I have had bowel problems most of my life (flat stool, blood, cramps) 4 years ago at 22 I went for a colonoscopy and they found 1 small 1mm size polyp which turned out to be an adenoma. So I went back a year later and was clean. They said I have a spastic colon and hemmorhoids and come back in 3 years. It has been 3 years and I am terrified to go back. My symptoms are a little worse than before. Is it possible to have colon cancer 3 years after a clean colonoscopy at my age?