An aneurysm is a permanent abnormal expansion of an artery resulting from localized weakness. It is caused by atherosclerosis, infection, necrosis of the middle layer of the artery, or congenital factors that cause the arterial vascular wall structure to lose its normal integrity and expand like a local balloon under the action of intra-arterial blood pressure. Aneurysm is not a real tumor, but it is very dangerous. Once the aneurysm ruptures, it will cause hemorrhage and if not treated in time, the patient will die from hemorrhagic shock. With the advent of aging population and change in diet structure, the incidence of aneurysm, especially abdominal aortic aneurysm, is on the rise in China. Abdominal aortic aneurysm in the elderly is a balloon-like mass formed when the abdominal aorta, a large blood vessel in the abdomen, becomes dilated due to the loss of elasticity in the walls of the arterial vessels as a result of aging (atherosclerosis). However, this mass is not filled with gas but with flowing blood, and due to the constant impact of blood flow, the mass will rupture when it expands and deforms to its limit. The abdominal aorta is close to the spine, and abdominal aortic aneurysms are also located deep in the abdomen of the human body, so they are not easily detected at an early stage, and once they rupture, they are fatal. Statistics show that the incidence of abdominal aortic aneurysm is about 8.8% in people over 65 years old. Many patients die from sudden rupture of the aneurysm without any symptoms, resulting in hemorrhage and a mortality rate of more than 90 percent. So what exactly are the telltale signs of abdominal aortic aneurysm that will allow us to identify this invisible killer as early as possible? Abdominal aortic aneurysm can be asymptomatic, because the cause of the disease is mainly atherosclerosis, so there are often symptoms of kidney, brain, coronary atherosclerosis, middle-aged and elderly people with hypertension, coronary heart disease, cerebrovascular disease should do ultrasound examination of the abdominal aorta. Most abdominal aortic aneurysms are initially noticed as a pulsating mass in the abdomen, when the aneurysm is already relatively large. In symptomatic patients, the common symptom is a pulsatile abdominal mass. This is followed by dull pain around the umbilicus or in the upper abdomen, or just abdominal discomfort. When the aneurysm invades the lumbar spine, there may be lumbosacral pain. Sometimes the aneurysm enlarges and may even penetrate into the duodenum or jejunum, thus producing signs of gastrointestinal bleeding. In addition, the enlarged aneurysm may produce some compression symptoms, such as jaundice due to compression of the common bile duct; intestinal obstruction due to compression of the duodenum; renal colic or hematuria due to compression of the ureter; frequent urination and fluctuating urine flow may occur when the bladder is compressed. Sclerotic plaque debris or attached thrombus dislodged from the aneurysm can cause arterial embolism in the lower limbs, resulting in acute or chronic ischemic symptoms in the lower limbs. On examination, a swollen pulsating mass can be found around the umbilicus or in the middle and upper abdomen, and the diameter of the aneurysm varies from 4 to 20 cm. In the early stage of the disease, there is no pressure pain on the surface of the tumor, but when it increases to a certain degree, there may be different degrees of pressure pain; systolic murmurs can be heard. Some patients may have ischemia of the lower extremities, such as cold legs, weakened or absent pulsations of the posterior tibial and dorsalis pedis arteries. When the tumor compresses the iliac vein, it may cause swelling of the lower extremities and compression of the spermatic vein causing varicocele. Ultrasonography is extremely important for a definitive diagnosis. Currently, many cases are detected during routine ultrasound physical examinations, and the detection of this type of aneurysm is gradually increasing with the development of regular physical examinations. Ultrasonography can reveal the following issues: 1. the presence or absence of abdominal aortic aneurysm; 2. the size of the aneurysm; 3. the presence or absence of thrombus formation in the aneurysm lumen, the site, size, and extent of the thrombus and the size of the channel caliber in the aneurysm lumen; and 4. the magnitude of the aneurysm pulsation. Once abdominal aortic aneurysm is found, it is not necessary to be overly nervous, and should be actively dealt with under the guidance of a doctor. For abdominal aortic aneurysms smaller than 5 cm, they can be closely observed and regularly examined by ultrasound. Those with signs of enlargement or near rupture should be operated immediately, but even for those with smaller aneurysms, there is also the possibility of acute rupture. Patients with abdominal aortic aneurysms larger than 5 cm should not be reluctant to treat them, but should reduce their activities, control their blood pressure, avoid rupture caused by mood swings, protect their abdomen from bumps, and go to the hospital for treatment as soon as possible. The famous physicist Albert Einstein and China’s famous geologist Li Siguang both died because of ruptured abdominal aortic aneurysms, when medical conditions were limited. In particular, with minimally invasive treatment of abdominal aortic aneurysms using stent endoluminal isolation, patients generally do not need to be admitted to the intensive care unit (ICU), they can eat on the day of surgery, and they can usually get out of bed and walk around the next day, with an average hospital stay of only about one week, which is advantageous in terms of surgical comfort and postoperative recovery.