Brenda Khan
While diet is the most common cause of bad-smelling stool, there are other factors that can cause an abnormal stool odor. This can include underlying medical conditions, such as celiac disease, Crohn's disease, cystic fibrosis, and intestinal infections. In some cases, abnormal stool odor can be caused by viral, parasitic, or bacterial infections, such as Salmonella, Clostridium difficile, and Giardia. Additionally, certain medications and supplements can also contribute to abnormal stool odor. It is important to note that persistent foul-smelling stools may indicate a serious health concern, and seeking medical advice is recommended if the issue persists or is accompanied by other symptoms.
| Characteristics | Values |
|---|---|
| Medical conditions | Infections, allergies, colitis, lactose intolerance, inflammatory bowel disease, celiac disease, cystic fibrosis, intestinal infections, malabsorption disorders, inherited medical conditions, Crohn's disease |
| Other causes | Diet, medications, constipation, dehydration, gut conditions, antibiotics, blood in stool |
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What You'll Learn
Intestinal infections
Viral infections, such as gastroenteritis, and bacterial infections, such as E. coli, can also lead to foul-smelling stools. These infections can cause digestive issues and result in abnormal stool odour. In addition to these specific infections, any condition that affects the intestines can potentially cause foul-smelling stools. For example, ulcerative colitis, a type of inflammatory bowel disease (IBD), involves inflammation and ulcer formation in the colon. This condition can lead to bad-smelling stool with blood or mucus.
Crohn's disease is another type of IBD that can cause persistent and bad-smelling diarrhea. It can affect any part of the gastrointestinal tract, from the mouth to the rectum. Infections that disrupt the balance of gut bacteria, such as those that occur when taking antibiotics, can also lead to temporary smelly stool. Antibiotics can destroy good gut bacteria, allowing harmful bacteria to multiply and cause infections, resulting in foul-smelling stools.
Malabsorption issues, where the body struggles to absorb nutrients properly, can also contribute to foul-smelling stools. This can occur due to conditions like lactose intolerance, where the body cannot properly digest lactose, a sugar found in dairy products. Intestinal infections or conditions that affect the small intestine lining can lead to malabsorption and, consequently, unpleasant-smelling stool.
If you are experiencing foul-smelling stools, it is important to consult a healthcare professional. They can advise you on the necessary tests and treatments to address any underlying health issues.
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Medication
Some medications can cause constipation, which can lead to a more intense stool odor. This is because the longer stool sits in the colon without being eliminated, the more time there is for bacteria to create smelly substances as they digest the food.
Some medications can also contain added sulfites, which can lead to an excess of sulfur in the digestive system. Sulfur produces a strong-smelling gas, and sulfur odors are often associated with foul-smelling stools.
It is important to note that foul-smelling stools can be a symptom of a more serious health condition, so if the problem persists, it is recommended to seek medical advice.
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Organ dysfunction
For example, the liver normally breaks down odorous substances, eliminating their smell. If the liver is not functioning properly, these substances may not be broken down effectively, leading to an abnormal stool odour. Similarly, the kidneys are responsible for removing waste products and toxins from the body. If they are not functioning optimally, there may be a buildup of these substances, which can contribute to foul-smelling stools.
In addition, the pancreas plays a crucial role in digestion by producing enzymes that aid in the breakdown of food. Conditions such as chronic pancreatitis can lead to the permanent breakdown of the pancreas's structure and function. This can result in insufficient enzyme production, affecting the digestion process and potentially contributing to abnormal stool odour.
Another example is intestinal infections, such as Clostridium difficile (C. diff), which can cause foul-smelling stools. While antibiotics are used to treat bacterial infections, they can also disrupt the balance of gut bacteria, leading to a temporary increase in smelly stool. Additionally, certain conditions, such as malabsorption syndrome, can affect the small intestine's ability to absorb nutrients properly, resulting in foul-smelling stools.
It is important to note that foul-smelling stools can be a symptom of a more serious health condition. If the odour persists or is accompanied by other symptoms such as diarrhoea, abdominal pain, or bloody stools, it is recommended to seek medical advice.
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Food intolerances
Lactose intolerance can be diagnosed through a stool test, a hydrogen breath test, a genetic test, or a skin-prick test. Over-the-counter (OTC) lactase enzymes can be used to aid in the digestion of lactose.
Another example of a food intolerance that can cause foul-smelling stools is celiac disease, an autoimmune disorder triggered by the consumption of gluten. Celiac disease can be diagnosed through a blood test, and treatment typically involves adopting a gluten-free diet.
It is important to note that food intolerances are distinct from food allergies, which can also cause foul-smelling stools. Food allergies involve an overactive immune response to certain foods, which can lead to symptoms such as hives, rashes, and swelling of the lips, tongue, and throat. In some cases, a food allergy may cause anaphylaxis, a rare but potentially life-threatening reaction.
If you suspect that you have a food intolerance or allergy, it is recommended to consult a healthcare professional for proper diagnosis and guidance on managing your condition.
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Underlying health conditions
While stool normally has an unpleasant odour, certain underlying health conditions can cause an abnormal stool odour.
Infections
Viral, bacterial, and parasitic infections can affect digestion and cause foul-smelling stools. Examples include Salmonella, Giardia, Clostridium difficile, and E. coli. Infections can also cause foul-smelling stools with a greasy appearance and diarrhoea.
Allergies and Food Intolerances
Food allergies or intolerances can cause abnormal stool odour. Lactose intolerance, in particular, can lead to smelly stools. A hydrogen breath test can be performed to diagnose lactose intolerance by measuring the amount of methane or hydrogen gas in the breath.
Inflammatory Disorders
Foul-smelling stools can be a symptom of inflammatory bowel diseases (IBD) such as inflammatory bowel syndrome (IBS) and inflammatory bowel disease (IBD). A low FODMAP diet may be helpful in managing IBD.
Malabsorption Disorders
Malabsorption disorders, such as celiac disease, occur when the body does not absorb nutrients from food efficiently. Celiac disease is a severe sensitivity to gluten found in wheat and other grains. A gluten-containing diet should be maintained before testing for celiac disease to ensure accurate diagnosis.
Inherited Medical Conditions
Certain inherited medical conditions, such as cystic fibrosis, can also cause foul-smelling stools.
If you are experiencing abnormal stool odour, it is important to consult a healthcare professional for a correct diagnosis and appropriate treatment.
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Frequently asked questions
Foul-smelling stools can be caused by viral, bacterial, or parasitic infections, such as Salmonella, Clostridium difficile, or Giardia. They can also be caused by underlying health conditions, such as inflammatory bowel disease (IBD), lactose intolerance, or gluten-related diseases.
Foul-smelling stools can be accompanied by other symptoms, such as blood in the stool, unusual stool colour, or fever. These symptoms may indicate a serious health condition and should be evaluated by a medical professional.
It is recommended to keep a food journal to identify any new or regular foods that may be causing the odour. If no correlation is found, it is advised to eliminate lactose and sugar substitutes from the diet. If the issue persists, it may be time to seek medical care.
Yes, a healthcare practitioner may perform a stool test to check for blood, bacteria, viruses, or acidity related to lactose intolerance. They may also recommend a blood test to check for anaemia, dehydration, malnutrition, or infection. Other diagnostic tests include the hydrogen breath test, celiac disease blood test, genetic test, and skin-prick test.
It is important to identify and address the underlying cause of foul-smelling stools. This may involve dietary changes, such as increasing water intake, incorporating probiotics, or following a specific diet recommended by your doctor. In some cases, medical intervention, such as surgery, medication, or lifelong dietary changes, may be necessary.
