Aortic Aneurysm: Types, Symptoms, and Treatment

An aortic aneurysm is a silent, potentially fatal bulge in the body’s largest blood vessel — and most people who have one do not know it until it ruptures. According to the CDC, aortic aneurysms and aortic dissections were listed as the cause of roughly 9,900 deaths in the United States in 2019, and they contribute to still more deaths as an underlying factor. The aortic aneurysm develops gradually as the aortic wall weakens and expands, often producing no symptoms for years. Understanding the types, risk factors, and monitoring strategies is essential, because early detection can transform this condition from a sudden catastrophe into a manageable one. For a broader view of cardiovascular and other serious conditions, see our medical conditions guide.

Understanding the Aorta and How Aneurysms Form

The aorta is the largest artery in the human body, originating from the left ventricle of the heart and extending down through the chest and abdomen before branching into the iliac arteries that supply the legs. It delivers oxygenated blood to virtually every organ. The aortic wall has three layers: the intima (inner lining), the media (muscular middle layer), and the adventitia (outer layer). An aneurysm forms when the media degenerates, causing the wall to thin and balloon outward under the constant pressure of blood flow.

As the aneurysm grows, wall tension increases according to the law of Laplace — a larger diameter means greater wall stress, which accelerates further expansion, creating a dangerous feedback loop. Most aneurysms grow slowly, often on the order of a few millimeters per year, but growth can be unpredictable. The primary danger is rupture, which occurs when wall stress exceeds wall strength. A ruptured aortic aneurysm carries a very high mortality rate, especially when the many patients who die before reaching a hospital are counted.

Aortic dissection is a related but distinct emergency in which a tear in the intima allows blood to surge into the aortic wall, splitting its layers and creating a false channel. A dissection can occur with or without a pre-existing aneurysm, tends to strike suddenly, and is one of the most time-critical emergencies in medicine. Aneurysm and dissection have overlapping but somewhat different risk profiles and require different management.

Types of Aortic Aneurysm

Abdominal Aortic Aneurysm (AAA)

Abdominal aortic aneurysms are by far the most common type, accounting for roughly three-quarters of all aortic aneurysms. They typically develop in the infrarenal segment — the portion of the aorta below the kidneys. The normal diameter of the abdominal aorta is about 2 centimeters; an aneurysm is generally defined as a dilation of 3 centimeters or more. AAAs are strongly associated with atherosclerosis, smoking, older age, and male sex. The U.S. Preventive Services Task Force recommends a one-time screening ultrasound for men aged 65-75 who have ever smoked.

Thoracic Aortic Aneurysm (TAA)

Thoracic aortic aneurysms occur in the chest portion of the aorta and are less common than AAAs. They are subdivided by location: the ascending aorta, the aortic arch, and the descending thoracic aorta. Ascending aortic aneurysms have a stronger genetic component and are associated with conditions such as Marfan syndrome, Loeys-Dietz syndrome, and bicuspid aortic valve. Descending thoracic aneurysms share more risk factors with AAAs, including smoking and high blood pressure. Thoracic aneurysms and the aorta they affect are also the usual setting for thoracic aortic dissection.

Thoracoabdominal Aortic Aneurysm

When an aneurysm spans both the thoracic and abdominal segments of the aorta, it is classified as thoracoabdominal. These are the most complex to repair surgically and carry the highest perioperative risk. They are categorized using the Crawford classification into types based on the extent of aortic involvement.

Symptoms and Warning Signs

The most dangerous feature of aortic aneurysms is that they are typically silent — causing no symptoms at all — until they become very large, press on nearby structures, rupture, or dissect. This is exactly why screening and awareness matter so much: you cannot rely on symptoms to warn you in time.

When symptoms do occur with an abdominal aortic aneurysm, they may include a deep, constant pain in the abdomen or lower back, and occasionally a pulsating sensation near the navel. A clinician may detect a pulsatile abdominal mass during a physical exam, though this finding is less reliable in people carrying more weight around the midsection.

Thoracic aortic aneurysms may produce chest or upper-back pain, hoarseness (from pressure on the recurrent laryngeal nerve), difficulty swallowing, or shortness of breath. Because these symptoms overlap with many other conditions, TAAs are particularly easy to miss.

A rapidly expanding or ruptured aneurysm — or an aortic dissection — is a medical catastrophe. Warning signs include sudden, severe pain in the abdomen, chest, flank, or back; a “tearing” or “ripping” quality to the pain (classic for dissection); dizziness or fainting; a rapid heartbeat; cold, clammy, or pale skin; and signs of shock. These symptoms should never be brushed off or attributed to indigestion, a pulled muscle, or ordinary back pain.

