When it comes to sudden death, I believe the first thing that comes to mind is heart disease. In fact, there is another fatal disease often overlooked, it is the lower extremity venous thromboembolism. If the thrombus is dislodged and flows to the narrow lumen of pulmonary artery, it will block the pulmonary artery, leading to pulmonary ischemia and oxygen deprivation, severe chest pain and difficulty in breathing, and even sudden death. Today we will take a look at this disease that should not be ignored – lower limb venous thrombosis. 1.How is the formation of lower extremity venous thrombosis embolism? The three elements of the formation are: damage to the vein wall, slow blood flow and blood hypercoagulation. This is easy to understand, just like the plumbing system at home, the blood in the veins contains more metabolic waste and is “heavily burdened” with low blood pressure and slow flow, just like the sewer that transports dirt and slowly carries away the waste produced in the body. If the wall of the water pipe itself is aging, the water flow in the pipe is slow or the water flow is very sticky, it will easily lead to the stagnation of the whole water pipe system. 2.What are the symptoms of lower limb vein thrombosis? Patients with lower limb vein thrombosis have various clinical manifestations and great individual differences, which can be manifested as swelling, numbness, pain, superficial venous anger, sunken edema, dark red skin, increased skin temperature, etc. A common symptom is the sudden appearance of swelling and pain in one lower limb and a sinking sensation, which is due to the inflammatory reaction triggered by the thrombus in the vein, producing persistent local pain. It can be found that one lower limb becomes thicker, the skin color changes such as bruising, dark red, etc., the superficial skin veins are dilated, and the dorsal curvature of the foot or pressure on the calf muscles can cause pain. 3.How to check to find the venous thrombosis? (1) Lower limb venous ultrasound Lower limb venous ultrasound examination is non-invasive, repeatable, easy to operate and inexpensive, therefore, venous ultrasound examination is the preferred method to diagnose lower limb venous thrombosis. (2) Lower limb venography Lower limb venography has been regarded as the “gold standard” for the diagnosis of lower limb venous thrombosis, which can not only determine the presence or absence of thrombosis, but also provide detailed information about the location, scope, shape and lateral circulation of thrombosis. 4.Who should pay high attention? Long-term bedridden, trauma or fracture, major surgery, pregnancy, childbirth, long-distance car or airplane ride, or long time sitting and squatting position, etc. All these causes can lead to slow blood flow and stagnation, thus promoting the formation of deep vein thrombosis in the lower limbs. There are many reasons for the formation of venous thrombosis, and the incidence of venous thrombosis is showing a younger trend. Long hours on the Internet, office work, irregular living habits, sports injuries, smoking, etc. can lead to the formation of lower extremity venous thrombosis in young people. 5.How to prevent? Thrombosis makes is a headache for everyone. It is difficult to find out that it is insidious, and it is also difficult to control once it develops. High-risk people should pay attention to prevention in general. 1) Eat less high-fat and high-sugar food to reduce the increase of blood viscosity. 2) Exercise more to promote blood circulation and reduce the probability of thrombosis. (3) Drink more water, which is good for blood circulation and reduces blood viscosity, and can well prevent the formation of blood clots. 4) Regular blood examination, especially blood test, blood sugar, blood lipid, coagulation function, can timely find the problems of blood, help us to find the problem early and prevent it early. Venous thrombosis can be life-threatening. Therefore, once a venous thrombosis is detected, relevant treatment should be taken immediately. It can be treated with anticoagulant drugs or thrombolytic methods, either of which can relieve clinical symptoms. Patients with venous thrombosis should also be careful not to do strenuous exercise, and the diet should be light.