Ignore this red flag, and it could come back to bite you in the rear.

A new study has identified the “strongest predictor of colorectal cancer” in adults under 50 — increasing the odds of a diagnosis by a staggering 850%.

“This research lends support to the question of who does or doesn’t warrant a colonoscopy,” Dr. Sandra Kavalukas , a colorectal surgeon at the University of Louisville School of Medicine and lead author of the study, said in a statement. 3

Generally, Americans without a family history of the disease are advised to start getting screened at age 45. But experts warn that this guidance leaves many younger adults — who are experiencing the fastest rise in colorectal cancer rates — dangerously exposed.

“Many of the early-onset colorectal cancers that I see have no

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