What Happens To Your Body During An Ultramarathon

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Ultramarathons are races ranging from 50 to 4,345 km. During races, the most common problems for runners are nausea and vomiting. Some runners may get blurry vision. Sleepiness and hallucinations are problems in longer races lasting more than 24 hours.
But even if you’re running in more comfortable weather, you could be feeling sick to your stomach. One of the most common issues in any ultramarathon is nausea and/or vomiting. It affects about 37% of people who complete a race, but it’s also the number one reason runners won’t finish in the first place.

That’s because running disrupts your digestion. It diverts blood away from your stomach to your muscles. And since ultramarathons last so long, many races provide sandwiches, pasta, and other carb-loaded meals. As a result, that food will sit around undigested, causing problems. But if your stomach isn’t slowing you down, your eyes could be causing you grief.