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Like marathons and super marathons, long-distance running may not always be what we think is a healthy badge. In fact, it may increase your Cancer riskAccording to a new study from Virginia.
Dr. Timothy Cannon of the Inova Schar Cancer Institute began working on the study, which noticed the 2025 American Society of Clinical Oncology (ASCO) annual meeting of supermarathon athletes under the age of 40.
To delve into the deeper he conducted a study of runners who completed at least five marathons or two supermarathons, but did not include those with a family history or other known risk factors.
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The study used 100 participants between the ages of 35 and 50 who completed at least five marathons or two supermarathons. (iStock)
“This study supports the hypothesis that extreme endurance runners have an increased risk of cancerous polyps,” Cannon told Fox News Digital.
The researchers examined 100 participants between the ages of 35 and 50 who had never had a colonoscopy but completed at least five marathons or two supermarathons. Individuals with hereditary cancer syndrome or inflammatory bowel disease are excluded to remain focused on the potential effects of endurance exercise.
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Each participant had colonoscopy during the study period. They also completed a survey on eating habits, gut history and long distance history Running mode.
He found that 15% of patients with adenoma or precancer growth disorder have a normal age range of 1-2%. More importantly, an astonishing 41% have at least one adenoma.
Each participant had colonoscopy during the study period. (iStock)
A team of gastroenterologists, pathologists and oncologists reviewed any growth found during the process to determine if they matched Advanced adenoma.
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“I’m surprised at how many runners have polyps,” Cannon said.
“I think they may have more adenomas and advanced adenomas than expected in that age group…but I didn’t expect 15% to be advanced.”
The average age of participants was 42.5, which was much lower than the typical screening age of 45 years.
Cannon said he “didn’t expect” 15% of subjects to have advanced adenomas, explaining that the number is much larger than expected. (iStock)
Cannon and other experts believe that intense endurance training can lead to repeated “gut stress.” During prolonged running, blood is transferred from the intestine, which can cause damage and inflammation. Over time, this can lead to mutations and polyps.
Experts warned that the results were uncertain, pointing out that the study lacked a control group and had not yet been peer-reviewed. Still, these numbers may make you sit up and pay attention.
“We don’t have a control group, which raises a question,” the doctor said.
According to Cannon’s patients, many gastroenterologists dismissed the bleeding after campaigning in normal events. (iStock)
He also admitted that the study did not describe a detailed family history, which could affect the results.
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Despite the results, this is not a sign of abandoning full-running.
“Let me say first of all people should Keep exercising.” Cannon emphasizes. “We have much more problems with not exercising than with too many exercises.”
He added that although the study supports the notion that extreme doses of exercise, such as supermarathons, may increase the risk of cancer.
The study did not describe detailed family history. (iStock)
For those who are very distant, it is important to monitor symptoms such as bleeding, persistent diarrhea, or abdominal pain.
Bleeding after running should not be considered normal or benign, and someone who experiences it should seek medical care.
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“As far as I know, no gastroenterologist expert pointed out that any rectal bleeding or blood on the stool is not attracted by people,” Cannon said.
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“But my patients told me that in fact, many gastroenterologists refuted the bleeding after campaigning in normal events.”
