- With Mayo Clinic gastroenterologist
Michael F. Picco, M.D.
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Michael F. Picco, M.D.
Michael F. Picco, M.D.
Dr. Michael Picco has been with Mayo Clinic since 1999. He is board certified in internal medicine and gastroenterology. Dr. Picco is an assistant professor of medicine at College of Medicine, Mayo Clinic, and a consultant in gastroenterology at Mayo Clinic in Florida.
He has authored numerous publications in the area of gastroenterology, including original research, editorials and textbook chapters. He works with a team of gastroenterologists that takes care of complex gastrointestinal conditions and has a particular interest in diarrheal illnesses and inflammatory bowel diseases (ulcerative colitis and Crohn's disease). He is also active in medical education in training new gastroenterologist and internists.
"Mayo Clinic's website is an invaluable resource for patients and their families," Dr. Picco said. "Informed patients are better able to participate in their own health care. A patient's participation is vital to the treatment of his or her disease. I hope to assist in helping patients understand their digestive problems and current treatments that are offered. This will allow for better communication between patients, their physicians and other health care professionals."
Dr. Picco serves as a reviewer of new research for several medical journals in the area of gastroenterology and is an active member of the American Gastroenterological Association, American College of Gastroenterology and the Crohn's & Colitis Foundation of America. He serves on numerous committees that address physician training, research and clinical practice in gastroenterology, both at Mayo Clinic and at the national level.
"Patients need to know about their disease, what to expect, the latest treatments and side effects so that they can make informed decisions about their health care. Gastrointestinal disease affects not only patients but also their families. My goal is to assure that our website provides accurate, reliable information and resources for patients. We must always provide the latest, most cutting-edge information to assist patients in dealing with their medical problems," Dr. Picco said.
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Question
Stool color: When to worry
Yesterday, my stool color was bright green. Should I be concerned?
Answer
from Michael F. Picco, M.D.
Stool comes in a range of colors. All shades of brown and even green are considered normal. Only rarely does stool color indicate a potentially serious intestinal condition.
Stool color is generally influenced by what you eat as well as by the amount of bile — a yellow-green fluid that digests fats — in your stool. As bile pigments travel through your gastrointestinal tract, they are chemically altered by enzymes — changing the pigments from green to brown.
Consult your doctor if you're concerned about your stool color. If your stool is bright red or black — which may indicate the presence of blood — seek prompt medical attention.
| Stool color | What it may mean | Possible dietary causes |
|---|---|---|
| Green | Food may be moving through the large intestine too quickly, such as due to diarrhea. As a result, bile doesn't have time to break down completely. | Green leafy vegetables, green food coloring, such as in flavored drink mixes or ice pops, iron supplements. |
| Light-colored, white or clay-colored | A lack of bile in stool. This may indicate a bile duct obstruction. | Certain medications, such as large doses of bismuth subsalicylate (Kaopectate, Pepto-Bismol) and other anti-diarrheal drugs. |
| Yellow, greasy, foul-smelling | Excess fat in the stool, such as due to a malabsorption disorder, for example, celiac disease. | Sometimes the protein gluten, such as in breads and cereals. But see a doctor for evaluation. |
| Black | Bleeding in the upper gastrointestinal tract, such as the stomach. | Iron supplements, bismuth subsalicylate (Kaopectate, Pepto-Bismol), black licorice. |
| Bright red | Bleeding in the lower intestinal tract, such as the large intestine or rectum, often from hemorrhoids. | Red food coloring, beets, cranberries, tomato juice or soup, red gelatin or drink mixes. |
- LeBlond RF, ed., et al. DeGowin's Diagnostic Examination. 9th ed. New York, N.Y.: The McGraw-Hill Companies; 2009. http://www.accessmedicine.com/resourceTOC.aspx?resourceID=534. Accessed July 31, 2012.
- Feldman M, et al. Sleisenger & Fordtran's Gastrointestinal and Liver Disease: Pathophysiology, Diagnosis, Management. 9th ed. Philadelphia, Pa.: Saunders Elsevier; 2010. http://www.mdconsult.com/books/about.do?eid=4-u1.0-B978-1-4160-6189-2..X0001-7--TOP&isbn=978-1-4160-6189-2&about=true&uniqId=229935664-2192. Accessed July 31, 2012.
- Longo DL, et al. Harrison's Online.18th ed. New York, N.Y.: The McGraw-Hill Companies; 2012. http://www.accessmedicine.com/resourceTOC.aspx?resourceID=4. Accessed Aug. 8, 2012.
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