colon cancer?

I went to the ER because of massive bleeding in my stool-then I went to a specialist and he said I had a large tumor in my intestines.

My symptoms have been: blood in stool, abdominal cramps, weight loss, nausea, very weak and tired

I have to have a colonoscopy next week but I was always under the assumption that only older people can get colon cancer

I am very nervous…could I have colon cancer?