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Black or tarry stools

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Black or tarry stools with a foul smell are a sign of a problem in the upper digestive tract.

The term melena is used to describe this finding.

Alternative Names

Oilcloth Bag Messenger Blue Crossbody Print Owl Shoulder Designer D Satchel Light Bag Fashion Stools - bloody; Melena; Stools - black or tarry; Upper gastrointestinal bleeding

Considerations

Eating black licorice, blueberries, blood sausage,  or taking iron pills, activated charcoal, or bismuth medicines like Pepto-Bismol, can also cause black stools. Beets and foods with red coloring can sometimes make stools appear reddish. In all these cases, your doctor can test the stool with a chemical to rule out the presence of blood.

Bleeding in the esophagus or stomach (such as with peptic ulcer disease) can also cause you to vomit blood.

Causes

The color of the blood in the stools can indicate the source of bleeding.

Black or tarry stools may be due to bleeding in the upper part of the GI (gastrointestinal) tract, such as the esophagus, stomach, or the first part of the small intestine. In this case, blood is darker because it gets digested on its way through the GI tract.

D Light Owl Print Blue Oilcloth Messenger Fashion Bag Shoulder Bag Satchel Crossbody Designer Red or fresh blood in the stools (rectal bleeding), is a sign of bleeding from the lower GI tract (rectum and anus).

Peptic ulcers are the most common cause of acute upper GI bleeding. Black and tarry stools may also occur due to:

When to Contact a Medical Professional

Call your health care provider right away if:

  • You notice blood or changes in the color of your stool
  • You vomit blood
  • You feel dizziness or lightheadedness 

In children, a small amount of blood in the stool is most often not serious. The most common cause is constipation. You should still tell your child's provider if you notice this problem.

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Your provider will take a medical history and perform a physical exam. The exam will focus on your abdomen.

You may be asked the following questions:

You may need to have one or more tests to look for the cause:

Severe cases of bleeding that cause excessive blood loss and a drop in blood pressure may require surgery or hospitalization.

References

Chaptini L, Peikin S. Gastrointestinal bleeding. In: Parrillo JE, Dellinger RP, eds. Critical Care Medicine: Principles of Diagnosis and Management in the Adult. 4th ed. Philadelphia, PA: Elsevier Saunders; 2014:chap 76.

McQuaid KR. Approach to the patient with gastrointestinal disease. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 25th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 132.

Meguerdichian DA, Goralnick E. Gastrointestinal bleeding. In: Walls RM, Hockberger RS, Gausche-Hill M, eds. Rosen's Emergency Medicine: Concepts and Clinical Practice. 9th ed. Philadelphia, PA: Elsevier; 2018:chap 27.

Savides TJ, Jensen DM. Gastrointestinal bleeding. In: Feldman M, Friedman LS, Brandt LJ eds. Sleisenger and Fordtran's Gastrointestinal and Liver Disease. 10th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 20.


Review Date: 4/12/2018
Reviewed By: Subodh K. Lal, MD, gastroenterologist with Gastrointestinal Specialists of Georgia, Smyrna, GA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
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