Thoracic Aortic Aneurysm: Symptoms, Causes, Treatment & Complete Guide
Updated: 3 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 2026
Quick Answer
A thoracic aortic aneurysm is a weakened, bulging area in the part of the aorta in the chest. It often grows slowly without symptoms, making it hard to find, but can cause back pain, cough or hoarseness. A rupture or aortic dissection is a medical emergency that can be fatal. Treatment ranges from monitoring and medicines to surgery.
What the research says
Surgery timing is becoming more individualized. The 2022 ACC/AHA aortic disease guideline lowered the threshold for surgery on sporadic aortic root and ascending aortic aneurysms from 5.5 cm to 5.0 cm in selected patients at centers with multidisciplinary aortic teams and experienced surgeons, and even lower in specific scenarios for heritable aneurysms; rapid growth (0.5 cm or more in 1 year, or 0.3 cm or more per year in 2 consecutive years) is itself an indication for intervention, and aortic imaging is recommended for first-degree relatives of people with root or ascending aortic aneurysms. (Isselbacher et al., Circulation, 2022) [3]
A beta blocker and an ARB performed similarly in Marfan syndrome. In a randomized trial of 608 children and young adults with Marfan syndrome, the rate of aortic-root enlargement over 3 years did not differ significantly between atenolol and losartan (−0.139 vs −0.107 z-score units per year; P=0.08). (Lacro et al., N Engl J Med, 2014) [4]
Statins were linked to slower aneurysm growth. A meta-analysis of 4 studies (1,850 patients) found a lower thoracic aortic aneurysm growth rate in statin users (difference in means −0.36 cm per year; 95% CI −0.64 to −0.08), and fewer events — death, dissection or rupture, or the need for repair — across 3 studies (2,867 patients; log odds ratio −0.56; 95% CI −1.06 to −0.05); the number of studies was small. (Myasoedova et al., Front Pharmacol, 2024) [5]
Thoracic Aortic Aneurysm at a Glance
Aspect | Summary |
Definition | A weakened area in the upper part of the aorta (the body's main artery) in the chest |
Also called | Thoracic aneurysm; if it spans the upper and lower aorta — thoracoabdominal aneurysm |
Compared to AAA | Less common than abdominal aortic aneurysms |
Typical growth | Slow; often symptom-free; growth rate is hard to predict |
Symptoms as it grows | Back pain, cough, weak scratchy voice, shortness of breath, chest tenderness or pain |
Emergency signs | Sharp sudden upper back pain spreading down the body; chest/jaw/neck/arm pain; breathing trouble; low blood pressure; loss of consciousness; trouble swallowing |
Main causes | Atherosclerosis, genetic conditions (Marfan, Loeys-Dietz, vascular Ehlers-Danlos), vessel inflammation, bicuspid aortic valve, infection (rare), trauma (rare) |
Risk factors | Age 65+, smoking/tobacco, high blood pressure, coronary artery disease, family history |
Complications | Aortic dissection, aortic rupture, blood clots, stroke |
Diagnostic tests | Echocardiogram, transesophageal echo, CT scan, heart MRI |
Surgery threshold | About 5–6 cm (1.9–2.4 in); earlier for high-risk patients |
Treatment path | Watchful waiting → medicines → open surgery / aortic root surgery / EVAR |
What Is a Thoracic Aortic Aneurysm?
A thoracic aortic aneurysm is a weakened area in the upper part of the body's main artery, called the aorta. When the aortic wall is weak, the artery may get wider. When it gets very wide, it's called an aneurysm.
This aneurysm can happen anywhere in the thoracic aorta — including near the heart. It is also simply called a thoracic aneurysm.
Two related terms are worth knowing:
If the aneurysm sits between the upper and lower parts of the aorta, it is called a thoracoabdominal aneurysm.
Thoracic aortic aneurysms are less common than aneurysms in the lower part of the aorta, known as abdominal aortic aneurysms.
What are the symptoms of a thoracic aortic aneurysm?
