Add Yahoo as a preferred source to see more of our stories on Google. While not the most common sign, narrow stools can be indicative of colorectal cancer. Tetra Images via Getty Images With more and ...

According to the American Cancer Society, 20% of all new colon cancer cases happen in people under the age of 55. That's compared to about 10% back in the 1990s.

Because colorectal cancer is on the rise in people younger than 50, major medical associations, including the ACS and the U.S. Preventive Services Task Force, have updated their guidelines to ...