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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

Dr. Michael Gabor
347 Doctors shared insights

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

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Black stool that is brown on inside. Could this be from too much Grape juice and oreos? How long should it take for stools to go back to normal color?

Watch: Stool can be colored based on foods we eat and food coloring, however black stool can be concerning in that it can be a sign of bleeding in the intestinal tract. If continues or associated with abdominal pain, lightheadedness, shortness of breath or any other unusual symptoms then see a doctor or ER as soon as possible ...Read more

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After EGD and Duodenal biopsy I see watery black stools. How long will this last or should I report it right away?

After EGD and Duodenal biopsy I see watery black stools. How long will this last or should I report it right away?

ASAP-you're bleeding: Melena, by definition, is passage of dark stools stained with denatured blood. As we established in prior healthtap answers, all dark stool is not melena, but the temporal relationship of biopsies & melena in your case is highly suspicious for unabated procedure-related hemorrhage. Call your endoscopist RIGHT NOW please as well as 911--& get to the Emergency Room for urgent care. ...Read more

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I have stomach pain and black stool not tarry just started today hurts occasionally how long should I wait before going to the doctors?

I have stomach pain and black stool not tarry just started today hurts occasionally how long should I wait before going to the doctors?

If melena, go NOW...: Melena, by definition, is passage of dark stools stained with denatured blood. As we established in prior healthtap answers, all dark stool is not melena. Your doctor, or even an over-the-counter test that you can purchase, can check to see if your dark stool contains blood. Needed is for you to provide a sample of the dark stool. False positive results can occur based on diet & stool additives. ...Read more

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Speaking of black stools, do you mean very dark brown or truly black?

Speaking of black stools, do you mean very dark brown or truly black?

Black: Black stools (melena) are potentially worrisome as this can be a sign of intestinal bleeding. A few other things can cause black stools (like iron supplements) but regardless, you should have it checked by your doctor. ...Read more

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Been having dark brown with mostly black stool this morning. Should I worry?

Yes: Black stool can be blood in there from the stomach or duodenum. A quick visit to the doctor can get the result with a quick test for blood.
It is something that should be checked by your physician. ...Read more

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What do you advise if I had dark brown with mostly black stool this morning. Should I worry?

If it was: Black, tarry and foul-smelling it could be related to GI bleeding. That would warrant medical eval. Take care. ...Read more

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I passed black stool 2 times &my OCCULT bood came +ve. My phyiscan prescribed me PANTOCID & now for last 2days I am passing normal stool. Is that ok?

Need further testing: It sounds like you could have an ulcer or pre-ulcer changes in the stomach if the black stools resolved with Pantocid, I would recommend evaluation with an upper endoscopy to assess the problem more fully. ...Read more

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Black stools after drinking. Is this a common side effect?

Black stools after drinking. Is this a common side effect?

Black stools: After drinking is an ominous sign for a gastric ulcer or gastritis, aggravated by the alcohol, leading to bleeding. The blood turns black when exposed to acid in the stomach and hence makes the stools black. Stop drinking! And go see a gastroenterologist to make the diagnosis and get you on a treatment plan before you do some serious damage. ...Read more

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Is it possible for one 30 ml of peptobismol to be enough to cause black stool for two days?

Peptobis Black stool: 33 from Balt asks is it possible for one 30 ml of peptobismol to be enough to cause black stools for 2 days. YES. But why taking it? If for abd pain then bleeding from an ulcer or cancer can also cause bloody stools. If an alcoholic bleeding varices can do it. You need to review with your team and have stool tested for blood. Failure to do this may result in you dying from a curable cancer. ...Read more

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Black stool, foul smell had a colonoscopy yesterday said everything looked good is this normal?

Black stool, foul smell had a colonoscopy yesterday said everything looked good is this normal?

Not if melena: Melena is dark stools stained with denatured blood, but all dark stool is not melena. False positive hemoccult results can occur based on diet & stool additives. However, colonoscopy can result in bleeding due to biopsies, scope abrasion/trauma, post-polypectomy oozing, etc. By all means, call your colonoscopist now & alert them to your concern--they know your risks & will be eager to assist you.. ...Read more

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Now am having black stool also. No blood seen now. Iam using medication for fissure and stool softners also?

Now am having black stool also. No blood seen now. Iam using medication for fissure and stool softners also?

Black stool: Black stool can be seen with bleeding in the upper gastrointestinal tract, taking iron, taking peptobismol or kaopectate. Bleeding from the anal or rectum would be bright red. Stool softeners don't cause black stool. A simple stool test in the doctor's office can detect occult blood. If stools are tarry and you feel weak, go to the hospital emergency room where prompt evaluation can be obtained. ...Read more

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Will contrast in a cat scan cause black stool?

No but see your doc!: The injected contrast is clear and mostly is eliminated by your kidneys.

The oral contrast is either clear or white.

Black stool could be from bleeding, possibly from your stomach or proximal small bowel.

See your health care provider asap! ...Read more

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Severe ulcerative colitis with loose, black stools?

Severe ulcerative colitis with loose, black stools?

See Dr: You have some bleeding - maybe - so you should call your doctor today and talk to them about it. They may need to change medications and do some tests. Don't delay. ...Read more

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What could cause black stools during the menstrual cycle?

What could cause black stools during the menstrual cycle?

Bleeding ulcer: Anti-inflammatory medications, such as Ibuprofen or naproxen, which are commonly taken for cramps, can cause the lining of the stomach and small intestine to wear down and an ulcer to form. The ulcer can ooze blood, which turns the stool black like tar. Also, pepto bismol (bismuth subsalicylate) or iron supplements are common causes. In any case, get it evaluated before any more blood might be lost! ...Read more

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Do bleeding gums and black stools have anything in common?

Do bleeding gums and black stools have anything in common?

Agree w Dr Hemming: Both can be related to bleeding problems. Recommend medical assessment. ...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


Feces (Definition)

Feces is the product of ...Read more