EXCLUSIVE: What IS causing the mystery uptick in colon cancer among under-40s? Experts say fungus and overuse of antibiotics could be behind the rise

Colon cancer is expected to become the number one cause of cancer-related deaths in people under 55 by the end of the decade — and experts are straining to understand why.

The disease is currently the second-leading cause of cancer deaths in the US, mostly among older adults, but a mysterious rise is now being detected in younger generations.

Nearly double the number of under-55s are being diagnosed with the cancer now compared to a decade ago, while the death rate is expected to have risen 90 percent over the two decades to 2030.

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