Thoracic aortic aneurysms often grow slowly, and there are usually no symptoms — which makes them hard to find. Many start small and stay small. Others grow bigger over time, and how quickly an aneurysm may grow is hard to predict.
Symptoms as the Aneurysm Grows
As a thoracic aortic aneurysm grows, symptoms may include:
Back pain
Cough
Weak, scratchy voice
Shortness of breath
Tenderness or pain in the chest
Emergency Symptoms: Rupture or Dissection
Symptoms that a thoracic aortic aneurysm has ruptured or caused a tear called an aortic dissection include:
Emergency Sign | What to Look For |
Sharp, sudden upper back pain | Spreads down the body |
Pain in the chest, jaw, neck or arms | Pain travels beyond the back |
Trouble breathing / shortness of breath | Difficulty getting air |
Low blood pressure | Sudden blood pressure drop |
Loss of consciousness | Fainting or blacking out |
Trouble swallowing | Difficulty swallowing |
Good news worth stating plainly: some aneurysms may never rupture or lead to dissection. But because most people don't have symptoms until one of these emergencies occurs, the default rule is simple — an aortic dissection or aneurysm rupture is a medical emergency. Call 911 or your local emergency number for immediate help.
What Causes a Thoracic Aortic Aneurysm?
Cause | How It Happens |
Atherosclerosis | A buildup of fats, cholesterol, and other substances in and on the artery walls makes the arteries stiff. Over time, the walls weaken. High blood pressure and high cholesterol raise the risk, especially in older people |
Genetic conditions | Aneurysms in younger people are often caused by gene changes. Marfan syndrome weakens the aortic wall. With Marfan syndrome or related conditions such as Loeys-Dietz syndrome or vascular Ehlers-Danlos syndrome, the risk of a thoracic aortic aneurysm is much higher — and so is the risk of rupture or dissection |
Blood vessel inflammation | Conditions that cause irritation and swelling of blood vessels, such as Takayasu arteritis and giant cell arteritis, are associated with thoracic aortic aneurysms |
Bicuspid aortic valve | The valve between the lower left heart chamber and the aorta normally has three flaps. A bicuspid valve has only two. People born with a bicuspid aortic valve are more likely to get a thoracic aneurysm |
Untreated infection | Rare. An untreated infection such as syphilis or salmonella can cause one |
Traumatic injury | Rare. Some people injured in falls or motor vehicle crashes develop them |
What are the risk factors for a thoracic aortic aneurysm?
Anything that damages or weakens blood vessels may raise the risk of an aneurysm.
Risk Factor | Details |
Age | Most often in people age 65 and older |
Smoking and tobacco use | If you smoke or chew tobacco, quitting matters — tobacco use can worsen an aneurysm and overall health |
High blood pressure | Damages the blood vessels in the body |
Coronary artery disease | Reduces blood flow to the heart; often caused by atherosclerosis, which can damage the vessel lining and raise aneurysm risk — a more common risk in older people |
Family history | More likely if a parent, brother, sister, or child has one; you may develop aneurysms at a younger age |
If you're at risk of an aortic aneurysm, you might get medicines to lower your blood pressure and relieve stress on weakened arteries.
What complications can a thoracic aortic aneurysm cause?
Complication | What Happens |
Aortic dissection | A tear in the wall of the aorta causes bleeding into and along the aortic wall. This life-threatening condition needs emergency surgery to prevent death |
Aortic rupture | If a tear causes bleeding outside the aorta. Also life-threatening and needs treatment right away. In general, the larger the aneurysm, the greater the risk of rupture |
Blood clots | Small clots can develop in the aneurysm area. If one breaks loose from the inside wall, it can block a blood vessel elsewhere in the body, possibly causing serious complications |
Stroke | Signs include weakness or inability to move one side of the body and difficulty speaking |
How can a thoracic aortic aneurysm be prevented?
A thoracic aortic aneurysm may be prevented by keeping blood vessels healthy through not smoking, controlling blood pressure and cholesterol, staying active and eating nutritious foods.
