How Common Is Frank’s Sign and What Does It Mean?

Frank’s sign, the diagonal crease that runs from the tragus toward the outer edge of the earlobe, appears in roughly 15 percent of healthy young adults and becomes far more common with age, showing up in nearly half of older populations. Named after the pulmonologist Sanders T. Frank, who first described it in 1973, the crease has been linked to coronary artery disease, stroke, and other vascular conditions across dozens of studies spanning five decades. Whether it is a genuinely useful clinical marker or simply a wrinkle that happens to track with aging remains a surprisingly contested question in medicine.

How Many People Have It

Prevalence figures for Frank’s sign vary enormously depending on who is being studied and how old they are. In a study of 853 healthy young individuals, the crease was absent in about 85 percent and present in roughly 15 percent. Men were more likely to have it than women: about 17 percent of men versus 12 percent of women showed the crease, a difference that was statistically meaningful.¹ In an older, community-dwelling population, the numbers shift dramatically: the earlobe crease was identified in 48 percent of participants.² That jump tells you something important: age is the single biggest driver of how common the sign is. The older you are, the more likely you are to have it, which is part of what makes it so tricky to interpret.

Among the young people who did have the crease, most had a mild version. Grade 1, a faint or partial line, accounted for the vast majority of cases, while deeper or more pronounced creases (grade 2 and grade 3) were rare, appearing in just a small fraction of participants.¹ This distinction matters because deeper creases appear to carry more clinical weight, a point that comes up repeatedly across the research.

Not All Creases Are Equal

There is no single universal grading system, but most researchers classify the crease by depth and length. A shallow, incomplete line that only partially crosses the lobe sits at the mild end. A deep crease that runs the full diagonal from the ear canal opening to the lobe’s outer rim, especially one visible on both ears, is considered the most pronounced form. Some grading scales also account for secondary creases or branching patterns.

The grade matters clinically. A forensic pathology study found that the severity of the crease correlated with the severity of coronary artery disease and with the degree of general atherosclerosis (the buildup of fatty deposits in arteries throughout the body), both with meaningful effect sizes.³ Similarly, individuals with higher crease scores, reflecting longer and deeper creases, consistently fell into higher cardiovascular risk categories when assessed using standard risk calculators.⁴ In practical terms, a faint line on one earlobe of a 25-year-old is a very different finding than a deep bilateral crease on a 60-year-old with high blood pressure.

The Link to Coronary Artery Disease

The association between Frank’s sign and coronary artery disease is the most studied connection, and the overall pattern is consistent: people with the crease are more likely to have blocked coronary arteries than people without it. A review of 57 studies spanning different populations worldwide confirmed this association, and autopsy studies found a strong link between the sign and cardiovascular causes of death including ischemic heart disease, calcified valve disease, and ruptured aortic aneurysm.⁵

In patients showing up with their first acute coronary syndrome (a heart attack or unstable angina), the presence and number of earlobe creases independently predicted how extensive the coronary blockages were. More creases pointed to more severe disease.⁶ And in an autopsy-based study, Frank’s sign was present in about 64 percent of cardiovascular deaths compared to about 36 percent of non-cardiovascular deaths. After adjusting for age, sex, and ethnicity, the crease was associated with roughly eight times the odds of a cardiovascular cause of death.⁷

But association is not the same as diagnostic accuracy, and this is where the picture gets muddier.

How Good Is It as a Diagnostic Tool

If you are wondering whether a doctor could look at your earlobes and tell you whether you have heart disease, the honest answer is: not reliably. A systematic review of diagnostic accuracy studies found that the sensitivity of Frank’s sign for detecting coronary artery disease ranged from 26 percent to 90 percent, and specificity ranged from 32 percent to 96 percent. That is an enormous spread. Most of the positive likelihood ratios fell below 2, which means the crease barely shifted the probability of disease in any individual patient. The review’s overall conclusion was blunt: the diagnostic accuracy of Frank’s sign for detecting chronic coronary disease is insufficient.⁸

Individual studies paint slightly different pictures depending on the population and the method. One forensic pathology study focused on fatal coronary disease and found the sign had high specificity (about 86 percent) and a reasonable negative predictive value (about 85 percent), meaning that if you did not have the crease, you were unlikely to have died from coronary disease. But sensitivity was only about 61 percent, meaning it missed roughly four in ten cases. The overall discriminative power was graded as only “fair.”⁹ Another study using CT coronary angiography found the opposite pattern: high sensitivity (88 percent) but low specificity (50 percent), meaning it caught most cases but also flagged many people who did not actually have significant blockages.¹⁰

The inconsistency across studies probably reflects differences in the populations studied, how the crease was defined and graded, and which severity of coronary disease counted as a positive result. What all these numbers tell you collectively is that Frank’s sign can add a small piece of information to the clinical picture, but it cannot replace any standard diagnostic test. No cardiologist is going to order or cancel an angiogram based on your earlobes alone.

