Stomach infection and inflammation linked to Parkinson’s risk
Both conditions were linked to slightly higher Parkinson’s risk than in matched comparison groups, with a hazard ratio, a relative risk measure, of 1.14.
Our read
Populations- Studied:
- Cohort study of adults older than 35 in Sweden, against matched comparison participants
- What changed:
- Parkinson's disease risk was higher with infection and gastritis than in matched comparison groups (hazard ratio 1.14)
- The catch:
- Registry diagnoses of Parkinson's disease were not perfectly accurate
- In the record:
- The 29th paper on helicobacter pylori infection with results in people; 52 on record in all.
Editor of record: Boris Djordjevic · AgingResearch.News
An observational matched cohort study followed adults older than 35 in Sweden whose tissue samples showed Helicobacter pylori infection, gastritis or ulcers of the stomach or upper intestine, alongside matched comparison participants. Helicobacter pylori is a stomach bacterium; gastritis is inflammation of the stomach lining. The infection group included 48,258 people and 231,805 comparison participants; gastritis, 242,325 and 1,053,688; and ulcers, 52,761 and 274,313. These groups overlapped.
Median follow-up ranged from 6.7 to 9.3 years. After adjustment for factors including healthcare visits, infection and gastritis were linked to slightly higher Parkinson’s risk. Unadjusted diagnosis rates per 1,000 person-years were 1.0 versus 0.9 for infection and 1.1 versus 1.0 for gastritis. The gastritis association persisted up to ten years after diagnosis. Ulcers had no clear association with Parkinson’s; the range of likely values included no difference.
Why it matters
Gastrointestinal symptoms may precede Parkinson’s diagnosis by decades, raising questions about the gut’s role in this age-related disease. The authors concluded that the infection and gastritis may have some relevance but were unlikely to be major contributors to its development.
Caveats
The observational design cannot establish cause and effect, and registry diagnoses of Parkinson’s were not perfectly accurate. The study excluded people aged 35 or younger and those already diagnosed with Parkinson’s.
The paper
Karolinska Institutet
Journal of Parkinson's Disease, Jul 15, 2026, Open access
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