Small intestinal bacterial overgrowth (SIBO) can be a complication of IBS, with up to 78% of people with IBS also receiving an SIBO diagnosis. Rates of SIBO are lower in the general population, affecting 40% of people without IBS.

As its name suggests, SIBO primarily affects the small intestine. The small intestine is part of the digestive system and is responsible for breaking down food into nutrients the body needs to thrive. It also helps with waste disposal.

healthcare concept, intestines, SIBO

How We Help

SIBO is a collection of symptoms that occur due to bacterial overgrowth in the small intestine. The exact protocol depends on the type of SIBO but may include antibiotics, supplementation, or diet changes.

Are you tired of dealing with symptoms of an unhealthy digestive system? Revolution Gut Health’s services are exclusively for people who want to improve their gut health. Book a consultation today to learn more!

Disclaimer: The health information on this site is provided for general informational and education purposes only and is not a substitute for professional advice. Accordingly, before taking any actions based upon such information, we encourage you to consult with the appropriate professionals. The use or reliance of any information contained on this site is solely at your own discretion. Revolution Gut Health does not claim to heal, treat or cure any of the conditions mentioned.

What is Small Intestinal Bacterial Overgrowth (SIBO)

Small Intestinal Bacterial Overgrowth (SIBO) is a gastrointestinal disorder characterized by an abnormal increase in the number of bacteria in the small intestine. This condition can lead to various digestive symptoms and nutrient malabsorption.

fatigue, SIBO symptoms

SIBO Symptoms

As mentioned, SIBO (small intestinal bacterial overgrowth) affects the small intestinal microbiome. It occurs when too much bacteria invades the region.

The symptoms of SIBO can vary from mild to severe and often overlap with those of other gastrointestinal disorders. Common symptoms include excessive gas, diarrhea, and, in extreme cases, nutritional deficiencies. Other signs of SIBO include:

  • Abdominal pain or discomfort
  • Bloating
  • Nausea
  • Indigestion
  • Weight loss
  • Fatigue

SIBO Stool

One way to identify SIBO is to look at someone’s stool. People with SIBO are often deficient in bile acids. Bile acids are responsible for breaking down and absorbing fat for use throughout the body.

When this process does not occur, it may result in an abnormally pale stool color. Other ways to identify SIBO in stool is the presence of bulk and/or an especially bad smell.

SIBO Tongue

Some people develop a white film on their tongues from SIBO. A white tongue often indicates an issue with the digestive system. The thicker the coating is, the bigger the problem.

However, a white tongue may also be a symptom of other conditions such as thrush, anemia, or scarlet fever. People who experience these symptoms should consult a doctor to discover the cause.

SIBO Constipation

While diarrhea is a common symptom of SIBO, constipation can also occur. Constipation may have a link to SIBO’s impact on certain types of methane-releasing small intestine bacteria.

Other experts believe this symptom may have more to do with SIBO’s connection to IBS. IBS stands for irritable bowel syndrome. One of the condition’s hallmark symptoms is alternating diarrhea and constipation.

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Causes of SIBO

Although SIBO can occur due to several underlying factors, the real cause of SIBO is a poorly functioning digestive system. We rely on our liver, kidneys, stomach acid, and mouth to maintain the correct ecological conditions for our microbes to develop in the correct types and amounts inside of us. If there is any issue with these functions, we see changes in the microbes that are living there.

Stress & Hypertoxicity

The two main reasons these organs stop working correctly? Stress & Hypertoxicity.

These conditions directly affect our autonomic nervous system and are related to the proper stimulation and functioning of the digestive tract, among multiple other important functions.

Stress and Hypertoxicity triggers multiple imbalances in the growth patterns of your small intestinal bacteria, driving all the symptoms known to be associated with SIBO. Knowing the root cause of the problem is fundamental for improving this condition efficiently and reducing the chances of it reoccuring.

Without using antibiotics, antimicrobials, or any other invasive type of treatment, we can help you improve this and many other conditions for good.

So far, experts are not entirely sure what causes SIBO, though genetics may play a role. Low levels of stomach acid, dysmotility, or an abnormally small intestine may also give rise to the above symptoms.

Further, overusing certain medications (e.g., antibiotics) could be to blame. Other risk factors for SIBO include aging, immune disorders, surgical interventions, and pre-existing GI issues, such as diabetes, IBS, and IBDs like Crohn’s.

What Are the Types of SIBO?

There are three types of SIBO: hydrogen SIBO, methane SIBO, and hydrogen sulfide SIBO. People can have only one type of SIBO, or they may have two or three at the same time.

Hydrogen SIBO

Bacteria in the gut and small intestines produce a lot of gas. One of them is hydrogen (H2). People with multiple types of SIBO with more symptoms attributable to hydrogen would have hydrogen-dominant SIBO.

Signs someone might have hydrogen or hydrogen-dominant SIBO include severe stomach bloating or discomfort and diarrhea. In extreme cases, people with this type of SIBO may experience dehydration or malnutrition.

Methane SIBO

Often, people who experience chronic constipation as a primary symptom have methane or methane-dominant SIBO.

This type of SIBO is unique because, unlike others, bacteria do not cause it. Instead, archaeans that are known as methanogens lead to symptoms like weight gain and a higher ratio of body fat. diarrhea is also possible, though less common.

Treating methane SIBO is not always easy. Antibiotics do not always work since they target bacteria, not archaea. Many people try antimicrobial supplements and/or diet changes instead.

