Lower extremity varicose veins are common lower extremity venous diseases, and the examination is as follows: 1. It is recommended that patients have lower extremity venous ultrasound, which can assess whether the varicose veins are combined with deep vein thrombosis and other symptoms of deep vein insufficiency; 2. If the lower extremity varicose veins are found to be combined with deep vein thrombosis through ultrasound examination, it is relatively contraindicated for surgery. In addition to the ultrasound examination of the veins of the lower extremities, for patients with varicose veins of the lower extremities, blood tests, electrocardiograms and chest radiographs need to be performed before surgery to assess whether the patient has heart disease, whether the patient can tolerate the surgery of varicose veins of the lower extremities, whether the patient has bleeding risk, whether the coagulation and blood routine are normal, whether there are abnormalities in coagulation, whether the patient can tolerate the surgery of varicose veins, and also to Assess whether the patient has infectious diseases; 3. If the patient is found to have infectious diseases through the blood system examination, then the operating room and surgical supplies need to be specially treated.