Don't smoke or use tobacco
Control blood pressure and cholesterol levels
Keep a healthy weight and stay active
Eat nutritious foods
Screening: Who Should Get Checked?
Screening means having regular imaging tests — usually an echocardiogram — to look for an aneurysm.
Your healthcare professional may suggest screening for a thoracic aneurysm if:
You have a parent, brother, sister, son, or daughter with a genetic condition linked to thoracic aortic aneurysms — an example is Marfan syndrome
You have a family history of aortic aneurysms and wish to get pregnant
If a screening test shows a larger-than-usual aorta or an aneurysm, the test is usually repeated within 6 to 12 months to look for changes.
How Is It Diagnosed?
Thoracic aortic aneurysms often have no symptoms, so they are hard to diagnose — they are often found when an imaging test is done for a different reason. If you have one, your healthcare professional may ask about your family's medical history, because some aneurysms can run in families.
Test | How It Works |
Echocardiogram | Sound waves show how blood moves through the heart and blood vessels, including the aorta. Used to diagnose or screen. A standard echo looks at the aorta from outside the body; if it doesn't give enough detail, a transesophageal echocardiogram looks at the aorta from inside the body |
CT scan | X-rays make cross-sectional images of the body, including the aorta. Shows the size and shape of an aneurysm |
Heart MRI (cardiac MRI) | A magnetic field and radio waves create pictures of the heart and aorta. Shows size and location. No radiation — may be preferred over CT for people who need frequent imaging |
How is a thoracic aortic aneurysm treated?
The goals of treatment are to stop the aneurysm from growing and prevent aortic rupture. Treatment depends on the aneurysm's size and how fast it's growing, and it ranges through regular health checkups (watchful waiting), medicines, and surgery.
Watchful Waiting
Small thoracic aneurysms may only need medicine and regular imaging tests to watch the aneurysm. You'll usually get an echocardiogram, CT, or MR angiography scan at least six months after diagnosis, with the frequency depending on the cause, size, and growth rate.
Medicines
Medicines treat high blood pressure, high cholesterol, and other conditions linked to aneurysms:
Medicine | What It Does |
Beta blockers | Slow the heartbeat and lower blood pressure; may reduce how fast the aorta widens in people with Marfan syndrome |
Angiotensin 2 receptor blockers (ARBs) | Used if beta blockers can't be taken or don't lower blood pressure enough; often recommended for people with Loeys-Dietz syndrome even without high blood pressure. Examples: losartan, valsartan, olmesartan |
Statins | Lower cholesterol and reduce the risk of artery blockages and aneurysm complications. Examples: atorvastatin, lovastatin, simvastatin |
Surgery and Other Procedures
Surgery is generally recommended for thoracic aortic aneurysms about 1.9 to 2.4 inches (5 to 6 centimeters) and larger. Surgery may be recommended for smaller aneurysms if you have a family history of aortic dissection or a condition linked to aortic aneurysm, such as Marfan syndrome. The type of surgery depends on the cause, your overall health, and the location of the aneurysm.
Procedure | What Happens |
Open surgery | Most people have this major surgery: the surgeon removes the part of the aorta damaged by the aneurysm and replaces it with a synthetic tube, called a graft, sewn into place |
Aortic root surgery | Done to prevent rupture: part of the aorta — and sometimes the aortic valve — is removed and replaced with a graft. The valve may be replaced with a mechanical or biological valve. If the valve stays, it's called valve-sparing aortic root repair |
Endovascular aortic aneurysm repair (EVAR) | A less invasive option with small cuts and possibly faster recovery. A catheter is placed into a blood vessel — usually in the groin — and guided to the aorta; a graft on the catheter end goes to the aneurysm site, held by small hooks or pins, strengthening the weakened aorta. EVAR isn't right for everyone, and afterward you need regular imaging to confirm the graft is working |
Emergency surgery | A ruptured thoracic aortic aneurysm needs emergency open-chest surgery — which is risky with a high complication chance. That's why finding and treating aneurysms before they rupture matters so much |
What lifestyle and home management helps with a thoracic aortic aneurysm?
