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Doctor insights on: Black Stool After Diarrhea

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Why am I having green black stool after diarrhea?

Why am I having green black stool after diarrhea?

Green black stools: It may represent a normal stool color but it should be tested to see if tests heme positive. That is it tests positive for blood. ...Read more

Dr. Oscar Novick
2,187 Doctors shared insights

Loose Stools (Definition)

Loose stools is a symptom in which a person's stool (poop) does not hold its shape after it goes into the toilet. Instead of remaining a shaped piece of poop, the poop spreads out in the toilet bowl water. Very loose stool is called diarrhea. Loose stool can be caused by infections, certain foods or drinks, ...Read more


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I'm 49 year old women. My dr put me on iron pills now I have black stools and diarrhea is this normal.

I'm 49 year old women. My dr put me on iron pills now I have black stools and diarrhea is this normal.

Iron in stool: Iron tabs do blacken stools. Iron typically constipates, but can alter stool to be looser in some. I incline to worry that you may have an intestinal bleeding source - coincidentally, not derived from iron. I advise you to stop iron and seek stool blood testing tonight or tomorrow am. ...Read more

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My husband has black stools 4th day. No signs of pain, vomiting, or diarrhea. What can it be?

My husband has black stools 4th day. No signs of pain, vomiting, or diarrhea. What can it be?

If stools are: Black, tarry and malodorous - this could be due to bleeding in the GI tract. It can also be due to eating certain foods or some medications. If there is any chance this is melena (blood) then he needs prompt medical eval. ...Read more

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Does eating too much licorice cause diarrhea or black stools?

Does eating too much licorice cause diarrhea or black stools?

Yes, but...: Dark-colored stools may result from iron supplements, foods you eat (like a lot of spinach), substances (like peptobismol), but most significantly suggests bleeding. When blood is denatured by acid in your stomach, as from ulcers, stools will turn tarry ("melena"). Blood may also be ingested from nose bleeds, bleeding gums... Persistent melena (without obvious cause) & symptoms warrants md visit. ...Read more

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I've had black stools for 2 days. Should I go to the emergency room? No pain, no fever, no diarrhea

I've had black stools for 2 days. Should I go to the emergency room? No pain, no fever, no diarrhea

Unsure: If ate dark food, peptobismol, can color stools but if on pain meds like nonsteroidals like asprin, advil/aleve can cause ulcer, dark stools usually mean blood from up high in g.i.tract like stomach or duodenum, by the time it gets to colon turns black; stop those pain meds take otc prilosec or generic for 14 days to see if resolves if nt see dr. Take tums/Mylanta tooas dir. If smoke stop;ulcer ...Read more

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Bright yellow stool followed by black stool followed by tannish color stool. All diarrhea. All looked like had littlewhite worms as well. Er or no?

Primary care: No. You do not have an emergency. You have a primary care problem. Contact your family doctor for instructions. ...Read more

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I threw up about 3 or 4 times one day ago, had diarrhea and black stool. Are these symptoms of the flu? If so how long do they last?

I threw up about 3 or 4 times one day ago, had diarrhea and black stool. Are these symptoms of the flu? If so how long do they last?

See a doctor: Tarry stools can be a sign of bleeding in the gastrointestinal tract."flu" is actually a respiratory illness with fevers, sneezing and cough". This sounds very different. ...Read more

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I'm having diarrhea, black stool w/ milk of magnesia (magnesium hydroxide). Why is that?

I'm having diarrhea, black stool w/ milk of magnesia (magnesium hydroxide). Why is that?

Milk of Magnesia (magnesium hydroxide): Milk of magnesia (magnesium hydroxide) can cause diarrhea as a side effect. I was unable to find black stool listed as a side effect of milk of magnesia (magnesium hydroxide). Did you take any iron or pepto bismal? Black, tarry, foul smelling stool could be melena (gi bleed). Please get seen promptly for signs of melena. Advise your dr regardless. ...Read more

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Sudden stomach pain went diarrhea and very black stool still having those mild abdomen cramps heard black stool is bad need to know please thx?

Sudden stomach pain went diarrhea and very black stool still having those mild abdomen cramps heard black stool is bad need to know please thx?

Black Stools: I would consult a gastroenterologist if possible. What you describe sounds like an episode of GI bleeding. At your age, I would be concerned about a bacterial infection, or some other pathogen. Regardless, I would follow up with your doctor. ...Read more

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I either have diarrhea or constipation. Black stool (once) Pains. Brown mucus & gas w/ constipation Little blood. Bloating. Nausea. Tired. Ideas?

