A blood clot is commonly referred to as a “blood clot” in the blood vessels, which blocks the passage of blood vessels in various parts of the body like a plug, resulting in the lack of blood supply to the relevant organs and causing sudden disability or death. In the human blood, there is a coagulation system and a fibrinolytic system. Under normal circumstances, the two are in dynamic balance to ensure the normal flow of blood in the blood vessels and no clots are formed. Under special circumstances, such as hardening, narrowing or damage of blood vessels, excessive sweating, low blood pressure, lack of water, prolonged sitting, long car rides or airplanes, etc., which can slow down the blood flow, thicken the blood concentration, cause hypercoagulation or weaken the fibrinolytic function, this balance will be broken, making people in a “clot-prone state “The blood flow is slow, the blood is concentrated and viscous, and the coagulogenic function is hyperactive or the fibrinolytic function is weakened. (1) When the thrombus does not completely block the arterial blood vessels, it will cause ischemia and atrophy of local organs; once the arterial blood vessels are completely blocked, it will cause ischemic necrosis of local organs. Heart attack and brain infarction are mainly caused by arterial thrombosis. (2) When the thrombus forms in the vein, the venous vessels become narrow, which will cause the obstruction of blood return and lead to the swelling of the limbs. Pulmonary embolism may be caused by dislodged venous thrombus, and the death rate of large pulmonary embolism is also very high. (3) In atrial fibrillation, thrombus will also be formed in the atrium, and the dislodged thrombus may lead to acute cerebral infarction and embolism of arteries in the whole body, and the death and disability rates are also very high. 2, most of the thrombus formation, before the onset, there are no symptoms and feelings, even to the hospital cardiovascular specialist routine examination, blood lipids, blood pressure, electrocardiogram, CT and all other indicators show normal. However, we can still detect the thrombosis in time by some symptoms in our body. If there is unclear speech, swollen and painful legs or feet, dizziness, weakness of hands and feet, lack of breath after sitting for a long time, chest tightness and chest pain, especially for the elderly, it is necessary to seek medical consultation in time. 3.Thrombosis is not only a disease of the middle-aged and elderly, but can occur at any age and at any time. People who are prone to thrombosis include: (1) people with family history, especially those whose parents and grandparents have cerebral thrombosis; (2) middle-aged and elderly people with hypertension, especially those with severe hypertension; (3) middle-aged and elderly people with coronary heart disease, rheumatic heart disease and arrhythmia, who are more likely to form cerebral thrombosis if atrial fibrillation occurs; (4) middle-aged and elderly people with diabetes and hyperlipidemia; (5) people who have had (5) middle-aged and elderly people who have had transient cerebral ischemic attacks without adequate attention and timely treatment; (6) middle-aged and elderly people with high blood viscosity and abnormal blood flow check; (7) middle-aged and elderly people with frequent headache, dizziness, numbness and weakness of limbs or abnormal sensation, as well as those who have a habit of smoking and drinking; (8) office workers who sit still in front of computer screen for a long time are prone to leg thrombosis. The blood clot is like a ghost wandering in the blood vessels, once blocking the “main traffic lane”, if not handled in time, it will paralyze the blood transport system, and the result is often fatal.