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Marathon runners show higher rates of precancerous polyps, study finds
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Health·6/4/2026AI summary

Marathon runners show higher rates of precancerous polyps, study finds

A study found that 15% of marathon and ultramarathon runners aged 35-50 had precancerous polyps, a rate 7-15 times higher than their peers. Researchers hypothesize that reduced blood flow to the intestines during long runs may cause inflammation and genetic mutations leading to polyp formation. They urge young runners experiencing recurrent rectal bleeding after long runs to undergo colonoscopies.

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