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causes of black stool in adults

A 55-year-old member asked:
Dr. Barry Marged
43 years experience Family Medicine
Blood: 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 in ... Read More
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A 41-year-old member asked:
Dr. Heidi Fowler
24 years experience Psychiatry
Sometimes it is: caused by things like iron supplementation or Peptobismal. If there is black, tarry malodorous stool it could be GI bleeding and should prompt medical ... Read More
A 50-year-old member asked:
Dr. Charles Cattano
38 years experience Gastroenterology
Melena ?: Dark-colored stools may result from iron supplements, foods you eat (like a lot of spinach), substances (like peptobismol), but most significantly sug ... Read More
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A 39-year-old member asked:
Dr. Heidi Fowler
24 years experience Psychiatry
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 gastroint ... Read More
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A 48-year-old male asked:
Dr. David Ziring
21 years experience Pediatric Gastroenterology
Stool appearance: The color of one's stools often has little significance. The exception is that of having dark, nearly black colored stools. Bleeding in the upper GI ... Read More
A 46-year-old member asked:
Dr. Elie Schochet
17 years experience Colon and Rectal Surgery
Rare: In this age group, bright bleeding with boowel movements is almost always ourtlet type from an anal cause such as hemorrhoids or anal fissure. Brisk d ... Read More
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A 37-year-old member asked:
Dr. Charles Cattano
38 years experience Gastroenterology
Not always diarrhea: Stool texture (regardless of volume or frequency of movements) is defined by the bristol stool scale (bss), which ranges from 1 (hard, pellet stool) t ... Read More
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A 22-year-old female asked:
Dr. Lynne Weixel
35 years experience Clinical Psychology
IBS & dietary : Imbalances (too much fermentation created gas) in diet and ibs in general can do that. Lactose intolerant people might see that. I don't know if it is ... Read More
A 41-year-old member asked:
Dr. Robert Alexander
26 years experience Plastic Surgery
Often Hemorrhoids: If blood is bright red (like a clot), it often is caused by hemorrhoids or straining to have a bowel movement. Small veins on the inside and near out ... Read More
A 37-year-old male asked:
Dr. Scot Lewey
36 years experience Gastroenterology
Bile: Bile secreted by the liver and reabsorbed in intestine to be recycled through the liver is the chief contributing factor to green color of stool. Havi ... Read More
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A 27-year-old male asked:
Dr. Charles Cattano
38 years experience Gastroenterology
Seeds, blood...: Dark-colored stools may result from iron supplements, foods you eat (like a lot of spinach), substances (like peptobismol), but most significantly sug ... Read More
A 56-year-old member asked:
Dr. Heidi Fowler
24 years experience Psychiatry
White specks: I can’t diagnose the reason for the white spots in your stool. Possible causes can be increased mucus in the stool because of irritation of the gastro ... Read More
A 36-year-old male asked:
Dr. Arnold Malerman
52 years experience Orthodontics
Many possibilities: Could be cavities, baby bottle syndrome, stain from pigmented foods, poor oral hygiene. 1st dental appointment should be at age 1. If your child has n ... Read More
A 40-year-old member asked:
Dr. Keith Ramsey
35 years experience Adolescent Medicine
Food: The stool color is determined by the germs that live in the intestine and the foods and colors eaten. Gray is ok.
A 10-year-old female asked:
Dr. Natalie Geary
29 years experience Pediatrics
Multiple: Many times if the child is constipated there will be a bit of blood from an anal fissure ( cut) . Sometimes it may mean some viral infection. Sometime ... Read More
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A 54-year-old member asked:
Dr. Kathleen Berchelmann
17 years experience Pediatrics
GI infections: Gi infections, such as girardia, can cause poor absorption of nutrients, resulting in fat in the stool.
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A female asked:
Dr. William Harris
32 years experience Family Medicine
Ulcers: Bright red blood in the stool is from hemorrhoids. Black stool is digested blood from stomach ulcers. These can be treated with Prilosec and supposito ... Read More
A 27-year-old female asked:
Dr. Charles Cattano
38 years experience Gastroenterology
Good possibilities: Mucus discharge occurs in up to 50% of patients with irritable bowel syndrome, with or without pain. Mucus may also be produced in response to partial ... Read More
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A 40-year-old member asked:
Dr. Charles Cattano
38 years experience Gastroenterology
Change in bowels: The amount, color, frequency of stool varies with foods, speed of emptying of the GI tract, medications & supplements ingested, gut flora (unique for ... Read More
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A 28-year-old male asked:
Dr. Charles Cattano
38 years experience Gastroenterology
Here's a link...: http://www.uptodate.com/contents/evaluation-of-occult-gastrointestinal-bleeding
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A 42-year-old female asked:
Dr. Sean O Donovan
33 years experience Colon and Rectal Surgery
Inadequate chewing?: Many foodstuffs, especially vegetable matter may appear to be relatively undigested and recognizable in stool -- corn is a common sighting. Adequate m ... Read More
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A 45-year-old member asked:
Dr. Arnold Malerman
52 years experience Orthodontics
Genetics: You inherit tooth size and jaw size from your ancestors. They don't always match. Your dentist can help. Call for an appointment.
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A 54-year-old male asked:
Dr. Scot Lewey
36 years experience Gastroenterology
Colitis : Pus cells or fecal white blood cells or leukocytes indicate inflammatory process in the bowel. Broadly there are two main causes; infectious and nonin ... Read More
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A 54-year-old member asked:
Dr. Vivek Huilgol
34 years experience Gastroenterology
Something bad: Bloody diarrhea warrants investigation now. There are no 'good causes' of this...Seek help from your doctor now.
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90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more. Get help now:

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Personalized answers
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