Maintaining the same posture for a long time can easily lead to poor blood flow in the lower limbs and the formation of blood clots. Venous thrombosis is a clot that occludes blood vessels, causing blood to circulate, causing limb swelling and pain, as well as clinical manifestations such as superficial vein dilation and varicose veins. After returning to the heart, it will enter the lungs to complete the exchange of oxygen. Deep vein thrombosis only slightly adheres to the vessel wall at one end of the blood vessel, and the other end of the thrombus floats freely in the vessel wall. Hot compress, massage and squeeze the lower limbs It is easy to make the thrombus fall off, and it will flow into the heart with the blood, and finally "stuck" in the pulmonary artery, causing the pulmonary artery blood flow to be blocked, which will cause cough, chest tightness and other symptoms, and even cause asphyxiation and death, that is, pulmonary embolism. What is wrong with this text is:. ['It is wrong to use hot compress and massage to relieve venous thrombosis.', 'Deep vein thrombosis is more dangerous than superficial vein dilation.', 'Preventing venous thrombosis requires people to exercise.', 'Blocking is the original sin of blood clots.']