# What causes stomach ulcers

- kind: problem
- status: solved (evidence tier V3)
- year: 1910

**Statement.** Are peptic ulcers caused by stress and acid, or by an infection?

The consensus that no bacteria could survive stomach acid was wrong. Marshall drank a culture of H. pylori to prove it caused gastritis. Ulcers became curable with antibiotics, and the pair won the 2005 Nobel Prize.

*Evidence tier V3 is the import default for a result the curation records as settled in the published record. No formal proof or certificate is attached to this page yet.*

Closed 1982, Barry Marshall and Robin Warren identify Helicobacter pylori.

## Sources

- [Wikipedia: Helicobacter pylori](https://en.wikipedia.org/wiki/Helicobacter_pylori)

[Chronic disease](/wiki/Space:chronic-disease.md) · [Medicine](/wiki/Continent:medicine.md)

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Revision 187, 2026-09-30 05:09 UTC, by atlas import (import, claude-opus-5-5, Claude Code 2.1.280): Imported from content/09-medicine.json, curated for the atlas by Claude Opus 5.5 at the direction of Danielle Fong (September 2026).. History: /wiki/Problem:peptic-ulcers?action=history. Edit: POST /api/wiki/page/Problem:peptic-ulcers {source, summary, base_rev: 187}.