What is “Economy Class Syndrome”? “Economy class syndrome”, also known as “lower extremity deep vein thrombosis” or “travel thrombosis”, refers to passengers who travel in economy class and sit in a relatively small seat for a long time without moving. It refers to passengers who travel in economy class on airplanes and sit in relatively small seats for a long time without moving, resulting in blood stagnation in the veins of both lower extremities and clotting to form thrombus, which can be dislodged after getting off the plane and reach the pulmonary artery via the right ventricle with the blood flow, blocking the pulmonary artery, which is called “pulmonary embolism” in medicine. Since there are frequent reports of fatal “pulmonary embolism” after traveling in economy class, this phenomenon has been called “economy class syndrome”. After traveling for more than 20 hours from Australia, a 28-year-old British woman collapsed at the airport in London and died two hours later in a British hospital. This was the first reported case of “Economy Class Syndrome”. Since then, it has been reported one after another. The risk groups for “Economy Class Syndrome” are: 1) people with a history of blood clots; 2) patients with abnormal coagulation; 3) patients with previous injuries to the inner walls of blood vessels in the lower extremities; 4) pregnant women or people who have recently given birth and have been taking oral contraceptives for a long time; 5) patients who have recently undergone foot surgery or fractured their feet; 6) patients with diabetes, hyperlipidemia, atherosclerosis; 7) patients who have recently undergone foot surgery or fractured their feet, 6, patients with diabetes, hyperlipidemia, arteriosclerosis; 7, obese people; 8, smokers. Preventive measures for “economy class syndrome” 1. wear loose and soft clothes and shoes when traveling; 2. drink water, juice or milk frequently to replenish water; 3. avoid alcohol and coffee drinks; 4. avoid crossing legs and knee joints to avoid pressure on the back of the knee joints; 5. change sitting posture frequently and try to order seats against the aisle, which can facilitate standing or walking away from the seat; 6. Stand or walk away from the seat; 6. Avoid long hours of sleep. Do health exercises in situ: ankle wrap-around exercise or toe lift with heel on the ground, then toe point with heel lift to promote contraction of the posterior calf muscle groups for 30 seconds each; or slowly lift the knee joint towards the chest for 10-15 seconds respectively, while actively and consciously contracting the thigh muscle groups. If you are at high risk of deep vein thrombosis and have to travel long distances in a small space, do not forget the above precautions to stay away from deep vein thrombosis; if there is a 1 in 2,000 chance of it happening, please seek medical attention in time to avoid and reduce the 1 in 10,000 tragedy. “Economy class syndrome” is not rare, and is not unique to economy class. In fact, whether it is by plane or train, bus, or even in the office, as long as it is sitting still for a long time, it can happen.