What will happen if DVT is tolerated? Lower extremity DVT is divided into acute and chronic phases. Generally, it is called acute phase from the beginning of leg pain and swelling to within 14 days; 14 to 30 days is called subacute phase, and after 30 days of onset, it is chronic phase. Why is it staged like this? This is because the acute phase of lower extremity DVT is very dangerous and prone to a very serious complication – pulmonary embolism, causing difficulty in breathing or even asphyxiation, which will eventually kill you! So why does an embolism in the leg lead to pulmonary embolism? First recognize how blood circulates in the human body. The human blood circulation system is divided into the arterial system and the venous system. The arterial system is the arterial blood ejected from the heart, which reaches all parts of the body through the aorta and participates in the metabolism; the venous system is the venous blood of the whole body which reaches the blood vessels of the lungs through the superior and inferior vena cava and finally returns to the heart. The thrombi in the deep vein vessels of the lower extremities will not just stay there obediently, they are likely to fall off, go simmering along the blood flow, and finally block the blood vessels in the lungs. For example, when the patient moves down to the ground, the blood clots will be easily dislodged. Once the blood vessels in the lungs are blocked by the large blood clots, the patient will have difficulty in whistling, coughing, and chest pain as emergency symptoms, which can lead to death in severe cases. Some patients have pain for a few days without much treatment, but find that they don’t have much pain anymore, thinking that this is their own well. In fact, this is not the case, as long as the deep veins of the lower extremities have thrombosis, thrombus is spreading every day, the medical term “positive feedback” – blood vessel wall growth of blood clots, will stimulate more clotting factors in the place to gather, the formation of more blood clots. Maybe today ultrasound, thrombus only a little, a few days will grow to 10 cm, 20 cm, when the thrombus completely blocked the blood vessel, but not particularly painful. At this point has passed the acute stage, in the subacute stage as well as the chronic phase of the symptoms are not quite the same. Why is this disease soaking feet, leg rubbing is not good? In fact, daily foot soaking, leg rubbing for the prevention of lower extremity deep vein thrombosis is effective, but once the thrombus, massage, leg rubbing is not only useless, but also prone to cause thrombus shedding it. Soak your feet when the lower extremity blood vessels will also heat expansion and contraction, lower extremity veins, “bruising” of the situation is more serious. Therefore, the acute period do not soak feet, legs, massage; chronic period can soak feet, but the water temperature should not exceed 40 ℃, the water temperature is too high, easy to aggravate the condition. Since it is so dangerous, once the leg swelling and pain should immediately go to the hospital? Or find what specific signals when then go to the hospital? First of all, leg swelling, pain in daily life is relatively common, not once the wind is to go to the hospital, the patient can be based on the above 2 tips (straight leg and ankle extension test and gastrocnemius muscle pain) at home to see for themselves, suspected of thrombosis caused by the need to go to the hospital as soon as possible. Secondly, there is a Wells scale, the corresponding symptoms if there is 1 point, no is 0 points, according to the total score to determine the possibility of lower limb thrombosis. Generally speaking, the total score of less than 0 is unlikely; if the total score of 1 to 2 points, indicating the possibility of thrombosis; if the total score of ≥ 3 points, it is more dangerous to go to the hospital as soon as possible to check for blood clots.