Varicose veins are very different from venous thrombosis. Varicose veins are mostly due to varicose nodules at the distal end of the lower extremities due to incomplete saphenofemoral valves and venous regurgitation, while venous thrombosis is an abnormal blockage in the blood vessels due to abnormal blood clotting. Varicose veins do not cause serious consequences, but only varicose nodules, distal hyperpigmentation, itching, and in severe cases, ulcers, while venous thrombosis, once dislodged, can form pulmonary embolism, which can manifest as chest tightness, shortness of breath, and coughing up blood in mild cases, and sudden syncope and even death in severe cases. In the middle and late stages of varicose veins, surgical treatment is recommended, and the surgical methods are simple, including high ligation and stripping of the saphenous vein, laser and radiofrequency treatment of the saphenous vein trunk, etc. After the venous thrombosis is found, bed rest must be given, and if necessary, inferior vena cava filter implantation is performed to prevent lethal pulmonary embolism, and thrombus aspiration and decompression treatment can also be performed.