What Are the Signs of Colorectal Cancer?

Diarrhea, constipation or narrowing of the stool that lasts for more than a few days, as well as blood in the stool, cramping or abdominal pain, are all signs of colorectal cancer. African-Americans are about 20% more likely to get it and about 40% more likely to die from colorectal cancer than any other. There's no sure way to prevent it, but there are things that might help lower your risk. Early screening is the key. Dr. Holly Phillips explains.