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Doctor insights on: Thick Black Stool After Running Long Distance

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Lately I have black stool after running, even if it's just a one mile run. Colonoscopy and endoscope are clean. What would cause the black stool?

Lately I have black stool after running, even if it's just a one mile run. Colonoscopy and endoscope are clean. What would cause the black stool?

Blood-other causes: Black stool ( melena) can be caused from old blood in the stomach/intestines, . Licorice ( black) can also cause this. Call your physician for upper endoscopy results and photos, get routine blood testing.Defintely do not ignore! ...Read more

Melena (Definition)

Melina is blood in the stool that is black, tarry, sticky, and smelly. The blood in melena comes from high up in the gastrointestinal tract, and gets partially digested which is why it changes to melena. Bright red blood comes from lower ...Read more


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My 4 month baby has been having running-black stools twice a day for over a week, she is formula fed, we change formula, 2 weeks ago. ?

My 4 month baby has been having running-black stools twice a day for over a week, she is formula fed, we change formula, 2 weeks ago. ?

Pediatrician: Iron fortified formula may have a darker appearance to the stool. If it is black or very dark, bleeding from the GI tract or upper airway is a possibility. It is important to notify your pediatrician. ...Read more

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Diet change. 1 avocado/day. Dark chocolate and same flavor ice cream everyday. Running changed to 2 mi from 4, 3x/wk. Black stool last 4days. Related?

Diet change. 1 avocado/day. Dark chocolate and same flavor ice cream everyday. Running changed to 2 mi from 4, 3x/wk. Black stool last 4days. Related?

Not likely: The color of the stools can certainly be affected by the type of food that we eat, but usually not black unless you eat raw red meat or other dish containing animal blood. If you are really having jet black and tarry stools, then it may suggest bleeding inside the stomach or small bowels. You need to see your doctor right away for urgent evaluation. ...Read more

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Black stool brown urine extremely tired even after night trying to sleep. Sweating to extreme running down face. What is this?

Black stool brown urine extremely tired even after night trying to sleep. Sweating to extreme running down face. What is this?

It could be many : Things. A GI bleed comes to mind. I recommend you go to the er for evaluation. Don't drive if you are too fatigued. Best wishes. ...Read more

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How long to wait for medical advice if you have black stools?

How long to wait for medical advice if you have black stools?

Sorry, do you mean: Medical advice from healthtap? I just now read your question. Black stools that are sticky and smell bad can represent gastrointestinal bleeding. But some meds (i.e., pepto bismal or iron) and some food can cause black or dark stool as well. Get it medically checked. ...Read more

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How long can I wait with black stools to see if it goes away without seeing a doctor?

How long can I wait with black stools to see if it goes away without seeing a doctor?

GI Bleeding?: Black stools can be caused by harmless things such as certain foods (e.g., blueberries, black licorice) or meds such as bismuth (pepto-bismol) or iron supplements. But it may be a sign of bleeding somewhere in your digestive tract, which can be serious (and doesn't always cause pain). If you haven't eaten these foods/meds & you're having black stools, or if you have vomiting or pain, see your dr. ...Read more

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How long do black stool last after you had several teeth pulled?

How long do black stool last after you had several teeth pulled?

How much bleeding?: Ingesting blood can cause the stools to be black. GI bleeding can do this also. This color is a result of digested blood. Recurring black stools, especially those that smell foul, should be investigated by a physician. ...Read more

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How long before black stools clear?

Depends on the cause: If black stools are due to bleeding from the stomach it may take few days with the treatment of underluing cause like gastric erosions, ulcers etc.If they are not due to bleeding and from eating certain foods, meds and taking iron than it will clear if you stop the iron or the foods which are causing it. ...Read more

Dr. Irina Medwin
115 doctors shared insights

Black Tar Colored Stools (Definition)

Black stool is a symptom in which a person's stool (poop) has a black color, or sometimes a very dark red color. Black stools are usually due to old blood (fresh bleeding is red in color). ...Read more


Stool Is Black (Definition)

Stool is black is a symptom in which there is black, reddish-black, or very dark coloring to stools. Black stools can be due to old blood in the stools ...Read more