06/09/2026
A preliminary study led by Dr. Timothy Cannon, Sheridan Director, Molecular Tumor Board, Co-Director, Gastrointestinal Cancer Program, Inova Schar Cancer, examined 94 runners (ages 35 to 50) who had completed multiple marathons or ultramarathons.
Nearly half had colon polyps, and about 15% had advanced polyps, which can sometimes develop into cancer. Dr. Cannon suggested extreme running may temporarily divert blood away from the gut to the legs, potentially affecting the intestinal lining over time.
A larger follow-up study is now underway to better understand the findings.
If you’re an endurance athlete and have persistent gastrointestinal issues like cramping or re**al bleeding, it’s important to see a doctor. 🩺
Learn more: https://bit.ly/3Qrss10
A preliminary study found nearly half of a sample group of marathon runners had colon polyps, which can sometimes lead to cancer. Timothy Cannon, an oncologist and lead author on the study, suggests extreme running may divert blood from the gut to the legs, which deprives gut cells of blood and oxyg...