If you have a thoracic aortic aneurysm, your healthcare team may tell you to avoid heavy lifting and some energetic physical activities, because they can raise blood pressure — and high blood pressure puts pressure on the aneurysm. If you want to do a particular activity, talk with your team; you may need an exercise stress test to see how activity affects your blood pressure. Moderate physical activity is generally healthy. Also tell every prescriber you have an aneurysm: the FDA warns that fluoroquinolone antibiotics, such as ciprofloxacin and levofloxacin, can raise the risk of aortic aneurysm rupture or dissection and should be avoided unless no other option exists.
Emotional stress can also raise blood pressure, so managing stress matters — more exercise and practicing mindfulness are two useful tools. And as with all aneurysm conditions, coping and support help: connecting with others who have been through similar situations — such as support groups — can make a real difference.
How should you prepare for a thoracic aortic aneurysm appointment?
If you have a family history of thoracic aortic aneurysms or conditions linked to them, make an appointment for a health checkup. If an aneurysm is found early, treatment may be easier and more effective.
What You Can Do
Ask about preparation — you may need to avoid food or drink before some tests
Write down your symptoms — including any that seem unrelated
Write down important personal information — especially a family history of heart disease, aneurysms, or connective tissue disease
List all medicines, vitamins, and supplements with dosages
Take someone along — it's hard to remember everything said in an appointment
Be ready to discuss your diet, exercise habits, and tobacco use (including whether you've ever smoked)
Send imaging reports in advance and bring your medical records
Write down your questions
Questions to Ask
What tests do I need?
What size is my aneurysm?
What treatments are available, and which do you recommend for me?
What's an appropriate level of physical activity?
Do I need to change my diet?
How often should I be screened for an aneurysm?
Should I tell other family members to be screened?
I have other health conditions — how can I best manage them together?
Is there information I can take home? What websites do you recommend?
Don't hesitate to ask any other questions.
What Your Doctor Will Ask
When did your symptoms start?
Do they come and go, or are they constant?
On a scale of 1 to 10, how bad are they?
Do you have a family history of aneurysms or genetic diseases, such as Marfan syndrome?
Do you smoke, or have you ever smoked?
Have you ever been told you have high blood pressure?
What makes your symptoms better or worse?
In the meantime, healthy lifestyle changes can protect the heart and blood vessels: eat healthy foods, stay active, and don't smoke. Once diagnosed, ask how often you need health checkups.
Frequently Asked Questions
What is a thoracic aortic aneurysm?
A thoracic aortic aneurysm is a weakened, bulging area in the upper part of the aorta — the body's main artery — located in the chest, including near the heart. It is also called a thoracic aneurysm and is less common than an abdominal aortic aneurysm.
What are the symptoms?
Most people have no symptoms, which makes the condition hard to find. As it grows, symptoms may include back pain, cough, a weak or scratchy voice, shortness of breath, and chest tenderness or pain. Some aneurysms never rupture or cause dissection.
How do I know if a thoracic aortic aneurysm has ruptured or dissected?
Emergency signs include sharp, sudden pain in the upper back that spreads down the body, pain in the chest, jaw, neck or arms, trouble breathing, low blood pressure, loss of consciousness, and trouble swallowing. Both rupture and dissection are medical emergencies — call 911 immediately.
What causes a thoracic aortic aneurysm?
Causes include atherosclerosis (fat and cholesterol buildup that stiffens and weakens artery walls), genetic conditions such as Marfan syndrome, Loeys-Dietz syndrome, or vascular Ehlers-Danlos syndrome, blood vessel inflammation (Takayasu arteritis, giant cell arteritis), a bicuspid aortic valve, and rarely an untreated infection or traumatic injury.
When is surgery recommended?
Surgery is generally recommended for aneurysms about 5 to 6 centimeters (1.9–2.4 inches) or larger. It may be recommended earlier for smaller aneurysms if you have a family history of aortic dissection or a linked genetic condition such as Marfan syndrome.
