7 doctors weighed in:

Is black stool a symptom of colon cancer or ulcer?

7 doctors weighed in
Dr. Gurmukh Singh
Pathology
3 doctors agree

In brief: Depends

There are many causes of black tarry stool.
The common issue is bleeding in the intestine. Bleeding may be due to ulcers in the stomach, or intestine. Oral iron intake may produce dark stool. Colon cancer is one of the causes of bleeding in the intestine. It would be prudent to see your doctor to determine the cause of dark stools, especially if it is due to bleeding in the intestine.

In brief: Depends

There are many causes of black tarry stool.
The common issue is bleeding in the intestine. Bleeding may be due to ulcers in the stomach, or intestine. Oral iron intake may produce dark stool. Colon cancer is one of the causes of bleeding in the intestine. It would be prudent to see your doctor to determine the cause of dark stools, especially if it is due to bleeding in the intestine.
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Dr. Myron Arlen
Surgery - Oncology
1 doctor agrees

In brief: Ulcer

Bleeding from a tumor of the colon results in the presence of blood in the stool.
This blood is for the most part red, but may have signs of some decomposition. When blood is released from a stomach ulcer, the acid that is present breaks the Hgb down to result in a black appearing stool which is not seen is colon malignancies.

In brief: Ulcer

Bleeding from a tumor of the colon results in the presence of blood in the stool.
This blood is for the most part red, but may have signs of some decomposition. When blood is released from a stomach ulcer, the acid that is present breaks the Hgb down to result in a black appearing stool which is not seen is colon malignancies.
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1 comment
Dr. Richard Perlman
Dr Arlen is a very smart man. You should not ignore these symptoms (unless you are taking excessive amounts of iron supplements. Even so, you should be checked out by a physician.
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