Even more colorectal cancer cases are being found in adults under 50, and a new collection of research suggests that a surge in screening may be tied to many of the more recent diagnoses – but not the overall trend.

The American Cancer Society says an uptick in colon cancer cases in the 45-49 age group is a result of lowered screening ages leading to earlier detection.

Colorectal cancer rates are rising sharply in adults under 50. While early screenings help, underlying causes remain unknown—raising urgent questions about environment, diet, and how to lower personal risk.