Contraindications to saphenous varicose vein surgery are first of all those with poor surgical tolerance and higher surgical risk. In addition, deep vein obstruction, or combined with acute phlebitis or systemic septic infection may aggravate embolism or infection after surgery, these people are contraindicated for saphenous varicose vein surgery and are not suitable for the surgery. The common clinical contraindications for saphenous varicose vein surgery include the following: a. Poor surgical tolerance: old and frail, pregnant and lactating patients; saphenous varicose vein patients with heart, lung, liver, kidney and other important organ diseases; coagulation disorders, such as hemophilia; combined with severe diabetes, hypertension, mental disorders; varicose veins of the lower limbs caused by Buga syndrome, etc. . Such patients have higher risk of surgery, and surgery may aggravate the original disease, or have adverse effects on pregnant women and fetus, so they are not suitable for surgery. Second, those with deep vein blockage: 1, lower extremity deep vein thrombosis: saphenous varicose vein surgery cannot be performed, and if surgery is performed on this basis, it will aggravate the deep vein thrombosis and may also lead to the risk of pulmonary embolism; 2, lower extremity deep vein congenital anomalies: including femoral vein occlusion, iliac vein stenosis and iliac vein occlusion. For such patients, surgery is also not allowed, otherwise, not only the saphenous varicose vein will not be relieved after surgery, but also the swelling of the limb will be aggravated, and in serious cases, deep vein thrombosis will be formed on the basis of occlusion and stenosis, which will have serious consequences. Third, combined with acute phlebitis or systemic septic infection: after surgery may aggravate the inflammation or systemic infection, you should actively follow the medical advice to apply drugs to control the symptoms of systemic infection, and then evaluate whether you can operate. Fourth, patients with congenital arteriovenous malformation: such patients have clinical manifestations of varicose veins, but in fact, they are not simply varicose veins, but have abnormal anastomosis of arterioles and veins, which are manifested as varicose veins of lower limbs. Once surgery is performed on such patients, not only will the symptoms not be relieved, but it may also cause more serious consequences, and in serious cases, postoperative complications such as excessive intraoperative blood loss. Therefore, for patients with saphenous varicose vein surgery, the preoperative surgeon should perform a general assessment to see if they can tolerate the surgery, as well as a screening ultrasound, including the deep veins and iliac veins of the lower extremities, and if necessary, a venous angiogram to clarify the presence of deep vein blockage and arteriovenous malformations. For patients who cannot undergo surgery, compression stockings are recommended to reduce the symptoms of swelling and pain in the limbs and to stop the progression of varicose veins.