Risk Factors

Smoking is the single strongest modifiable risk factor for abdominal aortic aneurysm. Smokers are several times more likely to develop an AAA than nonsmokers, and the risk rises with the number of years smoked; smoking is linked to the large majority of AAAs. The chemicals in tobacco directly damage the elastin and collagen fibers that give the aortic wall its strength. According to the NHLBI, quitting smoking is one of the most impactful steps you can take to lower your risk and slow the growth of an existing aneurysm.

High blood pressure is another major contributor, as chronically elevated pressure accelerates aortic wall degeneration. Atherosclerosis — the buildup of fatty plaques in arterial walls — weakens the aorta over time and is closely linked to AAAs. Family history is significant: having a first-degree relative with an aortic aneurysm roughly doubles your risk. If your blood pressure is high, our guides on the symptoms of high blood pressure and lowering blood pressure naturally can help you understand the lifestyle side of control — alongside, never instead of, your doctor’s treatment.

For thoracic aneurysms, genetic connective tissue disorders are particularly important. Marfan syndrome, caused by mutations in the fibrillin-1 gene, leads to weakened aortic tissue and aneurysm formation at much younger ages. Loeys-Dietz and vascular Ehlers-Danlos syndromes carry similar risks. Bicuspid aortic valve, present in a small percentage of the population, is associated with ascending aortic dilation even without significant valve dysfunction. Older age, male sex, and white race are additional non-modifiable risk factors for both types.

Screening and Diagnosis

Because most aneurysms are asymptomatic, screening is the primary tool for early detection. The USPSTF recommends a one-time abdominal ultrasound for men aged 65-75 who have ever smoked; for men in that age range who have never smoked, it advises clinicians to selectively offer screening based on individual risk. Studies show that ultrasound screening in older male smokers reduces AAA-related death in screened populations. Women have a lower overall incidence but tend to rupture at smaller sizes; women who have smoked or have a family history should discuss screening with their clinician, though formal guideline recommendations for routine screening in women are limited. These recommendations can be updated over time, so confirm current screening advice with your doctor.

Abdominal ultrasound is the preferred screening test for AAA because it is noninvasive, inexpensive, and accurate. Once an aneurysm is detected, CT angiography (CTA) provides detailed three-dimensional imaging essential for surgical planning; CTA measurements are more precise than ultrasound and reveal anatomical details such as the aneurysm’s relationship to the renal arteries.

Thoracic aneurysms are often discovered incidentally on a chest X-ray, CT scan, or echocardiogram performed for another reason. MRI and MR angiography are excellent tools, particularly for serial monitoring, because they avoid radiation exposure. Patients with known genetic syndromes such as Marfan should undergo regular surveillance imaging, often beginning in adolescence and continuing for life.

Surveillance and Medical Management

Small aneurysms below the threshold for repair are managed with a “watchful waiting” approach that combines regular imaging surveillance with aggressive risk-factor control. For abdominal aortic aneurysms, typical clinician-directed surveillance intervals are periodic ultrasound (for example, annually for aneurysms in the 3.0-3.9 cm range and more frequently as they enlarge), with surgical consultation generally considered when the diameter reaches about 5.5 cm in men or 5.0 cm in women, or when an aneurysm grows rapidly. Your own surveillance schedule and thresholds are individualized by your vascular specialist.

Blood pressure control is paramount, because lower pressure means less stress on the weakened aortic wall. Physicians often aim for tight blood pressure control in patients with aortic aneurysms, commonly using beta-blockers, ACE inhibitors, or angiotensin receptor blockers. This guide deliberately does not list specific medications’ doses: the right drug and dose are individualized and set by your prescriber. Never stop or change a blood pressure medicine on your own — abruptly stopping certain medicines can be dangerous, and uncontrolled blood pressure raises rupture risk. Smoking cessation is essential, as continued smoking is associated with faster growth and higher rupture risk.

Statin therapy is often prescribed for patients with concurrent atherosclerosis, and some evidence suggests statins may modestly slow expansion through anti-inflammatory effects. Regular moderate exercise is generally encouraged, but patients are typically advised to avoid heavy lifting, straining, and other activities that cause large spikes in blood pressure. Discuss any exercise plan with your cardiologist or vascular surgeon.

Surgical and Endovascular Repair

When an aneurysm reaches the size threshold for repair — or is growing rapidly (often defined as more than about 0.5 cm in six months), causing symptoms, or has high-risk features — intervention is recommended. Two main approaches exist: open surgical repair and endovascular aneurysm repair (EVAR).

Open surgical repair replaces the diseased segment of aorta with a synthetic graft through a large incision. It remains a durable, definitive option and is often preferred in younger, healthier patients, but it requires a longer recovery and carries higher perioperative risk. According to the Society for Vascular Surgery, perioperative mortality for elective open AAA repair is on the order of a few percent in experienced centers, and the risk rises sharply for emergency repair of a rupture.

