Colorectal cancer is the second leading cause of cancer deaths in the U.S. and, alarmingly, rates are rising in younger adults. On this 20-Minute Health Talk, Marc Greenwald, MD, discusses risk factors, symptoms, treatments and the importance of early screening. He also addresses common concerns about colonoscopy, from advances in prep to the lifesaving procedure itself, and helps listeners understand the importance of being proactive about their health.  About the expert Dr. Greenwald is chief of colorectal clinical services; surgeon-in-chief; and director of the rectal cancer program at North Shore University Hospital.