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.Read Moreyour-feed-health, your-feed-healthcare, Colon and Colorectal Cancer, Disease Rates, Millennial Generation, Joshua DembNYT > Health