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What Are the Causes of Foul-Smelling Diarrhea?

by
author image Lidia Tomulet
Lidia Tomulet has been a writer since 2008, covering subjects related to natural children's health, homeopathy, nutrition and lifestyle. She contributes her expertise in the areas of alternative and holistic medicine to various websites. Tomulet holds a Bachelor of Arts in psychology from Southern Methodist University and a naturopathic doctorate from the National College of Natural Medicine in Portland, Ore.
What Are the Causes of Foul-Smelling Diarrhea?
A toilet with the lid up. Photo Credit serezniy/iStock/Getty Images

Overview

While no diarrhea smells good, diarrhea that has an unusually foul smell can be an indicator of an underlying health problem. Antibiotic treatment for other problems is a common cause of foul-smelling diarrhea, but intestinal infections, impaired absorption and inflammatory bowel disease can also result in foul-smelling liquid stool. If your diarrhea doesn’t resolve within a few days, consult a physician for accurate diagnosis and appropriate treatment.

Antibiotic Colitis

Antibiotic use can create an unhealthy shift in the balance of normally occurring intestinal flora. This can make the gastrointestinal system vulnerable to an overgrowth of Clostridium difficile, an anaerobic bacteria. Acute inflammation of the colon and diarrhea are caused by certain toxins produced by the bacteria. Treatment with cephalosporins, clindamycin or broad-spectrum penicillins is usually responsible, but any antibiotic can disrupt your natural gut flora. Taking probiotics during and after antibiotic treatment can help keep your intestinal flora healthy and able to resist Clostridium difficile and other opportunistic infections.

Intestinal Infection

Commonly referred to as gastroenteritis, intestinal infections can cause foul-smelling diarrhea. Intestinal infections are caused by viruses, bacteria or parasites. Some of the most common organisms responsible for foul-smelling diarrhea include Escherichia coli, Salmonella, Shigella, rotavirus, Norwalk virus and Giardia. You can become infected by ingesting contaminated food or water or by being in contact with another infected person.

Malabsorption

Impaired absorption of nutrients from the small intestine is also called malabsorption. Several conditions are known to cause malabsorption, including celiac disease, short bowel syndrome, tropical sprue, whipple's disease, carbohydrate intolerance and gastrointestinal infection. One of the symptoms of malabsorption is foul-smelling diarrhea. A doctor can examine you and run specific tests to identify the cause of the malabsorption and diarrhea.

Inflammatory Bowel Disease

Inflammatory bowel disease, IBD, is characterized by chronic inflammation of the gastrointestinal tract. Two different conditions, Crohn's disease and ulcerative colitis, comprise the spectrum of IBD. While they are distinct conditions with different symptoms, either one may cause foul-smelling diarrhea. Rectal bleeding is also common, especially in ulcerative colitis. Imaging and sigmoidoscopy are usually required for accurate diagnosis and treatment.

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