“Colorectal Cancer Statistics, 2023,” CA: A Cancer Journal for Clinicians, March 1, 2023. (Open access)
“Despite continued overall declines, CRC is rapidly shifting to diagnosis at a younger age, at a more advanced stage, and in the left colon/rectum.” … “reflecting changes in underlying disease risk of unknown etiology.”
From the American Cancer Society.
See also: “Colorectal Cancer Soaring in Young Adults; Are Smartphones in the Mix?”
https://microwavenews.com/papers/colorectal-cancer-rising-among-young