That's not quite true. 50% of the world's population are infected with H. Pylori, so clearly it isn't the only cause. It is still thought that stress is a major

That's not quite true. 50% of the world's population are infected with H. Pylori, so clearly it isn't the only cause. It is still thought that stress is a major factor in causing peptic ulcer [1]. We know for sure that stress causes increased stomach acid secretion, changes to immunity in the gut, as well as changes to the musocal lining. Any one of these factors could increase the risk of getting a stomach ulcer. [1] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2665639/pdf/9501720.pdf https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2665639/pdf/950...