"Bowel movements change from person to person depending on his or her diet, physical activity, how much water they consume, and what medications they take," said M. Nuri Kalkay, a retired gastroenterologist and health blogger.
"If your poop is black, not just dark brown, you should be concerned. This means bleeding is happening from an upper GI source like the esophagus, stomach or small bowel," explained Jeffery M. Nelson.
"If you find blood in your stool, this can indicate a bleeding source from the anal canal or a low rectal source. Things like internal hemorrhoids, anal fissures, rectal polyps or rectal cancers can all do this," said Nelson.
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