Stress can not directly cause ulcers. Ulcers are caused by bacteria in the stomach. Stress can help to cause ulcers indirectly.
For instance, if you are so stressed that you have ceased eating, this may contribute to the development of an ulcer. You can find more information here: kidshealth.org/teen/diseases_conditions/....
Stress may aggravate the symptoms of a peptic ulcer by increasing stomach acid and slowing digestion.
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