An estimated 6.8 million Americans — about 1 in 50 people — are living with an unruptured brain aneurysm, while abdominal aortic aneurysms caused 23,260 deaths in the US between 2018 and 2024. Roughly 30,000 brain aneurysm ruptures occur in the US each year, one every 18 minutes, and a ruptured aneurysm remains fatal in about half of all cases.
Aneurysm in America 2026
Aneurysm in the US cover two very different conditions that share a name and a basic mechanism: a weakened section of blood vessel wall balloons outward under normal blood pressure, and eventually may rupture. Brain (cerebral) aneurysms form in the arteries feeding the brain, while abdominal aortic aneurysms (AAA) form in the body’s largest blood vessel as it passes through the abdomen. Both are largely silent conditions — the vast majority of people carrying one never know it until imaging catches it by chance or until it ruptures — which is exactly what makes population-level statistics so important for understanding who is actually at risk.
The 2026 picture is shaped by two competing trends. On one hand, declining smoking rates have measurably reduced AAA prevalence and mortality over the past two decades, a genuine public health success story. On the other hand, an aging population and the wider use of CT and MRI imaging for unrelated reasons mean more aneurysms of both types are being incidentally discovered than ever before, which raises new questions about surveillance, unnecessary anxiety, and when intervention is actually warranted. The sections below lay out the current US numbers for both conditions, drawing on CDC mortality data, the Brain Aneurysm Foundation, and the US Preventive Services Task Force screening guidelines.
Interesting Facts about Aneurysm in the US 2026
| Category | Figure |
|---|---|
| Americans with an unruptured brain aneurysm | 6.8 million (1 in 50 people) |
| Brain aneurysm ruptures per year in the US | ~30,000 |
| Frequency of brain aneurysm rupture | One every 18 minutes |
| Fatality rate of a ruptured brain aneurysm | ~50% |
| AAA-related deaths, US, 2018-2024 | 23,260 |
| Aortic aneurysm/dissection deaths, 2019 | 9,904 (59% among men) |
| Share of AAA cases linked to smoking history | ~75% |
| Death risk if an AAA ruptures | As high as 81% |
| USPSTF one-time AAA screening group | Men aged 65-75 who have ever smoked (Grade B) |
The most striking thing about these two conditions side by side is the gap between how common they are and how rarely they’re diagnosed before something goes wrong. 6.8 million people carrying a brain aneurysm dwarfs the roughly 30,000 who experience a rupture in a given year, meaning the overwhelming majority of aneurysms never rupture at all — but there is currently no population-wide screening program to identify the ones that eventually will. AAA follows a similar pattern: it is often completely asymptomatic until it either reaches a size requiring elective surgery or ruptures, at which point the associated death risk jumps as high as 81%.
The demographic split between the two conditions is also worth noting upfront. Brain aneurysms are more common in women, at roughly a 3:2 ratio, and typically develop between ages 35 and 60. AAA runs the opposite way: it is substantially more common in men, more common among white Americans than Black Americans, and overwhelmingly concentrated in people over 65 with a smoking history. That divergence is why the two conditions carry entirely separate screening guidelines in the US, covered in detail further down this report.
Brain Aneurysm Prevalence in the US in 2026
US POP - UNRUPTURED BRAIN ANEURYSM █████████████████ 6.8 million (1 in 50)
ANNUAL RUPTURES ██ ~30,000| Metric | Figure |
|---|---|
| Americans with an unruptured brain aneurysm | 6.8 million (1 in 50) |
| Annual rupture rate | 8-10 per 100,000 people |
| Ruptures per year in the US | ~30,000 |
| Time between ruptures nationally | Every 18 minutes |
| Worldwide deaths from brain aneurysms annually | ~500,000 (half under age 50) |
| People with more than one aneurysm | 20% of those diagnosed |
Data Source: Brain Aneurysm Foundation
Brain aneurysms are far more prevalent in the general population than most people realize, with the 6.8 million Americans carrying one representing roughly 2% of the entire US population. Most of these remain small and stable for a person’s entire life, which is why the annual rupture rate sits at a comparatively modest 8 to 10 per 100,000 people. That rate still translates into approximately 30,000 ruptures every year nationally — one occurring, on average, roughly every 18 minutes somewhere in the country.
Globally, brain aneurysm ruptures claim close to 500,000 lives annually, and notably, half of those victims are under the age of 50, making this one of the relatively few major cerebrovascular events that disproportionately affects people in the middle of their working and family lives rather than concentrating almost entirely in old age. About 20% of people diagnosed with a brain aneurysm are found to have more than one, a detail that shapes how neurologists approach imaging follow-up once a first aneurysm is discovered, since the presence of one raises the likelihood that a careful scan will find a second.
