10 Warning Signs of Colon Cancer Not To Be Ignored

2Changes in Stools

If you notice that your stools are very dark in color, appearing maroon or black, and sticky, then this could be caused by bleeding due to bowel cancer. You may experience normal bowel movements in between these abnormal stools. Your stools may also become very narrow or ribbon-like, with the stool being only as wide in diameter as a pen.