The above symptoms are seen in thrombotic superficial phlebitis when strips or hard nodules appear along the superficial veins with redness, burning, pain or pressure, and after the acute phase, the cords become hard and local skin pigmentation. What are the causes of local venous sclerosis? 1, chemical stimulation caused by superficial phlebitis, intravenous injection of various irritant solutions, such as: hypertonic glucose solution, various antibiotics, hydrocarbon agent, organic iodine solution, etc., can be injected in the superficial venous lining brewed chemical stimulation, resulting in more extensive damage quickly thrombosis, followed by a significant inflammatory response. 2, catheter for continuous infusion can often make the vein wall suffer direct damage to thrombosis, and rapid inflammatory reaction. It is common in critical patients with large area burns, serious trauma and major surgery. 3, varicose veins of the lower extremities, whether they belong to the saphenous vein or the small saphenous vein, due to venous blood stasis in the skin of the foot and boot area. Often endured by nutritional changes, chronic infections can subject varicose veins to hypoxic and inflammatory damage leading to thrombotic superficial phlebitis. It is a clinically frequent and common disease. It can develop in both sexes and is more common in young adults. Superficial thrombophlebitis can occur in all parts of the body, usually in the extremities, followed by the chest and abdominal walls, with a few wandering episodes. The clinical features are: sudden onset of redness, burning, pain or pressure along the superficial veins, and the appearance of streaks or hard nodules. After the acute phase, the cords harden and the skin becomes pigmented locally. It belongs to the category of blood paralysis, vein paralysis, swelling and blood stasis in Chinese medicine. At the onset, the superficial vein is a hard cords and may have spontaneous pain. Tenderness or pulling pain is generally called “pulse paralysis”.