A diagonal crease across your earlobe is called Frank’s sign, and it has been linked to an increased risk of heart disease. Named after pulmonologist Sanders T. Frank, who first described it in 1973, the crease runs diagonally from the small cartilage flap near your ear canal (the tragus) to the outer edge of your earlobe. While it’s not a reliable diagnostic tool on its own, it can be a visual clue worth paying attention to, especially if you have other cardiovascular risk factors.
What Frank’s Sign Looks Like
Frank’s sign is a permanent, visible fold in the skin of the earlobe that runs at a diagonal angle. It can appear on one ear or both, and it varies in depth from a faint line to a deep, well-defined crease. A grading system ranks its severity based on four features: length, depth, whether it appears on one or both sides, and its angle of inclination.
- Unilateral incomplete: a partial crease on one ear, considered the least significant
- Unilateral complete: a full crease running the length of one earlobe
- Bilateral complete: a full crease on both earlobes, considered the most significant
This is different from the temporary lines you might notice after sleeping on one side. Sleep creases are shallow, appear in various directions, and fade within hours. Frank’s sign is permanent, consistently diagonal, and deepens over time.
Why the Earlobe Shows Damage First
The earlobe forms relatively late during fetal development, at a point where two tissue areas fuse together. This fusion site has fewer blood vessels than most of the body’s surface, which means it naturally receives less oxygen. That makes it one of the first places to show visible signs when blood flow is compromised.
In people with heart disease or heart failure, the body cycles through periods of reduced oxygen delivery and then re-oxygenation, particularly during physical stress. Over time, these repeated cycles damage the tiny blood vessels in the earlobe and degrade the surrounding nerve fibers. The tissue gradually stiffens and scars, eventually forming the visible crease. This is the same kind of low-grade, chronic damage happening inside blood vessels elsewhere in the body. The earlobe just shows it on the surface before other areas do.
The Link to Heart Disease
Dozens of studies have examined the relationship between a diagonal earlobe crease and coronary artery disease. The association is real but imperfect. A systematic review of diagnostic accuracy studies found that sensitivity ranged from 26% to 90%, and specificity from 32% to 96%. In practical terms, this means the crease sometimes appears in people without heart disease, and sometimes it’s absent in people who do have it.
Most of the statistical measures in that review showed the crease only slightly shifts the probability of heart disease in either direction. Its presence alone isn’t enough to diagnose anything, and its absence doesn’t rule anything out. The review’s conclusion was straightforward: the diagnostic accuracy is insufficient to change clinical decisions by itself, but the crease is easy to spot and could reasonably be noted during a physical exam.
Beyond the Heart: Other Associations
The earlobe crease isn’t limited to coronary artery disease. Studies using ultrasound imaging have linked it to plaque buildup in the carotid arteries, the major vessels supplying blood to the brain. That connection raises the possibility that Frank’s sign may also relate to stroke risk, though the evidence is less developed than the heart disease data.
A cross-sectional study of Korean adults found the crease in about 21% of participants. After adjusting for conventional cardiovascular risk factors like age, blood pressure, and cholesterol, the presence of the crease was still independently associated with a higher odds of metabolic syndrome, a cluster of conditions including high blood sugar, excess abdominal fat, and abnormal cholesterol levels. The researchers couldn’t determine whether insulin resistance was the connecting thread, since they didn’t measure it directly, but the pattern suggests the crease may reflect broader metabolic stress rather than heart disease alone.
Age and Other Explanations
One of the biggest challenges in interpreting an earlobe crease is separating it from normal aging. Skin loses elasticity over time, and earlobes naturally become thinner and more wrinkled with age. Many of the same risk factors for heart disease, like high blood pressure and high cholesterol, also become more common as people get older. This overlap makes it difficult to know whether the crease is a genuine marker of cardiovascular damage or simply something that tends to show up alongside it because both are more prevalent in older adults.
Some people are also born with earlobe creases or develop them at a young age without any health concerns. Genetics, ear shape, and the way cartilage and tissue are distributed all play a role. A crease in a 30-year-old with no other risk factors carries a very different meaning than a deep bilateral crease in a 60-year-old with high blood pressure and a family history of heart attacks.
What To Do If You Notice a Crease
If you’ve spotted a diagonal crease on one or both earlobes, it doesn’t mean you have heart disease. But it’s a reasonable prompt to check in on your cardiovascular health, particularly if you haven’t had recent screening or if you carry other risk factors like smoking, high blood pressure, elevated cholesterol, diabetes, or a family history of heart disease.
The typical next step is standard cardiovascular screening: blood pressure measurement, cholesterol and blood sugar testing, and possibly an assessment of your overall risk using a scoring tool your doctor already has. In some cases, particularly when the crease appears alongside multiple risk factors, imaging of the carotid arteries or further cardiac evaluation may be appropriate. The crease itself doesn’t require treatment. It’s the underlying conditions it may point to that matter.