The thumb test is a simple self-check that may reveal an increased risk for aortic aneurysms by assessing joint laxity. Dr. Tracy Paeschke explains that if the thumb extends beyond the palm, it could indicate conditions like Marfan syndrome or Ehlers-Danlos syndrome, which are associated with weakened blood vessel walls. However, cardiologists caution that this test is not diagnostic; many individuals with aortic aneurysms may not exhibit a positive thumb test. Dr. Marc Bonaca and Dr. Tarak Rambhatla emphasize that the thumb test should not replace formal medical evaluations or imaging, as it could lead to false reassurance or unnecessary anxiety. If someone has a positive result, consulting a physician for further evaluation and possible imaging is recommended. Other risk factors for aortic aneurysms include age, gender, smoking, and family history. Awareness of the thumb test can lead to important health discussions, but medical decisions should rely on evidence-based practices and imaging.