EVAR is a minimally invasive approach in which a stent graft is deployed through catheters inserted into the femoral arteries and guided into position within the aneurysm under imaging. EVAR has lower short-term morbidity and mortality and a faster recovery, making it attractive for older or higher-risk patients. However, it requires lifelong surveillance for endoleaks (persistent blood flow into the aneurysm sac around the graft) and has higher rates of reintervention than open repair.

For thoracic aneurysms, thoracic endovascular aortic repair (TEVAR) has similarly expanded options, though complex anatomy such as arch involvement may still require open or hybrid approaches. Because aortic surgery — open or endovascular — is among the more expensive cardiovascular interventions, understanding the costs associated with these procedures can help with financial planning.

Recovery and Long-Term Follow-Up

Recovery from open aortic surgery typically involves a hospital stay of several days with a total recovery period of a few months. Patients often begin walking within a day or two of surgery and gradually increase activity over roughly six to twelve weeks. EVAR patients may be discharged within one to three days and often return to normal activities within a few weeks.

Regardless of repair type, long-term follow-up is essential. After EVAR, CT scans (or other imaging) are typically performed at intervals — often around one month, twelve months, and periodically thereafter — to check for endoleaks, graft migration, and how the aneurysm sac is behaving. After open repair, surveillance can be less frequent but should still occur periodically, particularly to monitor for aneurysm development at other segments of the aorta, since having one aneurysm increases the risk of developing another.

Patients with genetic connective tissue disorders require lifelong monitoring of the entire aorta, as aneurysms can develop at multiple sites. Medical therapy, including blood pressure control and, in some cases, an angiotensin receptor blocker such as losartan in Marfan syndrome, remains a cornerstone of long-term management — always as directed by the treating physician.

Frequently Asked Questions

Can an aortic aneurysm heal on its own?

No. Aortic aneurysms do not shrink or resolve without treatment. Once the aortic wall has weakened and dilated, the process is not reversible. The goal of medical management is to slow growth and prevent rupture, not to reverse the aneurysm; surgical or endovascular repair is the only way to eliminate the rupture risk.

How common is aortic aneurysm?

Abdominal aortic aneurysms are found in a meaningful minority of older adults during screening — more commonly in men than women, and especially among those who have smoked. Thoracic aneurysms are less common but still affect a significant number of people, particularly those with genetic predispositions. Because most are asymptomatic, the true prevalence may be underestimated.

What is the difference between an aneurysm and a dissection?

An aneurysm is a bulging or dilation of the aortic wall. A dissection is a tear in the inner layer of the wall that lets blood flow between the layers, creating a false channel. Both are dangerous, but a dissection is typically an acute emergency with sudden onset, whereas an aneurysm usually develops gradually. The two can coexist — an aneurysm can dissect, and a chronic dissection can lead to aneurysmal dilation.

Should women be screened for aortic aneurysms?

Current USPSTF guidance recommends one-time ultrasound screening for men aged 65-75 who have ever smoked; it does not recommend routine screening for women who have never smoked and have no family history. Women have a lower overall incidence of AAA but tend to rupture at smaller diameters. Women who have smoked, have a family history, or have other risk factors should discuss screening with their clinician. Broader criteria for women remain an area of ongoing research.

Can you exercise with an aortic aneurysm?

Moderate aerobic exercise such as walking, cycling, and swimming is generally considered safe and beneficial for people with small, stable aneurysms. However, heavy weightlifting and activities that involve straining or breath-holding (the Valsalva maneuver) should be avoided, because they cause large spikes in blood pressure. Always confirm your exercise plan with your cardiologist or vascular surgeon.

Taking Control of Your Aortic Health

If you are a man over 65 who has ever smoked, get screened — a simple, one-time ultrasound could save your life. If you have a family history of aortic aneurysm or a known connective tissue disorder, ask your doctor about surveillance imaging regardless of your age or sex. Quit smoking if you have not already, keep your blood pressure controlled (with your prescribed medicines, not by stopping them), and keep every follow-up appointment.

An aortic aneurysm diagnosis is frightening, but outcomes have improved dramatically thanks to advances in imaging, medical therapy, and surgical technique. With appropriate monitoring and timely intervention, most people with aortic aneurysms live long, active lives. The key is finding the aneurysm — and treating it — before it becomes an emergency. And if the emergency warning signs at the top of this article ever appear, call 911 without hesitation.

Sources

• CDC — Aortic Aneurysm: cdc.gov
• National Heart, Lung, and Blood Institute — Aortic Aneurysm: nhlbi.nih.gov
• U.S. Preventive Services Task Force — Abdominal Aortic Aneurysm: Screening (2019): uspreventiveservicestaskforce.org
• Society for Vascular Surgery — Aortic aneurysm patient resources: vascular.org
• MedlinePlus (U.S. National Library of Medicine) — Aortic aneurysm: medlineplus.gov