Been having thin/narrow stools.clear rectal exam by gp/no blood in stool.should i fear colon cancer?i'm 39 &had adenocarcinoma insitu of cervix 4yrago

Possible lesion: In situ adeno unrelated unless some for of radiation employed that could narrow distal bowel. Narrowing of stool suggests that there is some constriction of bowel causing a narrowing of the lumen and thus the stool. Blood does not have to be present but relying on a gp rectal not satisfactory. Sigmoidoscopy at a minimum and colonoscopy more accepted for this problem.