Some aortic aneurysms are genetic issues and others I believe can be from lifestyle issues (smoking) or high blood pressure. From my understanding, the 4.1 cm measurement is not terribly large. I think the important thing right now is to monitor how fast it is growing, if at all. Mine has been about that size for a number of years and appears to be growing very, very slowly. I believe surgical intervention is considered when the aneurysm grows somewhere in the 5 cm range. In the meantime, I am sure your cardiologist has recommended not lifting over a certain weight -- for me, no lifting over 25 lbs. Also, absolutely no snow shoveling no matter how light the snow.

At this point, I don't think you should be losing sleep over this issue but rather, assure you are being monitored, that you are following your cardio's lifestyle advice and hold off the worrying until you see how fast the aneurysm is growing. In my case, I hope to die of old age before needing surgery to repair the aneurysm.