Sclerotherapy for varicose veins requires local anesthesia. Sclerotherapy is used for the treatment of varicose veins with mild local symptoms and for varicose veins remaining after surgery. The main principle is that sclerosing agent injected into the diseased vein causes aseptic inflammation and then fibrosis of the blood vessel, which results in the therapeutic closure of the blood vessel and the alleviation of symptoms. Local anesthesia is required for this procedure. The main steps of sclerosing agent injection for varicose vein treatment include routine disinfection and toweling, local anesthesia around the blood vessels, ultrasound-guided localization and injection, and pressure bandaging of the lower limbs with an elastic bandage after the injection, so as to make the blood vessel wall sufficiently fibrotic and ultimately occluded.