The Truth About PPIs: Dispelling Myths with 2026 Evidence

Dispelling PPI Myths: The Evidence (2025–2026)Myth 1: "PPIs cause stomach cancer."

The Evidence: A massive study of over 180,000 people in five Nordic countries (Denmark, Finland, Iceland, Norway, and Sweden) found no association between long-term PPI use and stomach cancer (Adjusted Odds Ratio 1.01). The researchers showed that earlier studies were flawed because they included patients who were using PPIs to treat symptoms of a cancer that was already present but undiagnosed.

• The Source: Duru, O., et al. (2026). Long-term use of proton pump inhibitors and risk of stomach cancer: population-based case-control study in five Nordic countries. The BMJ, 392, e086384.

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Myth 2: "PPIs cause Dementia or Alzheimer’s."

The Evidence: A 2025 "Umbrella Review" (an overview of multiple systematic reviews) analyzed 18 studies with over 6.3 million participants. It concluded there is no consistent evidence that PPIs cause dementia. The "subgroup" signals in older adults were attributed to general health decline and age rather than the medication itself.

• The Source: Peng, T. R., et al. (2025). Inconsistency in the Association Between Proton Pump Inhibitor Use and Dementia Risk: An Updated Meta-Analysis. Journal of Clinical Medicine / PMC. * Direct Link: (Published/Updated Jan 2026)

Myth 3: "They cause Chronic Kidney Disease (CKD)."

The Evidence: A 15-year study following 300,000 patients at the Karolinska Institutet found that while there is a correlation with kidney issues, it is often due to the "poorer baseline health" of the patient (diabetes, age, etc.) rather than the PPI itself. The risk of sudden kidney injury (AIN) remains "rare or very rare."

• The Source: Chen, K., et al. (2025). Longitudinal trajectories unravel the complex interplay of medication, cardiovascular events, chronic kidney disease, and mortality. Scientific Reports, 15, 35577.

• Direct Link: (October 2025)