Spring is in full bloom, the sun is shining, and it’s time to go out and take a family trip. While traveling happily, be alert to the possible killer behind: deep vein thrombosis. Intervention home reminds you: transportation space is limited, long time ride, may trigger lower extremity deep vein thrombosis and even pulmonary embolism! Lower extremity deep vein thrombosis was once called “economy class syndrome”. Former U.S. President Richard Nixon caused deep vein thrombosis in his left leg after a long flight. Since then, it has been recognized that long-haul flights can cause DVT, which is called “economy class syndrome”. This is, of course, a figurative term for a particular setting. Deep vein thrombosis can also occur in trains and passenger cars, where space is equally limited. Therefore, many scholars advocate the term “travel syndrome”. So what is deep vein thrombosis? The veins in the human body are divided into two systems: superficial veins and deep veins, and the “veins” we can see are superficial veins, while deep veins are deeper and invisible to the naked eye. Deep vein thrombosis is the formation of blood clots in the deep veins that block the blood vessels. Of all the veins, the deep veins of the legs are the most prone to thrombosis. What are the consequences of deep vein thrombosis? After thrombosis, the blood cannot flow back effectively, just like a blocked sewer, the sewage cannot be discharged, resulting in blood stagnation and swelling of the limb far away from the blockage; if it does not pass, it is painful, and the swollen limb often has different degrees of pain, which is more obvious when walking on the ground, but the more terrible thing is that the thrombus falls off. Once the thrombus is dislodged, it will eventually enter the pulmonary artery along the blood circulation, causing pulmonary embolism. Pulmonary embolism is a very frightening emergency that is likely to result in death and has a low success rate of resuscitation. Why is it easy to form deep vein thrombosis when traveling long distances? The three main culprits of intravascular thrombosis are: blood hypercoagulation, slow blood flow, and intimal damage. In long-distance travel, the car or cabin in the lack of oxygen, repeated circulation of air, fatigue and forget to drink water …… these factors make the blood in a state of hypercoagulation. Many friends aboard the car or plane, the habit of sitting still in the seat to rest or sleep, the lack of exercise makes the blood flow slowed down. All of the above factors interact with each other, the blood is very easy to form blood clots. A survey found that: for ordinary people, more than 3 to 4 hours of sedentary seat is likely to occur pulmonary embolism; the longer the time, the higher the risk of deep vein thrombosis and pulmonary embolism. Pregnant women, people on oral contraceptives, people with high blood viscosity and other travelers whose blood is in a state of high coagulation are more likely to be favored by the disease. How to avoid thrombosis during travel? 1, travel clothing and footwear should be loose, so as to help blood circulation. 2.Don’t stuff your seat with luggage, so that your legs have enough space to move. 3.Get up and walk every once in a while, and do leg and whole body activities frequently. 4, when traveling, do not smoke; do not quote alcoholic beverages, smoke and alcohol will make the blood in a high state of coagulation. 5, sleep to maintain a comfortable state, do not cross your legs, do not tighten the body, because this will form a squeeze on the blood system. 6, drink more water, because the environment on the plane is very dry, water can make blood dilution, effectively avoid the formation of blood clots. 7, itself in a hypercoagulable state of travelers, before travel should consult with a doctor whether it is suitable for travel, or what special precautions should be taken, such as wearing long elastic stockings, oral anticoagulants, etc. If the painful swelling of the lower limbs suddenly appears during the travel, it is likely that the deep vein has formed a thrombus, which must not be taken lightly and should be seen by the interventional department or vascular surgery as soon as possible to avoid delaying the disease and causing sequelae or endangering life!