Experts warn younger people not to dismiss symptoms such as rectal bleeding as diagnoses rise for those under 50 Sign up for the Breaking News US email to get newsletter alerts in your inbox Experts warn younger people not to dismiss symptoms such as rectal bleeding as diagnoses rise for those under 50 Sign up for the Breaking News US email to get newsletter alerts in your inbox Colorectal cancer is now the leading cause of cancer death in the US for people under 50, according to a new analysis