Thrombophlebitis refers to the inflammatory reaction of the vein wall of subcutaneous superficial veins due to different reasons, which leads to thrombosis and lumen adhesion and occlusion, and it is a common disease in clinic. Drug thrombophlebitis This kind of phlebitis is caused by intravenous injection, mostly in the limbs, the drugs injected are irritating or too high in concentration, some antibiotics such as erythromycin, tetracycline, etc., or some anticancer drugs are irritating to the lining of the vein, together with the use of drugs for a long time or the vein is thin, or a vein is repeatedly punctured and so on. After the onset of the disease, the patient complains of pain and redness at the site of intravenous injection, and there is a pressure-painful cord along the direction of the vein. Generally, the redness and swelling subside after 1-2 weeks, replaced by hyperpigmentation and hardening of the cords like rope, and there is no obvious systemic reaction. Treatment is based on elevation of the affected limb, localized hot compresses or physiotherapy, and most of them can be cured without treatment. Individual superficial vein thrombosis to deep vein reproduction, feasible superficial vein high ligation. Thrombophlebitis of varicose veins In the varicose veins of the lower limbs, due to blood stagnation, coupled with local skin malnutrition, the barrier effect is weakened, which is easy to cause bacterial invasion, or due to local trauma caused by varicose veins inflammatory reaction. Due to the existence of varicose veins, phlebitis can also occur repeatedly with skin pigmentation, hardening of thrombus mechanization, occlusion of varicose veins and self-cure. It may also be completely absorbed and the varicose vein may remain as it was before. Treatment includes elevation of the affected limb, localized hot compresses or physiotherapy, and oral antibiotics. If the lesion is not severe, it can be moved with the support of elastic bandage or elastic stocking. After the inflammation subsides, high saphenous vein ligation and stripping should be performed. The cause of this disease is unknown, and some patients have a history of trauma. It occurs at the age of 20-40 years, mostly in obese women and women who lack exercise, and is often unilateral. Mostly in the upper limbs after straining, the affected side of the chest, abdominal wall pain, upper limb lifting or abduction aggravated. Examination can be found in the chest and abdominal wall there is a pressure pain hard tough cord, a few dendritic. When the skin is taut, the cord can be seen as a groove-like depression or ridge-like elevation, which is bowstring-like. The pain may resolve spontaneously after two weeks, and the cords tend to persist for a long time and then gradually soften. The treatment of this disease can be decided according to the duration of the disease: short duration of the disease (<1 month), oral prednisone 5mg, 3 times a day, for 1 week. Local physical therapy or hot compresses can accelerate the decline of inflammation. For long duration (>1 month), localized closed therapy can be used once a week for 3 weeks. Often, local heat or physical therapy is sufficient and need not complicate treatment. A small number of occluded venous cords contracture, so that there is always a local pulling sensation of the patient, can be used to pierce the skin with a sharp knife, the cords will be cut off subcutaneously, in order to alleviate the pulling symptoms. 4.Wandering thrombophlebitis This kind of lesion is recurrent superficial phlebitis in different parts of the body. It can occur in all veins of the body, and is more common in the lower limbs. The cause of the disease is not clear, but it occurs mostly in young and middle-aged men and is closely related to visceral cancer and thromboembolic vasculitis. Some of the patients were later found to have visceral tumors, especially pancreatic cancer, and some were found to have thromboembolic vasculitis. The lesions mainly invade small and medium superficial veins, and occasionally invade mesenteric veins, portal veins or renal veins. Clinical manifestations are mostly the sudden appearance of redness, stripes or reticular cords, lesion pressure and pain, systemic reaction is not obvious. 1-3 weeks later, it can be relieved on its own, the lesion is left with hyperpigmentation, and after a period of time, another part of the disease reoccurs. The treatment is mainly symptomatic, but should carefully find out whether there are visceral tumors or thromboembolic vasculitis and other diseases.