deep vein thrombosis syndrome, traumatic edema, congenital venous malformation of the lower limbs; 4, four pressure gradient >48mmHg: fixed edema, irreversible lymphedema patients. It is generally recommended to put on the medical elastic stockings when you get up and walk, and take them off when you rest at night. If you don’t feel too tight, too hot or allergic when wearing, it is recommended to wear it for a long time, and patients with venous ulcers are recommended to wear it for life. Who can’t use medical elastic stockings? Patients with the following diseases: 1. lower limb arteriosclerosis occlusive disease with intermittent claudication of the lower limb; 2. acute dermatitis, exudation or eczema, skin rupture with purulent infection; 3. deep vein thrombosis in the acute phase; 4. lower limb arterial bypass grafting; 5. decompensated congestive heart failure and other patients should be used with caution.