Abdominal Aortic Aneurysm Deaths and Prevalence in 2026
| Metric | Figure |
|---|---|
| AAA-related deaths, US, 2018-2024 | 23,260 (crude rate: 1 per 100,000) |
| Aortic aneurysm/dissection deaths, 2019 | 9,904 |
| Share of 2019 deaths among men | ~59% |
| Historical AAA prevalence, general population 60-65+ | 1.6%-7.2% (varies by study) |
| AAA prevalence in a large US nonprofit screening cohort | 2.82% overall; 2.98% ages 65-75 |
| Risk of death if an AAA ruptures | Up to 81% |
Data Source: CDC, UpToDate epidemiological review, Journal of Vascular Surgery
Abdominal aortic aneurysms remain a meaningful cause of cardiovascular mortality in the US even as overall rates have trended downward. Recent CDC-sourced data covering 2018 through 2024 attributes 23,260 deaths to AAA-related complications, a crude national rate of about 1 death per 100,000 people. An earlier CDC snapshot from 2019 put total aortic aneurysm and dissection deaths — a category that includes both abdominal and thoracic aneurysms — at 9,904, with close to 59% of those deaths occurring in men, consistent with the condition’s well-documented male predominance.
Large-scale US screening data tells a somewhat more encouraging story on prevalence. A nationwide nonprofit screening program running from 2001 to 2017, which screened participants regardless of their individual risk profile, found an overall AAA prevalence of 2.82%, rising to 2.98% among people aged 65 to 75 — figures well below the 1.6% to 7.2% range reported in older population studies, a decline researchers largely attribute to falling smoking rates over the past several decades. Even with that improvement, the stakes of a missed or untreated AAA remain severe: once an aneurysm actually ruptures, the associated risk of death runs as high as 81%, which is precisely why the screening guidelines covered later in this report exist in the first place. You can see how AAA and stroke risk intersect with broader US cardiovascular mortality trends in our Stroke Statistics in the US report.
Types of Aneurysms Affecting Americans in 2026
CEREBRAL ANEURYSM FREQUENCY RANGE IN GENERAL POPULATION
████████████████████████████ 0.2% – 9.9% (varies by imaging study)
| Type | Description | Key 2026 Data Point |
|---|---|---|
| Cerebral (brain) aneurysm | Weak spot in an artery feeding the brain | 6.8 million Americans affected; frequency range 0.2%-9.9% across studies |
| Abdominal aortic aneurysm (AAA) | Enlargement of the aorta below the chest, more common than thoracic | 2.82%-2.98% prevalence in screened US cohorts |
| Thoracic aortic aneurysm | Occurs in the chest portion of the aorta | Less common than AAA; distinct risk factors, often genetic/connective tissue-related |
| Giant aneurysm (either type) | Larger than roughly one inch in diameter | Higher rupture risk and greater treatment difficulty |
Data Source: NCBI Bookshelf, CDC, Brain Aneurysm Foundation
Cerebral aneurysms and aortic aneurysms are clinically distinct conditions that happen to share terminology, and the range of frequency estimates for brain aneurysms specifically — anywhere from 0.2% to 9.9% of the general adult population depending on the imaging study — reflects real methodological differences rather than genuine uncertainty about the underlying biology. Researchers estimate this range implies somewhere between 10 and 15 million people in the United States carry a cerebral aneurysm at any given time, a wider estimate than the Brain Aneurysm Foundation’s more commonly cited 6.8 million figure, illustrating how much detection technique and study population affect the count.
On the aortic side, abdominal aortic aneurysms are considerably more common than thoracic ones, occurring below the chest rather than within it and typically driven by atherosclerosis rather than the connective-tissue disorders more often implicated in thoracic cases. Aneurysms of either type that grow beyond roughly one inch in diameter are classified as “giant” aneurysms, a category associated with meaningfully higher rupture risk and greater technical difficulty during surgical or endovascular treatment, regardless of whether the aneurysm sits in the brain or the aorta. For context on how these vascular events compare with other leading killers nationally, see our Leading Causes of Death Statistics in US report.
Age, Sex, and Demographic Risk Factors in 2026
BRAIN ANEURYSM RUPTURE RISK: RACIAL DISPARITY
CAUCASIAN █████████████ Baseline
AFRICAN-AMERICAN / HISPANIC ██████████████████████████ ~2x baseline
| Factor | Brain Aneurysm | Abdominal Aortic Aneurysm |
|---|---|---|
| Sex more affected | Women (3:2 ratio) | Men (substantially higher prevalence) |
| Peak age range for development | 35-60 years; most after age 40 | 65 and older |
| Elevated rupture-risk group | Women over 55 (~1.5x male risk) | Men who have ever smoked, aged 65-75 |
| Racial/ethnic disparity | African-Americans and Hispanics ~2x rupture risk vs. Caucasians | More common in White than Black Americans |
Data Source: Brain Aneurysm Foundation, CDC
The demographic profiles of these two conditions diverge sharply enough that they function almost as mirror images of one another. Brain aneurysms develop most often between ages 35 and 60, skew toward women at roughly a 3:2 ratio, and carry a notably elevated rupture risk for women over 55, who face about 1.5 times the rupture risk of men in the same age range. Racial disparities are also stark on the brain aneurysm side: African-American and Hispanic patients are roughly twice as likely to experience a rupture compared with Caucasian patients, a gap that reflects a combination of biological, socioeconomic, and healthcare-access factors that researchers are still working to fully untangle.
