Possibilities...: Blood in stool is a warning sign. Causes of bleeding may be predictable (e.g. rectal trauma, fissure, hemorrhoids with straining), but evaluation is always appropriate. A rule of thumb (but not absolute): black stool means bleeding comes from upper GI tract; grape jelly stool from small bowel; silver stool from biliary tree; burgundy stool from right colon; red blood from left colon to anus.
Answered 4/22/2016
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