Stools, bloody
Alternative names:
blood in the stool; hematochezia; melena; stools - black or tarry
Definition:
Melena is the passage of black, tarry stools. Hematochezia is the passage of red, bloody stools.
Considerations:
Blood, as seen in the stool, can originate anywhere along the intestinal tract. A black stool usually means that the blood is coming from the upper part of the tract. At least 2 Tablespoons (or 60 milliliters) of blood must have been lost in order to make the stool black. Maroon-colored stools suggest that the blood is coming from the middle portion of the intestinal tract, and bright red from the large bowel or rectum. See also GI bleeding.
The ingestion of black licorice, lead, Pepto-Bismol, or blueberries can all cause black stools or false melena. Stools should be tested for the presence of hidden blood.
Some of the conditions that cause bloody stools can also cause vomiting blood.
Common causes:
GI bleeding is the most serious source of bloody stools. The color can help to pinpoint the location of the bleeding.
Black color: Maroon color Bright red color: Note: There may be other causes of bloody stools. This list is not all inclusive, and the causes are not presented in order of likelihood. The causes of this symptom can include unlikely diseases and medications. Furthermore, the causes may vary based on age and gender of the affected person, as well as on the specific characteristics of the symptom such as quality, time course, aggravating factors, relieving factors, and associated complaints. Use the Symptom Analysis option to explore the possible explanations for bloody stools, occurring alone or in combination with other problems.
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