Medical eval needed.: These changes in bowel habitus are not normal. Black stool - if tarry & malodorous could represent bleeding. The obvious blood in stool also warrants assessment. You need assessment to see if you have an inflammatory or infectious condition that is causing these changes. Take care. ...Read more

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To calm severe stomach flu-5 doses of kaopectate (kaolin and pectin) and three capletes of anti diarrhea med cause black stool?

To calm severe stomach flu-5 doses of kaopectate (kaolin and pectin) and three capletes of anti diarrhea med cause black stool?

Yes: The active ingredient in kaopectate--bismuth subsalicylate--turns stool a dark color. It can turn green or black and can persist a few days after stopping the medicine. If the black color lasts beyond three days after the medicine or is very dark or tarry (blood can cuase this change), see a doctor. ...Read more

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I had diarrhoea for 4 days and now my stool is black why is that?

Pepto Bismal: Your stool is black because you used pepto bismal. You do not have a GI bleed and do not need to see a physician about this. ...Read more

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What does it mean if I have black stools?

What does it mean if I have black stools?

Blood or iron: Vitamines containin iron, iron tablets, and pepto bismol (bismuth subsalicylate) can all cause black stools. Bleeding in the stomach can also cause black stools. ...Read more

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Had black stools today should I be worried?

Had black stools today should I be worried?

Likely not: Wouldn't worry about one episode, may be dietary related. If however they persist and you have other symptoms (abdominal pain, dizziness) need evaluation to be sure you do not have gastrointestinal bleeding. ...Read more

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What does it mean if you have black stools?

What does it mean if you have black stools?

Dark-colored stool: Dark-colored stools may result from iron supplements, foods you eat (like a lot of spinach), substances (like peptobismol), but most significantly suggests bleeding. When blood is denatured by acid in your stomach, as from ulcers, stools will turn tarry ("melena"). Blood may also be ingested from nose bleeds, bleeding gums. Silver-colored stool suggests bleeding from the biliary tree. Get checked. ...Read more

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I was wondering are occasional black stools bad?

Depends on your: Diet. If you eat beets or take pepto bismol (bismuth subsalicylate) or iron supplements occassionally and it is followed by a black stool, probably not but black stool without an obvious cause should not be ignored. It is not normal and may indicate a source of upper GI bleeding. See a GI doctor for a thorough evaluation. ...Read more

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I have had black stools. What is going on and what does this mean?

Bleeding?: It may represent bleeding somewhere in your GI tract so go see your doctor. ...Read more

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What to do after seeing black stool?

What to do after seeing black stool?

It could be related: To medication (i.e., pepto bismal). But if it is black, tarry, sticky and foul smelling then it may be due to a GI bleed and needs medical evaluation. Take care. ...Read more

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I have brown with mostly black stool?

I have brown with mostly black stool?

Problem: Black stools or melena, is always considered blood. It usually comes from the stomach or the beginning parts [higher up in our jargon] of the small intestine. Bleeding from colon usually comes out red. Black or red stools need to be investigated. ...Read more

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Is black stool in an adult, dangerous?

Sometimes: Black stool could be related to taking medicines like iron or peptobismal. But if stool is black, foul smelling and sticky - that could be a gastrointestinal bleed (melena). ...Read more

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What should I do if I get black stool?

Black stool: Can be caused by a bleeding source in your stomach. When the acid in stomach mixes with the blood it turns black and presents as black stool or melena. Pepto bismol (bismuth subsalicylate) has bismuth which also turns the stools black. If not using pepto, you need to see a GI doctor for diagnosis and treatment. Don't wait til it appears as fresh blood in the stool as that indicates more rapid and severe bleeding. ...Read more

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What doea greasy jet black stool mean?

What doea greasy jet black stool mean?

Dark-colored stool: Dark-colored stools may result from iron supplements, foods you eat (like a lot of spinach), substances (like peptobismol), but most significantly suggests bleeding. When blood is denatured by acid in your stomach, as from ulcers, stools will turn tarry ("melena"). Blood may also be ingested from nose bleeds, bleeding gums. Silver-colored stool suggests bleeding from the biliary tree. Get checked. ...Read more

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What could it mean when you have black stool?

What could it mean when you have black stool?

Black stools could: Be related to medicines/ vitamins such as peptobismol or iron. However, black, tarry, malodorous stools are like melena (gi bleeding). This would warrant medical evaluation. ...Read more

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Dark brown, but not black stool. What could it be?

Dark brown, but not black stool. What could it be?

What you ate?: Color of stools varies widely, and reflects mostly what you've eaten as well as some medications. Generally not a reliable sign of anything, but any color can contain hidden blood, so if you're worried, your physician can do a simple hemoccult for hidden blood in the office. ...Read more

Dr. Katharine Cox
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


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