By 
Rusha Modi
 | 
TED-Ed Original

The surprising cause of stomach ulcers

It's a common misconception that stomach ulcers are caused by emotional upset psychological distress or spicy food. Yet no convincing study has ever demonstrated that these factors directly cause ulcer disease. So what does cause stomach ulcers? Rusha Modi explains how one doctor's famous (and dangerous) experiment led us to the answer.

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