What Is Happening Inside the Earlobe

The crease is not just a surface wrinkle. Tissue samples taken from creased earlobes show distinctive changes at the microscopic level: thickening and scarring of the walls of small arteries (a process called myoelastofibrosis), widespread fibrosis in the deeper tissue, and degeneration of peripheral nerves with characteristic eosinophilic inclusions. These changes were found concentrated at the base of the crease and appeared to progress over time.¹¹ The same study found a significant correlation between these earlobe changes and changes in the heart muscle itself, suggesting that whatever process damages the small vessels in the earlobe may be happening simultaneously in the coronary arteries.

This makes biological sense. The earlobe is supplied by tiny end-arteries with no backup circulation. If a systemic process like atherosclerosis is affecting small vessels throughout the body, the earlobe might show visible damage earlier or more obviously than other areas simply because it has no collateral blood supply to compensate. The crease, in this model, is essentially a scar formed when the tissue loses its blood supply and collapses inward.

Risk Factors That Travel With the Crease

Frank’s sign does not appear in a vacuum. People who have it tend to carry a cluster of conventional cardiovascular risk factors. A large study in Mexican adults found that being male, being over 55, being obese, having high blood pressure, and having experienced an acute coronary syndrome were all independently associated with having the crease. Interestingly, smoking, diabetes, and abnormal cholesterol levels were significant in initial analysis but dropped out once those other factors were accounted for, suggesting the crease tracks most strongly with age, sex, obesity, and hypertension.¹²

Even among young, apparently healthy people, having the crease was linked to a family history of chronic disease. About two-thirds of the young people with Frank’s sign had at least one family member with a chronic condition, compared to a lower proportion among those without the crease. That relationship was statistically significant.¹ This finding raises the possibility that genetics plays a role: the crease may be a visible marker of inherited vascular vulnerability rather than just accumulated damage.

Beyond the Heart

The association extends beyond coronary arteries. Frank’s sign has been linked to ischemic stroke through what appears to be the same underlying atherosclerotic mechanism that connects it to heart disease. A review of the literature concluded that the crease increases the risk of cerebrovascular events, particularly ischemic stroke.¹³ A separate study found a significant association between the crease and ischemic stroke even after excluding patients who already had known cardiovascular disease, suggesting the link is not just because the same patients have both conditions.¹⁴

Peripheral vascular disease also appears in the picture. In the population-based study that found the crease in 48 percent of participants, about 19 percent had abnormal ankle-brachial index readings, a standard measure of blood flow problems in the legs. The relationship between the crease and abnormal blood flow was again tied to age.²

What Happens After a Heart Attack

For people who have already had a heart attack, the crease appears to carry prognostic weight. A study tracking patients after acute myocardial infarction found that those with deep creases (grade 2 or 3) had roughly twice the risk of dying over a three-year follow-up compared to those with no or mild creases. The effect was even more pronounced in the first year: patients with deep creases had about 3.5 times the risk of death in the unadjusted analysis, and even after controlling for other risk factors, the risk remained roughly 2.5 times higher.¹⁵ Other factors that independently predicted worse outcomes in the same study included older age, reduced heart pumping function, peripheral artery disease, and higher levels of inflammation markers.

These findings suggest the crease may flag people whose vascular disease is more advanced or more aggressive. For a cardiologist managing someone after a heart attack, noticing the crease would not change the treatment plan in isolation, but it might add to the overall assessment of risk.

The Crease and the Aging Brain

One of the more intriguing research threads involves the connection between Frank’s sign and brain health. A study examining cognitively impaired patients found they were more likely to have the crease than cognitively normal individuals. The association was strongest in patients with subcortical vascular cognitive impairment, a form of mental decline driven by damage to small blood vessels in the brain. Patients who had both significant white matter damage (a marker of small vessel disease) and brain amyloid deposits were more than seven times as likely to have the crease compared to those with minimal disease.¹⁶

However, the picture is not straightforward. A separate study from the Atahualpa Project in Ecuador found no relationship between the crease and cognitive performance as measured by a standard screening test, once age and other factors were accounted for.¹⁷ The discrepancy likely reflects differences in the study populations and the type of cognitive impairment being measured. The crease may specifically track with vascular forms of brain damage rather than cognitive aging in general. This distinction is clinically meaningful because vascular cognitive impairment is potentially preventable through blood pressure control and other cardiovascular risk management.

Biological Aging and Telomere Length

A small pilot study offered a tantalizing biological mechanism for why the crease might matter. In male patients with metabolic syndrome, those who had the earlobe crease had shorter telomeres, the protective caps on the ends of chromosomes that shorten as cells divide and age. The crease group’s telomeres were measurably shorter than those of age-matched and risk-factor-matched patients without the crease. In the same study, the crease was also far more common in patients who had established atherosclerotic vascular disease (about 72 percent) compared to those who did not (about 25 percent).¹⁸

If the crease really does reflect accelerated biological aging at the cellular level, it would explain a lot: why it correlates with so many different vascular diseases (they all share aging as a risk factor), why it becomes more common with chronological age, and why deeper creases seem to carry worse prognoses. This is still preliminary evidence from a small study, though, and the finding needs replication in larger and more diverse groups before it can be considered established.

