Thumb Test Hints at Aortic Risk, But Isn’t Diagnostic

The thumb-palm test, where the thumb crosses beyond the edge of the palm, may reflect joint laxity linked to connective-tissue disorders such as Marfan or Ehlers-Danlos and could hint at higher aortic aneurysm risk, but it is not a reliable screening tool and should not replace medical imaging. If you have a positive result or risk factors, discuss with a doctor about appropriate testing (echocardiography, CT or ultrasound) and guideline-based surveillance.