Colon cancer is rising in young adults and doctors don’t fully know why

Colorectal cancer diagnoses are increasing in adults under 50, with cases appearing in people as young as their thirties, often without family history or warning signs. A Swiss study tracking nearly 100,000 cases over four decades found steadily rising rates in younger patients while rates decline in older adults due to screening programs. Younger patients face delayed diagnoses, with cancer often detected after it has already spread.