Mainly divided into thrombosis of superficial phlebitis and thrombophlebitis deep phlebitis two, the former is divided into limb thrombophlebitis superficial phlebitis, chest wall superficial vein thrombophlebitis and migratory superficial phlebitis thrombosis. The latter is divided into the calf muscle venous plexus thrombophlebitis and iliac vein and the popliteal vein thrombophlebitis phlebitis. The clinically When carefully according to the different characteristics of diagnosis.