Thoracic aortic aneurysms can occur anywhere in the ascending, arch and descending segments of the aorta and are particularly likely to involve the arch and descending segments. Sometimes the entire aorta is dilated, while confined aneurysms occur in multiple locations in the thoracic and abdominal aorta. Descending aortic aneurysms often extend into the abdominal aorta to form thoracoabdominal aortic aneurysms. The most common cause is atherosclerosis, followed by cystic necrosis of the middle layer of the aorta, syphilis, infection, injury and congenital dysplasia. I. Pathogenesis The most common causes of thoracic aortic aneurysm are: atherosclerosis, non-specific aortic degenerative disease, followed by cystic necrosis of the middle layer of the aorta, syphilis, infection, injury and congenital dysplasia. 1, atherosclerosis atherosclerosis and non-specific aortic degenerative disease are the most common causes of thoracic aortic aneurysm formation, accounting for more than 50%. 2, aortic middle layer cystic necrosis aortic middle layer cystic necrosis thoracic aortic aneurysm is often combined with Marfan syndrome, showing obvious genetic characteristics. 3, trauma factors are mostly seen in traffic accidents, sudden deceleration in high-speed movement, so that the aortic intima and middle layer transverse tear, such as the ascending aorta rupture is very large or completely broken, the patient quickly hemorrhage death, too late to rescue. 4, infectious factors infective endocarditis infectious emboli blocked in the aortic wall of the nutrient vessels, the aorta adjacent to the foci of infection, such as abscesses, purulent lymphadenitis and abscess thorax, such as direct spread, or trauma, surgery caused by sepsis dissemination, in the past 10 years, syphilis infection patients have an increasing trend. Second, dietary care 1, avoid coffee, cocoa and other excitatory drinks. 2, avoid spicy and stimulating food. 3, avoid moldy, fried, fatty food. 4, avoid smoking, alcohol.