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Marathon Runners Face Unexpected Colon Cancer Risk, New Study Suggests

Summary by Health
Researchers found a surprising number of serious athletes had early signs of disease.Fact checked by Nick Blackmertibor5 / Getty Images 15% of extreme runners had a precursor for colon cancer, compared to 5% of average adults.A new study found that serious distance runners were more likely to develop colon cancer than the average adult.Researchers think long runs may stress the gut—diverting blood flow and affecting bacteria—but more studies are…

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Researchers Discover Unusual Rate of Precancerous Polyps in Young Marathon Runners • Is Long-Distance Running Harmful or Just Masking Symptoms?

A recent study has revealed an unusually high number of pre-cancer lesions and polyps in the colon in marathon and ultra-marathon runners aged 35 to 50. While physical exercise has long been recognized for its benefits to overall health, this discovery raises questions about the potential risks associated with a particularly intensive sports practice. Physical activity remains one of the most accessible and effective ways to prevent many conditi…

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Health broke the news in United States on Thursday, August 28, 2025.
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