Stool color is usually explained by diet, but certain shades — especially tarry black or unexplained bright red — can signal a condition that needs medical attention.
Most red bowel movements are not a reason to be concerned. Like most other color changes, they are often a result of something you ate. Some of the most common culprits include red sports drinks or fruit punches, red velvet cake, and red gelatin. Even natural foods, like beets, can cause your bowel movement to become reddish in color. If you notice red coloring, you should always try to remember whether there were any items that you ate or drank that might have caused the color change. If so, avoid eating those items temporarily and make sure the problem stops, just to be sure that you have correctly diagnosed the cause.

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