Understanding the Significance of Bowel Movement Colors

6. Black

Surprisingly, black bowel movements are not always bad. Typically, they are caused by something that is black or dark in color, including licorice, black or blueberries, or food coloring. If you notice black bowel movements, you should try to make a list of the foods you have recently eaten and see if any of them are very dark in color. Iron supplements can also cause this coloring change, so consider what medications you have taken recently as well. Typically, black coloring caused by foods or medications will not result in changes in consistency or appearance, so do not be concerned if it otherwise looks normal.