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They are caused by bacterial infection and not stress or capsaicin, so I sure hope he could claim an injury if their cooks are contaminating food lol
My understanding is that you are correct in saying the right cause of the condition, but I'm pretty sure the theory of stress contributing to how large they get/how long healing takes is still generally accepted. Capsaicin causing a physical stress response of course, unless you also have nightmares about it or something
Stress lowers your immune response (as does smoking, which many people do to combat stress). Any natural healing process will go faster if you cut out stress factors. The stress itself can't cause the ulcers to appear on their own.
It's also possible to get ulcers from certain medication (including over the counter painkillers) so if the cooks are lacing the food with medication they could still cause them, I suppose…