There’s a Troubling Rise in Colorectal Cancer Among Young Adults

Some experts blame our modern, sugary diet, while others think that gut microbiome changes and sedentary lifestyles may play a role. Altogether, the causes are far from clear.

Written byKatarina Zimmer
| 7 min read
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ABOVE: Adenomatous polyp
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Rachel Winegar, a mother of three from Colorado, has had trouble with her digestive system for as long as she can remember. So when she neared 30 and her problems intensified, colorectal cancer did not cross her mind. Her doctor figured it was perhaps a chronic condition like celiac disease, ulcerative colitis, or Crohn’s disease. She was suffering: “rectal bleeding even while passing gas, full feeling, bloated, nauseous, low energy, feeling of sitting on something, pencil-thin stools,” she writes in an email to The Scientist.

After she finally went to a doctor, Winegar was scheduled for a colonoscopy. But instead of finding evidence for any of those conditions, her doctor discovered a mass the size of Winegar’s palm in her rectum, she recalls. It was stage 4 cancer. “My husband and our three kids and I have had our lives turned upside down because of ...

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Meet the Author

  • katya katarina zimmer

    After a year teaching an algorithm to differentiate between the echolocation calls of different bat species, Katarina decided she was simply too greedy to focus on one field of science and wanted to write about all of them. Following an internship with The Scientist in 2017, she’s been happily freelancing for a number of publications, covering everything from climate change to oncology. Katarina is a news correspondent for The Scientist and contributes occasional features to the magazine. Find her on Twitter @katarinazimmer and read her work on her website.

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