Anyone can occasionally have narrow stools. As long as bowel movements are otherwise normal, this usually isn't cause for concern. However, several possible causes of thin stools warrant attention.

Other colorectal cancer signs and symptoms include persistent changes in bowel habits, such as diarrhea, constipation, narrow stools, or still feeling that you need to have a bowel movement ...

Her husband, holding up two poo-shaped examples made of clay, added: "Change of stool calibre. So it was like this and now it's pencil thin stools." "Number four: unexplained iron deficiency ...