While atherosclerosis, which causes occlusion or bleeding of coronary and cerebral arteries, is well known to many middle-aged and elderly people, the abdominal aortic aneurysm, which is caused by it and can eventually be fatal, is less well known. Some sources report that the incidence of abdominal aortic aneurysms has increased 7-fold in the last 30 years, with a prevalence between 1-10% in people aged 60-70 years. Although called an aneurysm, abdominal aortic aneurysm is not a true tumor, but an arterial dilatation. The abdominal aorta is about 2 cm in diameter and if it dilates to 4-5 cm, it is called an abdominal aortic aneurysm. The disease is usually not uncomfortable, but the larger the abdominal aortic aneurysm, the faster it grows, and when it expands to a certain level, it will rupture and cause hemorrhage, and if it is not rescued in time, the mortality rate is even higher than that of a tumor. Therefore, the experts imaginatively call it the “time bomb” in the abdomen. Abdominal aortic aneurysm occurs mainly because of the loss of normal integrity of the arterial wall structure, such as injury, infection, etc., can cause structural defects in the abdominal aortic wall and form abdominal aortic aneurysm, but the most common cause is atherosclerosis of the artery itself, the vessel becomes brittle, which causes permanent expansion 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, in thinner people, if a longitudinally oriented, narrow, throbbing mass is felt to the left of the belly button, this is a normal abdominal aorta. In the case of middle-aged and elderly people over 50 years old with a history of atherosclerosis, especially those with a history of increased cholesterol, angina pectoris or hypertension, they can touch the part of the abdomen slightly to the left above the umbilicus with their own hands to see if they can feel a pulsating mass (in line with the pulse beat), and if they feel a round mass as large as a fist with a sense of beating, they are most likely to have an abdominal aortic aneurysm, and should immediately go to the vascular surgery department of the hospital. If you feel a round, fist-sized, throbbing lump, you are likely to have an abdominal aortic aneurysm. Only timely surgery is the key to saving the patient and reducing the mortality rate of the disease.