Abdominal aortic aneurysms occur mainly because of the loss of normal integrity of the arterial wall structure, such as injury and infection, which can cause structural defects in the abdominal aortic wall and result in abdominal aortic aneurysms, but the most common cause is atherosclerosis of the artery itself, which makes the vessel brittle and thus causes permanent dilatation of the entire arterial wall. As a result, the disease is more common in middle-aged and elderly patients, with a relatively high prevalence in men. Patients are usually asymptomatic, painless, and in most cases are detected during a health checkup or during an ultrasound or CT to diagnose other diseases. Although abdominal aortic aneurysms have no obvious symptoms in the early stages, they can be detected on their own with a little attention. Usually, a normal abdominal aorta with a longitudinal course and a narrow strip of beating can be felt to the left of the navel in thinner people, but if a round lump with beating sensation like a fist is felt, it is most likely to be suffering from an abdominal aortic aneurysm, which should be examined in a hospital immediately for early detection and treatment. This is because only timely surgery is the key to saving the patient and reducing the mortality rate of the disease. How is abdominal aortic aneurysm treated and do I need surgery? Generally speaking, those under 3-4cm and without symptoms can be treated conservatively without surgery for the time being. Conservative treatment means controlling atherosclerosis, changing bad habits, such as quitting smoking, adjusting the diet, and controlling high blood pressure. At the same time, ultrasound Doppler examination or CT examination should be done every six months to a year to understand the progress rate of aneurysm and the change of size. When the aneurysm has reached 4-5 cm or more, surgical intervention should be considered. This is because at this time, the chances of aneurysm rupture are higher and the risk is high. What are the means of surgical intervention? There are two main surgical treatments for aneurysms: one is traditional open surgery, which involves cutting out the aneurysm and attaching an artificial blood vessel. Although this surgery is more invasive, it is more thorough and is a good treatment if the patient is generally well and tolerates the surgery well. Another surgical treatment is the stenting technique, which has been developed relatively rapidly in the last decade or so, to isolate the lumen of the blood vessel by placing a large stent with a membrane in the lumen of the aorta. The so-called isolation means that the stent is placed inside the vessel so that blood flows through the stent without exerting pressure on the aneurysm wall, thus avoiding the risk of aneurysm rupture. This technique is relatively new and less invasive, requiring only a small incision of four or five centimeters on each side of the thigh, which is called “intracavitary isolation. This method is particularly suitable for patients with severe cardiopulmonary insufficiency and other high-risk factors.