H. pylori is common and more dangerous than many people realize.
H. pylori is a bacterial infection that affects around 40% of people in the U.S. and two-thirds of people worldwide. Most people don’t know they have it, but over time, it can lead to serious health problems, including ulcers and stomach cancer.
Elbaiomy, R.G., Luo, X., Guo, R. et al. Antibiotic resistance in Helicobacter pylori: a genetic and physiological perspective. Gut Pathogens 17, 35 (2025). https://doi.org/10.1186/s13099-025-00704-5. CC-BY-4.0
These could be signs of an H. pylori infection — a common but often overlooked cause. Check the Symptoms page to see what else to watch for.