If you have to sit or lie down for a long time, you should also find ways to do some leg exercises to keep the blood circulation smooth and not to give the venous thrombosis a chance to take advantage of it. Studies have reported that people who sit at a desk for more than 3 hours a day in a fixed sitting position have twice the risk of developing deep vein thrombosis in the lower extremities of other people. The study also showed that whether the total time spent sitting still during the day is too long, or a certain time of the day is sedentary, will increase the risk of deep vein thrombosis, and each additional hour of sitting, the risk of blood clots will increase by 20 percent. This research results for the office white-collar workers and like to spend all day staring at the computer in front of the Internet or play games, “the table of a family”, and must often travel long distances by plane, car or train, “business travelers” health alarm bells ringing. In recent years, the sudden death of white-collar elite cases are often reported in the press, medical doctors in their autopsy found that many people are due to thrombus embolism off and brought to the lungs with the blood flow, causing serious pulmonary embolism and sudden death. Since about 80% of deep vein thrombosis has no obvious symptoms in the early stage of development, and only when it comes to the attack will the symptoms of swelling, swelling and pain in the lower limbs appear, so it often fails to attract enough attention from patients. He suggested that patients should pay more attention in their daily work and life, and if they have to sit or lie down for a long time, they should find ways to do some leg exercises to keep the blood circulation smooth, so as not to give a chance to thrombosis. Deep vein thrombosis is a common vascular surgery disease in clinical practice. In the mid-19th century, Virchow proposed three major factors for the formation of venous thrombosis, namely, venous blood flow stagnation, venous wall damage and blood hypercoagulation. In recent years, through a large number of clinical and experimental observations, not only the specific content of each factor, but also the test method can be confirmed. However, among the three factors mentioned above, any single factor is often not enough to cause disease; it must be a combination of factors, especially slow blood flow and hypercoagulable state, that may cause thrombosis. In fact, venous thrombosis is completely preventable, and there are various ways to prevent it. Deep vein thrombosis occurs mostly in people who are bedridden after various surgeries, chronic diseases, and those who have limited limb movement due to various reasons. Venous thrombosis includes deep vein thrombosis and pulmonary embolism, routine autopsy proves that 10% to 25% of hospital deaths are related to pulmonary embolism, and about 1% of hospitalized patients die from pulmonary embolism, patients with venous thrombosis start asymptomatic, and more than 90% of the disease culprits originate from the deep veins of the lower extremities, and 2/3 of the deaths from this disease occur within 1 to 2 hours. Venous thrombosis (VTE) is a type of disease caused by the formation of blood clots in the veins, which can lead to deep vein thrombosis and its serious complication, pulmonary embolism, which can be fatal. Deep vein thrombosis and pulmonary embolism are closely related, and they are actually two manifestations of the same disease. Venous thrombosis is one of the most common cardiovascular diseases after ischemic heart disease and stroke, with a considerable incidence and mortality rate. Venous thrombosis is also a common cause of death in humans, killing more than 5 million people worldwide each year. Despite the potentially life-threatening nature of venous thrombosis and its high morbidity and mortality rates, treatment of this disease has not received the attention it deserves among medical and surgical practitioners and the general population. Recently published findings suggest a possible association between air travel and venous thrombosis. It is surprising that the incidence of venous thrombosis, such as major orthopedic surgery, is so high that this disease, with a risk of death thousands of times higher than some diseases, has not received enough attention from physicians. This situation is related to two factors: first, the disease can be asymptomatic, with approximately 80% of patients with venous thrombosis being asymptomatic and only a minority of fatal and non-fatal pulmonary embolisms being detected before onset; second, the disease has a delayed onset, with more than 60% of patients developing the disease after discharge from the hospital. Most surgeons do not see a thrombogenic event occurring during the few days that a patient is in the hospital. This explains why, despite global guidelines for prevention and treatment, prophylaxis for this disease is misused or underutilized. There are various methods of venous thrombosis prophylaxis with proven efficacy, both mechanical and pharmacological. However, even with the application of multiple prophylaxis methods, the consequences of venous thrombosis in certain high-risk groups, such as patients undergoing major orthopedic surgery, remain heavy and unpromising! If left untreated, up to 60% of patients will develop DVT and 10% of them will die from the disease. The number of preventable deaths from this disease may be 17,000 per year worldwide. Some scholars have begun studies on the prophylactic placement of inferior vena cava filters to prevent fatal pulmonary embolism in orthopedic high-risk groups. Most DVT can be prevented by trying to move the legs more often. Long-term sedentary people may try the following tricks: 1. If you can’t avoid being sedentary every day because of your work, you can do some in-situ exercises, such as small-amplitude leg exercises like stepping on the pedal of a sewing machine. Conditions can be appropriate to raise the legs, and from time to time pat the legs with your hands or do a simple massage. 2, if the conditions permit, it is recommended to sit at the table for an hour or so should get up and move, and appropriate to do some leg and foot exercises. 3, to develop good habits, work and don’t forget to properly hydrate, so that the blood is not too sticky to affect blood circulation. In addition, to a reasonable diet, quit smoking and limit alcohol, some studies have shown that alcohol and tobacco can cause damage to the blood vessel wall. 4, women wear elastic stockings to help promote blood circulation in the legs. 5, 40 – 50 years old and above to reduce the frequent long-distance air travel. Because older people’s blood vessels are likely to harden, coupled with low air pressure in the cabin and more water loss in the body, can make the blood thicker than usual, often in this state, the risk of venous thrombosis of the lower extremities will be higher.