New research suggests a potential link between extreme running and colorectal cancer risk. Long-distance runners might face a higher chance of developing certain precancerous growths. Experts presented these findings at a recent oncology conference.
The study started after doctors noticed a trend. Several young, very healthy marathon runners had advanced colon cancer. Researchers investigated if intense endurance exercise played a role. They found that 15% of the serious runners in the study had advanced precancerous polyps. This rate is higher than in the average adult population.
Why might this happen? During a very long run, the body changes blood flow. It diverts blood away from the gut to power the working muscles. This action is known as bowel ischemia. Repeated lack of blood flow can cause inflammation and stress in the colon. Scientists think this process could raise the risk of cancer over time.
Do not stop running because of this study. Experts agree that exercise is still great for your overall health. However, runners must be alert for symptoms. You should talk to your doctor right away if you see blood in your stool after a long run. Doctors have often dismissed this as “runner’s colitis.” This study suggests that screening is very important for this active group.