Why the Controversy Persists

For a physical sign first described more than fifty years ago and studied in dozens of papers, Frank’s sign remains remarkably controversial. The core debate boils down to whether the crease adds any information beyond what you would already know from a patient’s age and standard risk factors. Several competing hypotheses were laid out early in the research: the crease could be a genuine coronary risk marker, a genetic indicator of vascular vulnerability, a coincidental byproduct of aging, or even an anatomical feature shaped by sleeping position.¹⁹ The truth likely involves elements of more than one of these explanations.

The strongest argument against relying on the sign clinically is age confounding. Both the crease and cardiovascular disease become much more common as people get older. If you account fully for age, some of the association weakens. The fully adjusted survival analysis after heart attack, for instance, showed the crease’s independent effect on three-year mortality became borderline non-significant once other risk factors were controlled for, though it remained significant during the first year.¹⁵ On the other hand, the autopsy study that controlled for age, sex, and ethnicity still found the crease to be a powerful independent predictor of cardiovascular death, with about eight times the adjusted odds.⁷

The clinical reality is that no one is proposing Frank’s sign as a standalone screening test. The diagnostic accuracy is too inconsistent for that. But as something a doctor can notice during a routine physical exam, without any equipment, cost, or time, it has a certain practical appeal. Some researchers have argued that noticing the crease should prompt clinicians to take a closer look at a patient’s cardiovascular risk profile, especially in younger patients where the sign might flag hidden risk before symptoms develop.²⁰

What to Do If You Have the Crease

If you have noticed a diagonal line across one or both of your earlobes, there is no reason to panic, but it is worth paying attention to. The crease on its own does not mean you have heart disease. Many people with the sign have perfectly healthy arteries, and many people without it develop cardiovascular problems. What the research collectively suggests is that the crease nudges your statistical risk profile slightly upward, particularly if it is deep, runs across both ears, and you are younger than 55 (where the crease is less expected and therefore potentially more meaningful).

The practical response is the same advice that applies to anyone with elevated cardiovascular risk: know your blood pressure, cholesterol, and blood sugar numbers. Stay physically active. Maintain a healthy weight. If you smoke, quit. The crease does not change any of these recommendations, but for some people, seeing a visible mark on their body can be a stronger motivator than hearing a number at a doctor’s visit. In that sense, Frank’s sign has value even if it never makes it into formal clinical guidelines: it is one of the few cardiovascular risk signals you can literally see in the mirror.

1
PubMed Central. Prevalence of Frank’s sign in healthy young individuals, morphological characteristics, and its association with family history of chronic disease
2
International Journal of Vascular Medicine. The Association between Earlobe Crease (Frank’s Sign) and Abnormal Ankle-Brachial Index Determination Is Related to Age: A Population-Based Study
3
PubMed Central. The prognostic value of the Frank sign
4
The American Journal of Medicine. How Common Is Frank’s Sign and What Does It Mean?
5
PubMed. Association Between the Frank Sign and Cardiovascular Events
6
Turkish Journal of Clinics and Laboratory. Frank sign may predict more advanced coronary artery disease in patients admitted with a first time acute coronary syndrome
7
PubMed Central. Relationship Between Frank’s Sign and Cardiovascular Disease: An Autopsy-Based Study
8
PubMed Central. Diagonal Earlobe Crease (Frank’s Sign) for Diagnosis of Coronary Artery Disease: A Systematic Review of Diagnostic Test Accuracy Studies
9
PubMed. Ear-ly Warnings: The diagnostic accuracy of Frank’s sign in fatal coronary artery disease – A forensic pathology study
10
Italian Journal of Medicine. Predictive value of Frank’s sign for obstructive coronary artery disease confirmed by coronary computed tomography angiography
11
PubMed Central. The Histological Basis of Frank’s Sign
12
International Journal of Hypertension. Traditional Cardiovascular Risk Factors Associated with Diagonal Earlobe Crease (Frank Sign) in Mexican Adults: Aging, Obesity, Arterial Hypertension, and Being Male Are the Most Important
13
PubMed. Diagonal earlobe crease (Frank’s sign) and increased risk of cerebrovascular diseases: review of the literature and implications for clinical practice
14
PubMed Central. Frank’s Sign: A Clinical Predictor of Ischaemic Strokes
15
PubMed Central. Diagonal earlobe crease and long-term survival after myocardial infarction
16
PubMed Central. Diagonal Earlobe Crease is a Visible Sign for Cerebral Small Vessel Disease and Amyloid-β
17
PubMed. The association between earlobe crease (Frank’s sign) and cognitive performance is related to age. Results from the Atahualpa Project
18
Circulation Journal. Diagonal Earlobe Crease are Associated With Shorter Telomere in Male Japanese Patients With Metabolic Syndrome A Pilot Study
19
PubMed Central. Diagonal earlobe crease: a coronary risk factor, a genetic marker of coronary heart disease, or a mere wrinkle. Ancient Greco-Roman evidence
20
PubMed Central. Warning Function of Frank’s Sign in Pre-Existing Cardiac Disease Patients: A Case Report