2. A change in bowel habits
Most changes in bowel habits are related to your diet and fluid intake.
Doctors sometimes see pencil-thin stools with colon cancer.
Occasionally, cancer exhibits continuous diarrhea.
Some people with cancer feel as if they need to have a bowel movement and still feel that way after they have had a bowel movement. If any of these abnormal bowel complaints last more than a few days, they require evaluation.
A significant change in bowel habits that cannot be easily explained by dietary changes needs to be evaluated.