Complications after varicose vein hot fusion surgery include bleeding, infection, lower extremity swelling, lower extremity vein thrombosis and several others. 1. Bleeding: Varicose vein hot melt surgery process may cause blood vessel damage, resulting in blood vessel leakage, which can cause bleeding complications. 2. Infection: Infection of surgical incision and secondary infection of lower extremity wound can be caused by improper care. 3. Swelling of the lower limbs: due to surgical trauma, the blood return to the lower limbs is affected, causing the liquid in the blood vessels to ooze out, which will easily make the lower limbs swollen. 4. Lower extremity venous thrombosis: Ligation of the deep femoral vein during surgery, simple surgical stimulation and other conditions can cause lower extremity deep vein thrombosis. Complications after varicose vein hot fusion surgery must be actively handled and treated under the guidance of professional doctors. At the same time, you need to pay attention to rest and avoid large movements.