Anyway, I'm not sure what this has to do with the original post.
From Harrison's 17th ed. ch 287: "H. pylori and NSAID-induced injury account for the majority of DUs."
From Malfertheiner's "Peptic Ulcer Disease" (Lancet 2009): "Emotional stress and psychosocial factors are frequently identified as important contributors to ulcer pathogenesis. Although stress cannot be neglected as a contributing factor, convincing evidence for it being the sole cause of duodenal ulcer is scarce. A good example of stress as a contributory factor was the rise in bleeding gastric ulcers in elderly people after a severe earthquake in Japan."
Note that in general, when the medical establishment talks about "stress", its practitioners generally mean physiologic stress states, such as burns, trauma, sepsis, or multiorgan dysfunction. Does physiologic stress cause ulcers? Indeed. Emotional stress? It may contribute, but is not, in itself, an important cause.