Questions about lower limb vein thrombosis 1.What is lower limb vein thrombosis? In terms of common sense, “running water does not rot”. The flow characteristics of blood in the blood vessels are similar to the way water flows in the pipes. If the blood flow in the veins of lower limbs is slowed down by various reasons under special circumstances, the blood is highly coagulated, and the original flowing blood will slowly lose its fluidity and finally turn into a solid shape and accumulate in the veins, forming a thrombus. Common causes include lower limb braking, special diseases that cause blood hypercoagulation (such as tumor, drugs, etc.), venous vascular injury, etc. 2.What are the main hazards of lower limb vein thrombosis to the organism? (1) Common manifestations and hazards Swelling of the affected limb. The degree and location of swelling are related to the extent of thrombosis. In case of deep vein thrombosis in the lower leg, there is only swelling and pressure pain in the lower leg. In the case of iliofemoral vein thrombosis, there is widespread swelling of the lower extremity with extensive superficial venous anger or varicosity. After deep vein thrombosis of the lower extremity, the skin color of the affected extremity is usually pale white due to the stagnation of blood in the veins and edema of the tissues, which is called white swelling of the femur. The skin temperature can be mildly elevated due to the enrichment of blood on the body surface by the return of blood through the superficial venous collateral circulation. When extensive thrombosis of the whole lower limb occurs and the limb is severely swollen, it may be accompanied by spasm of the artery of the limb, and the skin of the affected limb is bruised and blue, and the skin temperature decreases, which is called femoral cyanotic swelling or femoral bluish swelling. (2) The most serious complication of lower limb deep vein thrombosis is pulmonary embolism. The patient has sudden onset of clinical symptoms such as chest pain, cough, hemoptysis, which can cause respiratory and circulatory dysfunction and pleural effusion with large brakes in the lungs, and is the main cause of death. (3) Major sequelae The sequelae are related to the damage to the venous valves by thrombosis. Venous thrombosis in the lower extremities can permanently damage the function of venous valves, causing dysfunction and affecting venous blood return to the lower extremities. There may be swelling of the lower limbs after activity, pigmentation of the foot and ankle, and even local ulcers.