上次检查身体护士提起一种把什么探测器弄到rectum里检查的，不过她说我这个年龄还不用检查那个。那个是检查什么的啊？是查肠癌的吗？那从多大就应该检查了啊？那个听上去很wierd，不过我也年纪不小了啊，以前看过关于肠癌的报道，觉得真是怎么死都比得肠癌好
现在我认识的人里听了好几个年纪轻轻就得这癌那癌死了的
从多少岁开始就应该一年检查两次身体了啊？是不是很多癌检查身体也根本查不出来啊，比如肝癌胃癌什么的？

do you mean colonoscopy? You are too young for that. If you have family history of colon cancer or any other lower GI malignancy, or family heredity multipolys, you should start colonoscopy from 35. Other risk factors include high-fat low-fiber diet, obese, etc. So I would say you don't have to worry about it for now.