Who should get screened?
Screening — usually with a regular echocardiogram — is suggested if you have a first-degree relative (parent, sibling, or child) with a genetic condition linked to thoracic aortic aneurysms such as Marfan syndrome, or if you have a family history of aortic aneurysms and plan to get pregnant. Abnormal screening results are typically repeated within 6 to 12 months.
What medicines are used?
Beta blockers slow the heartbeat and lower blood pressure and may slow aortic widening in people with Marfan syndrome. ARBs are used if beta blockers aren't tolerated. Statins lower cholesterol and reduce the risk of artery blockages and aneurysm complications.
How is a thoracic aortic aneurysm diagnosed?
It is often found on an imaging test done for another reason. An echocardiogram, CT scan or heart MRI can show the aneurysm's size and location.
Can I exercise with a thoracic aortic aneurysm?
Moderate activity is generally healthy, but your care team may advise avoiding heavy lifting and some strenuous activities because they raise blood pressure. Ask before starting a new activity, since you may need an exercise stress test first.
What is the difference between a thoracic and an abdominal aortic aneurysm?
Both are bulges in the aorta, the body's main artery. A thoracic aneurysm forms in the chest, while an abdominal aneurysm forms in the belly and is more common.
Conclusion
The three lessons to carry away from this guide:
Silent doesn't mean safe: thoracic aortic aneurysms grow slowly and often without symptoms — which is exactly why they're hard to find and why family history matters so much.
The emergency signs are unmistakable: a sharp, sudden upper back pain spreading down the body — with chest, jaw, neck, or arm pain, breathing trouble, or loss of consciousness — means call 911 without hesitation.
Treatment is well mapped: watchful waiting with regular imaging, blood-pressure medicines, and repair options from open surgery with a graft to catheter-based EVAR — with surgery generally recommended at 5 to 6 centimeters, or earlier for high-risk patients.
This guide has walked you through what a thoracic aortic aneurysm is, its growing and emergency symptoms, six causes and five risk factors, four complications, the screening and diagnostic path, and the full treatment landscape from beta blockers to aortic root surgery. If aortic aneurysms run in your family, the single most valuable step is asking about screening before symptoms ever appear.
If you want to understand aneurysms in other parts of the body, explore our complete guides to aortic aneurysm and abdominal aortic aneurysm.
Disclaimer: This article is for general informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional for diagnosis and treatment of any health condition. Never disregard professional medical advice or delay seeking it because of something you have read here.
Related Reading
Echocardiogram: Types, What to Expect, Results and Risks: An echocardiogram is a radiation-free heart ultrasound that can help reveal a thoracic aortic aneurysm.
References
Mayo Clinic Staff. Thoracic aortic aneurysm - Symptoms and causes. Mayo Clinic. April 18, 2025. https://www.mayoclinic.org/diseases-conditions/thoracic-aortic-aneurysm/symptoms-causes/syc-20350188
Mayo Clinic Staff. Thoracic aortic aneurysm - Diagnosis and treatment. Mayo Clinic. April 18, 2025. https://www.mayoclinic.org/diseases-conditions/thoracic-aortic-aneurysm/diagnosis-treatment/drc-20350193
Isselbacher EM, et al. 2022 ACC/AHA Guideline for the Diagnosis and Management of Aortic Disease: A Report of the American Heart Association/American College of Cardiology Joint Committee on Clinical Practice Guidelines. Circulation. 2022;146(24):e334-e482. PMID 36322642. https://doi.org/10.1161/CIR.0000000000001106
Lacro RV, et al. Atenolol versus losartan in children and young adults with Marfan's syndrome. N Engl J Med. 2014;371(22):2061-71. PMID 25405392. https://doi.org/10.1056/NEJMoa1404731
Myasoedova VA, et al. Exploiting the anti-fibrotic effects of statins on thoracic aortic aneurysm progression: results from a meta-analysis and experimental data. Front Pharmacol. 2024;15:1426982. PMID 39148550. https://doi.org/10.3389/fphar.2024.1426982
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