Oddly, this isn't the first time I've seen someone wonder if a AAA causes an upper GI bleed. Perhaps a confusion of "all tubes in the neck are the same" and Mallory Weiss tear instead of thoracic aortic aneurysm dissection? It seems to indicate confusion on several different levels.
Well, a AAA can cause an aortoenteric fistula, which can cause some pretty massive bleeding into the GI tract. Usually occurs in patients that have had their AAA repaired.