The silent expansion of the body's main oxygen highway

Science · Published 24 October 2026 Swipe more like this →

In short: The aorta is the primary artery carrying oxygenated blood from your heart to your body. When it develops an abdominal aortic aneurysm, it creates a balloon-like swelling. Because these often develop silently without symptoms, early detection through screening is critical to prevent life-threatening ruptures.

An abdominal aortic aneurysm (AAA) occurs when the abdominal aorta—the main artery usually about 2cm wide—swells into a balloon-like shape. While many aneurysms do not cause immediate problems, they pose a significant risk of rupturing, which can lead to internal bleeding. The condition is often asymptomatic, meaning many people are unaware they have one until it is discovered during a screening or while being tested for another medical condition.

This condition relates to atherosclerosis, which involves fatty deposits accumulating within the arteries. Risk factors are well-documented: men over 65 and women over 70 are at the highest risk, though a family history of AAA can necessitate earlier screening. Other contributing factors include high blood pressure, high cholesterol, smoking, alcohol consumption, and excess weight. Understanding these mechanisms is essential for management, as lifestyle changes like quitting smoking and eating healthily can help prevent an existing aneurysm from growing.

Diagnosis typically relies on an ultrasound scan of the abdomen, a procedure taking about 10 to 15 minutes. Clinicians categorize the size of the aneurysm to determine the urgency of treatment: small (3cm to 4.4cm), medium (4.5cm to 5.4cm), and large (5.5cm or bigger). Surgery is generally considered for large aneurysms, those growing rapidly, or those causing persistent pain. In contrast, smaller aneurysms may be managed with medications to lower blood pressure and cholesterol. In the event of a rupture, sudden severe pain, breathlessness, or fainting constitute a life-threatening emergency.

This overview provides a concise summary of the pathophysiology, diagnosis, and management strategies for AAA to turn healthcare education into collaboration.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

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