A new analysis of dozens of studies has identified the most common warning symptoms in adults under 50, whose rates of colon and rectal cancer are on the rise. A new analysis of dozens of studies has identified the most common warning symptoms in adults under 50, whose rates of colon and rectal cancer are on the rise. your-feed-health, your-feed-healthcare, Colon and Colorectal Cancer, Disease Rates, Millennial Generation, JAMA Network Open, Research, Youth NYT > Science