The current international treatment of varicose veins in the lower extremities is manifested in three main areas: surgical evacuation surgery, endovenous laser treatment, and sclerotherapy. This is mainly due to the increasing cosmetic requirements and the aging population. Sclerotherapy is the injection of chemicals into the lumen of the blood vessels, which cause the intima to adhere to each other due to chemical inflammation, thereby occluding the lumen and producing tissue fibrosis for the purpose of treating the disease. Foam sclerotherapy is developed on the basis of traditional sclerotherapy, overcoming the shortcomings of traditional sclerotherapy, minimizing complications and recurrence rates, and broadening the indications, using its foam to enter varicose veins and push the blood out of them, so that the drug comes into direct contact with the vessel wall, causing intravascular thrombosis by blocking blood flow, producing inflammation, and damaging endothelial cells, and after 2 weeks of mechanization, forming strips of By blocking the blood flow, producing inflammation, and damaging the endothelial cells, the thrombus is formed in the blood vessel, and after 2 weeks, the thrombus is mechanized to form strips of fibers, thus completely occluding the blood vessel. Not all patients with varicose veins are suitable for sclerotherapy! According to long-term clinical observation, in order to ensure the safety and long-term effect of treatment, we still recommend minimally invasive laser surgery as the preferred treatment for varicose veins in the lower extremities, and we use foam sclerotherapy for patients who have a small number of varicose vein recurrence after surgery or who are intolerant to surgery or extremely afraid of incision.