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Long-distance running, like marathons and ultramarathons, may not always be the health badge we thought it was. In fact, it could increase your cancer risk , according to a new study out of Virginia.

Dr. Timothy Cannon of the Inova Schar Cancer Institute began work on the study, which was presented at the 2025 American Society of Clinical Oncology (ASCO) Annual Meeting in Chicago, after noticing ultramarathoners under 40 were showing up with advanced colon cancer.

To dig deeper, he launched a study of runners who had completed at least five marathons or two ultramarathons, excluding those with family history or other known risk factors.

RISK OF COLON CANCER SLASHED BY EATING SPECIFIC TYPES OF VEGETABLES, STUDY FINDS

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