Abdominal aortic aneurysm is usually asymptomatic in its early stages, or when it has not reached a certain size. Abdominal aortic aneurysms with a diameter of 4cm-5cm or less have a relatively small risk of rupture, and the patient has no obvious symptoms, but only occasionally feels a throbbing mass in the abdomen. It is usually not easy to detect in the early stage because the aneurysm does not cause much pain to the patient. As the aneurysm grows in size, other symptoms will appear. Symptoms of abdominal aortic aneurysm: Pain When the pain increases, it is often a sign that the aneurysm is about to rupture, or even has already ruptured, and by then it is too late. Sometimes the patient may feel the slightest pain, because the mass is large and uncomfortable. In the case of abdominal aortic aneurysms with a large diameter, the outer shell becomes so thin that it is painful to press on it. Arterial Embolism Due to the localized enlargement of the blood vessel, an eddy current is created when the blood flows, and this eddy current causes blood clots to form in the inner layer of the arterial wall, which is medically known as an attached thrombus. Once these clots are dislodged, they will flow with the blood to the lower limbs, causing embolism of the lower limb arteries. The patient will show sudden pain in the lower limbs, and even can’t walk. Doctor’s tip: Since abdominal aortic aneurysm is closely related to atherosclerosis, controlling the risk factors of atherosclerosis is an important measure to prevent the occurrence of abdominal aortic aneurysm. Especially for the elderly, they should check their blood pressure, blood lipids and blood sugar regularly, and if abnormalities are found, they should consult the doctor in time and be given treatment.