People with inflammatory bowel disease are also more likely to get melanoma, Mayo Clinic researchers reported at the 2013 Digestive Disease Week meeting. The researchers analyzed 70 years' worth of data on 172,837 people with Crohn disease or ulcerative colitis, the most common kinds of inflammatory bowel disease, and found that their risk of melanoma was 37% higher. The U.S. has 1.5 million people with Crohn disease or ulcerative colitis; the researchers recommend that doctors urge them to protect themselves from melanoma by staying out of the sun.