This group is considered at average risk for colon cancer or colon polyps.

这群人拥有中等的风险罹患大肠癌或长大肠息肉。

We don't know exactly what causes the majority of colon polyps and colon cancers.

我们还不确定什么导致了大多数的大肠息肉和癌症的形成。

There's also a higher risk group that includes people with personal or family histories of colon polyps or cancer, and those who suffer from inherited genetic syndromes, or inflammatory diseases, like Crohn’s disease and ulcerative colitis.

还有一个风险较高的群体，包括有结肠息肉或癌症个人或家族史的人，以及患有遗传性遗传综合征或炎症性疾病（如克罗恩病和溃疡性结肠炎）的人。