“Economy class syndrome”, also known as “lower extremity deep vein thrombosis” or “travel thrombosis”, which refers to passengers traveling in the economy class of airplanes, due to the prolonged sitting in relatively small seats, resulting in blood stagnation in the veins of both lower extremities to coagulate and form blood clots. It refers to passengers traveling by airplane economy class, due to long time sitting in a relatively narrow seat without moving, resulting in blood stagnation of the veins of both lower limbs, blood coagulation occurs to form a thrombus, and after getting off the plane activities, the thrombus falls off, and with the blood flow through the right ventricle to reach the pulmonary artery, blocking the pulmonary artery, that is, medically referred to as a “pulmonary embolism”, the consequences of which may cause respiratory difficulties, chest pain, etc., and in severe cases, may lead to sudden death. As there are often reports of fatal “pulmonary embolism” after traveling in the economy class of airplanes, people figuratively refer to this phenomenon as “economy class syndrome. In October 2000, a 28-year-old British woman who had traveled from Australia on an airplane for more than 20 hours collapsed at the London airport and died two hours later in a British hospital. This was the first report of “Economy Class Syndrome”. Since then, there have been more and more reports. Sedentary not exercise, be careful to be embolized “Economy Class Syndrome” high-risk groups 1, people with a history of thrombosis; 2, patients with abnormal coagulation function; 3, patients with injuries to the inner wall of the lower extremity blood vessels; 4, pregnant women or just after giving birth to a long-term use of oral contraceptives 5, recently underwent foot surgery or foot fracture patients; 6, diabetes, hyperlipidemia, atherosclerosis of the patients; 7, obese people; 8, smokers. 8, smokers. “Economy class syndrome” is not rare, nor is it unique to the economy class of airplanes. “Economy class syndrome” preventive measures 1, when traveling, wear loose and soft clothes and shoes. 2. Drink water, juice or milk regularly to stay hydrated. Avoid alcohol and coffee drinks. Avoid crossing legs and knee joints, and avoid pressure on the back of the knee. 5, often change the sitting position, try to order the seat by the aisle, can be convenient to leave the seat to stand or walk around. Avoid sleeping for a long time. 7, in situ health care exercise: ankle encircling movement or heel on the ground toes up, and then toes pointing to the ground heel up to promote the contraction of calf muscle groups behind each 30 seconds; or slowly respectively, uplift the knee joint toward the chest to keep 10-15 seconds, while the initiative conscious contraction of the thigh muscle groups. If you are a high-risk group of DVT, and you have to travel long distance in a small space transportation, please do not forget the above precautions to keep away from DVT; and if there is a 1 in 2,000 chance of DVT happening, please consult a doctor in time in order to avoid and minimize the 1 in 10,000 tragedy. “Economy Class Syndrome is not rare, nor is it unique to economy class air travel. In fact, it can occur when you are sitting still for a long period of time, whether you are traveling by plane, train, bus, or even in the office.