AAA runs almost entirely the opposite direction demographically. It is concentrated heavily in people 65 and older, is substantially more common in men, and — per CDC data — occurs more often among White Americans than Black Americans, the reverse of the brain aneurysm pattern. The single strongest individual risk factor for AAA by a wide margin is smoking history: roughly 75% of all AAA cases are linked to a history of smoking, which is precisely why current US screening guidelines target older men who have ever smoked rather than the general population.
Risk Factors and Screening Guidelines in 2026
USPSTF AAA SCREENING RECOMMENDATIONS BY GROUP (2026)
MEN 65-75, EVER SMOKED ████████████████████████████████ Grade B (screen)
MEN 65-75, NEVER SMOKED ████████████████████ Grade C (selective)
WOMEN, NEVER SMOKED ████ Grade D (against routine)
WOMEN, SMOKED/FAMILY HISTORY ██████ Grade I (insufficient evidence)
| Group | USPSTF Recommendation | Grade |
|---|---|---|
| Men aged 65-75 who have ever smoked | One-time ultrasound screening recommended | B |
| Men aged 65-75 who have never smoked | Selectively offer screening, clinician judgment | C |
| Women who have never smoked | Routine screening not recommended | D |
| Women who have smoked or have family history | Evidence currently insufficient | I |
| AAA surgical repair threshold, men | 5.5 cm diameter, or growth over 1.0 cm/year past 4.0 cm | — |
| AAA surgical repair threshold, women | 5.0-5.4 cm diameter | — |
Data Source: US Preventive Services Task Force
The US Preventive Services Task Force guideline on AAA screening remains the defining framework shaping who actually gets checked in 2026. It recommends a one-time abdominal ultrasound — a Grade B recommendation, meaning moderate-to-high certainty of net benefit — for men aged 65 to 75 who have ever smoked, the single highest-yield group given how strongly smoking drives AAA formation and growth. For men in the same age range who have never smoked, the guidance shifts to a Grade C “selective” recommendation, leaving the decision to clinical judgment and patient preference rather than a blanket screening call, since the overall population benefit for that lower-risk group is small.
Women fall into a notably different guidance track: routine screening is explicitly not recommended for women who have never smoked (Grade D), while the evidence is still considered insufficient (Grade I) to issue a for-or-against recommendation for women who have smoked or who have a first-degree relative with AAA — family history alone roughly doubles a person’s baseline risk of developing the condition. Once an AAA is identified, surgical repair thresholds differ by sex as well: 5.5 cm in men, and a somewhat lower 5.0 to 5.4 cm threshold in women, reflecting research showing women tend to face elevated rupture risk at smaller aneurysm diameters than men. For a broader look at how modifiable cardiovascular risk factors like smoking and hypertension shape mortality risk nationally, our Heart Disease Mortality Statistics in US report covers the underlying data in more depth.
Frequently Asked Questions about Aneurysm in the US 2026
How many people in the US have a brain aneurysm?
An estimated 6.8 million people in the United States — about 1 in 50 — have an unruptured brain aneurysm, according to the Brain Aneurysm Foundation. Most never rupture and many are never diagnosed.
How many people die from aneurysms each year in the US?
Abdominal aortic aneurysm complications caused 23,260 deaths in the US between 2018 and 2024. A separate CDC snapshot for 2019 put total aortic aneurysm and dissection deaths at 9,904 for that single year. Brain aneurysm ruptures cause roughly 500,000 deaths worldwide annually, with the US contributing a significant share given about 30,000 US ruptures occur each year and roughly half are fatal.
Who should get screened for an abdominal aortic aneurysm?
The USPSTF recommends a one-time ultrasound screening for men aged 65 to 75 who have ever smoked, its strongest (Grade B) recommendation. Men in that age range who never smoked should be screened selectively based on clinical judgment, while routine screening is not recommended for women who have never smoked.
What percentage of AAA cases are linked to smoking?
Roughly 75% of all abdominal aortic aneurysm cases are linked to a history of smoking, making it by far the single strongest modifiable risk factor for the condition.
Are brain aneurysms more common in men or women?
Women are more likely than men to have a brain aneurysm, at roughly a 3:2 ratio, and women over 55 face about 1.5 times the rupture risk that men in the same age group face.
What is the survival rate if a brain aneurysm ruptures?
A ruptured brain aneurysm is fatal in about 50% of cases. Of those who survive, roughly 66% experience some degree of permanent neurological deficit, and about 15% of people die before they even reach the hospital.
How is an abdominal aortic aneurysm diagnosed?
AAA is typically diagnosed via abdominal ultrasound, the standard screening method, or incidentally found on CT or MRI scans performed for unrelated reasons. A diameter greater than 3 cm is generally classified as an aneurysm.
What size aneurysm requires surgery?
For abdominal aortic aneurysms, surgical repair is generally recommended once the aneurysm reaches 5.5 cm in men or 5.0 to 5.4 cm in women, or when it grows faster than 1.0 cm per year after exceeding 4.0 cm.
Disclaimer: The data research report we present here is based on information found from various sources. We are not liable for any financial loss, errors, or damages of any kind that may result from the use of the information herein. We acknowledge that though we try to report accurately, we cannot verify the absolute facts of everything that has been represented.
