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Fecal Odor: Causes, Diagnosis and Treatment

Fecal odor refers to a characteristic foul, stool-like body or breath odor that may indicate metabolic disorders, intestinal diseases, or bacterial overgrowth.

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Things worth knowing about "Fecal odor"

Fecal odor refers to a characteristic foul, stool-like body or breath odor that may indicate metabolic disorders, intestinal diseases, or bacterial overgrowth.

What is Fecal Odor?

Fecal odor (also referred to as fecal body odor or fecal breath) describes an unpleasant, strong smell resembling stool or putrefaction emanating from the breath or body. In medicine, this type of odor is considered a clinical sign that may point to various underlying conditions affecting the digestive tract, liver, or metabolic system. It can manifest as foetor ex ore (bad breath of fecal quality) or as a general body odor and should always be evaluated by a healthcare professional.

Causes

Fecal odor can arise from a wide range of medical conditions. The most common include:

Intestinal obstruction or fistulas: In cases of ileus (bowel obstruction) or an abnormal connection (fistula) between the intestine and the stomach, digested intestinal contents can flow back into the upper digestive tract, producing a characteristic fecal breath odor.
Trimethylaminuria (fish odor syndrome): A metabolic disorder in which trimethylamine (TMA) is not adequately broken down by the liver, leading in some presentations to a putrid or fecal-like odor.
Small intestinal bacterial overgrowth (SIBO): Excessive proliferation of bacteria in the small intestine leads to abnormal fermentation and putrefaction of food components, generating unpleasant volatile compounds.
Severe liver disease: In cases of liver failure, a condition called foetor hepaticus can occur -- a sweet, musty-fecal breath odor caused by accumulated metabolic byproducts.
Inflammatory bowel disease (IBD): Crohn's disease or ulcerative colitis can cause fecal-smelling odor due to inflammation, infection, and fistula formation.
Dietary factors: Certain foods such as cabbage, garlic, onions, or high-protein diets can temporarily produce fecal-like volatile compounds in the body.
Poor oral hygiene and periodontitis: Bacterial decomposition processes in the mouth can release sulfur-containing and putrid compounds similar to fecal odor.

Symptoms and Associated Signs

Fecal odor rarely occurs in isolation. Common accompanying symptoms that may help identify the underlying cause include:

Bloating, abdominal cramps, and diarrhea
Nausea and vomiting (sometimes with fecal-smelling vomit)
Unintentional weight loss and malnutrition
Changes in bowel habits (constipation or diarrhea)
Yellowing of the skin or eyes (jaundice) in liver-related causes
Dry mouth and gum disease when the cause is oral

Diagnosis

Investigating fecal odor requires a thorough medical evaluation. Commonly used diagnostic approaches include:

Medical history and physical examination: Assessment of dietary habits, medications, pre-existing conditions, and associated symptoms.
Blood tests: Evaluation of liver enzymes, kidney function, and metabolic markers.
Breath tests: Hydrogen breath tests to detect small intestinal bacterial overgrowth.
Endoscopy: Direct visualization of the stomach and intestines to assess mucosal condition and rule out fistulas or obstructions.
Imaging: Ultrasound, CT scan, or MRI of the abdomen to detect organ abnormalities.
Urine and stool analysis: Detection of specific metabolic byproducts such as trimethylamine.

Treatment

Treatment is directed at the underlying cause of the fecal odor:

Bowel obstruction or fistulas: Surgical intervention is often required.
Bacterial overgrowth (SIBO): Antibiotic therapy (e.g., rifaximin) combined with dietary modification.
Liver disease: Treatment of the underlying condition, including medication or, in severe cases, liver transplantation.
Trimethylaminuria: Dietary adjustments (reducing intake of choline- and carnitine-rich foods) and supportive care.
Oral causes: Professional dental cleaning, improved oral hygiene, and treatment of periodontal disease.
Dietary factors: Adjusting food intake, ensuring adequate hydration, and using probiotics to support a healthy gut microbiome.

When to See a Doctor

Persistent or sudden onset fecal odor, especially when accompanied by abdominal pain, vomiting, unintentional weight loss, or jaundice, should be evaluated by a doctor promptly. Even when the odor significantly impacts quality of life without obvious associated symptoms, a professional diagnosis is recommended.

References

Longo, D.L. et al. - Harrison's Principles of Internal Medicine, 21st Edition. McGraw-Hill, 2022.
Pimentel, M. et al. - ACG Clinical Guideline: Small Intestinal Bacterial Overgrowth. American Journal of Gastroenterology, 2020. Available at: https://journals.lww.com/ajg
World Gastroenterology Organisation (WGO) - Global Guidelines: Small Intestinal Bacterial Overgrowth (SIBO). WGO, 2020. Available at: https://www.worldgastroenterology.org

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