Hydrogen Sulfide SIBO

Hydrogen sulfide SIBO is more similar to the hydrogen than methane type because the gas is produced by bacteria, not archaea. This type leads to typical SIBO symptoms, including diarrhea, stomach pain, and excessive gas.

However, if left unchecked, hydrogen sulfide SIBO can also impact the nervous system. Hydrogen sulfide is a neurotoxin in large amounts. As such, it may cause tingling in the hands or feet and sensitivity to light or sound.

The best treatment for this type of SIBO is to reduce sulfur intake. The goal is to prevent the production of hydrogen sulfide gas. So, people with hydrogen sulfide SIBO should limit their consumption of sulfur-containing foods.

SIBO Testing

There are currently three tests available to identify SIBO. They include:

Small Intestine Aspiration and Quantitative Cultures

Small intestine aspiration and quantitative cultures involve taking a bacterial sample from the small intestine. This test is ideal for diagnosing SIBO because it takes place in a lab setting.


However, this SIBO test is not always accurate and can be cost-prohibitive for some people. Getting a urinalysis is much simpler and more affordable, but it also has drawbacks in that the test results can be skewed.

Breath Testing

A breath test is the easiest and most affordable way to find out if someone has SIBO. These tests are available in a lab, or someone can take one at home. The lab-administered tests are pricier but offer more accurate results.

This option comes in two varieties: glucose and lactulose breath tests. Some experts prefer lactulose SIBO breath testing because it may provide more accurate results.

SIBO Treatment

The best line of defense against SIBO is to treat the underlying cause. For example, say someone’s symptoms are caused by low stomach acid. In that case, hydrochloric acid or vitamin B12 supplements may help.

Otherwise, antibiotics and fecal microbiota transplants (FMTs) are the most common treatments for SIBO. The antibiotic rifaximin works best for hydrogen-dominant SIBO, while neomycin is ideal for methane-dominant SIBO.

FMTs are newer treatments and should be used with caution. Some clinical reports have seen improvements in SIBO from FMT. Others have found the exact opposite: FMT may increase the risk of SIBO.

SIBO Natural Treatment

Many people with SIBO want to avoid medications. The good news is that some natural supplements can help with SIBO symptoms. Most commonly, people with SIBO use supplements containing the following ingredients:

  • Berberines like philodendron, goldenseal, or barberry
  • Polyphenols like propolis, cloves, and oregano leaf
  • Herbaceous extracts like oregano, thyme, or peppermint oil

Other natural ingredients to try are neem and allicin. Neem is a type of tree that produces beneficial fruit, seeds, leaves, stems, and bark. Allicin is a compound found in common household garlic that has antimicrobial effects.

oregano and thyme for SIBO treatment
muscle ache

SIBO Die-Off Symptoms

Treating SIBO is a lot like incorporating a new skincare ingredient. Sometimes, symptoms worsen before they get better. A flare-up of SIBO symptoms after starting a new treatment regimen is also known as the die-off reaction.

Experts refer to this phenomenon as a ‘die-off’ because symptoms occur due to dying bacteria. As bad or excessive bacteria decay, they let off gasses and other toxins, which may lead to the following SIBO die-off symptoms:

  • Bloating
  • Stomach pain or discomfort
  • Fatigue
  • Muscle aches
  • Fever

The good news about these symptoms is that they will go away eventually. In the meantime, it is crucial to stick to the treatment despite these uncomfortable side effects.

Diet for SIBO

It was mentioned earlier that certain dietary changes may help with SIBO symptoms. For instance, readers may recall that sulfur-dominant SIBO can benefit from a diet lower in sulfur-containing foods. That is not the only type of diet that may help with SIBO. Other diets for people with SIBO include:

The Low FODMAP Diet: Requires cutting out or reducing consumption of high-FODMAP foods like dairy, wheat, and certain fruits and veggies

The Specific Carbohydrate Diet: Requires restriction of grains and grain-based products, sugar, and lactose

The Low Fermentation Diet: Requires reducing consumption of whole grains and complex carbs

The Elemental Diet: Requires consumption of liquids only to reduce stress on the digestive system

healthy foods, SIBO diet

Of these, the Elemental Diet is the only option studied as a SIBO treatment. The other diets are better for symptom management.

The conclusion to take away here is that dietary changes may help with the symptoms or even the underlying causes of SIBO. However, more research is needed to understand which diet(s) is best and under what circumstances

Additional Resources

A Guide for SIBO Supplements

A Guide for SIBO Supplements

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SIBO Die-Off Symptoms

SIBO Die-Off Symptoms

Small intestinal bacterial overgrowth (SIBO) is a digestive condition featuring an overgrowth of gut microbes. It can greatly affect someone's quality of life and lead to mental health conditions like anxiety and depression. Symptom management is...

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SIBO Treatment Without Antibiotics

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Different Types of SIBO

Different Types of SIBO

People who regularly suffer from symptoms like diarrhea or constipation may have SIBO. This condition is present in nearly 34% of people with digestive complaints who undergo a breath test. SIBO symptoms can be uncomfortable at best and impact...

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Fasting for SIBO

Fasting for SIBO

Living inside the human gut are hundreds of trillions of microbes, including bacteria, archaea, viruses, and other microscopic life forms. That might sound scary, but these microbes are crucial for our health. We are in good shape so long as the...

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Probiotics for SIBO

Probiotics for SIBO

The conversation around small intestinal bacterial overgrowth (SIBO) and the role of probiotics is gaining considerable traction. If you're researching probiotics for SIBO, you've probably come across the same articles explaining what probiotics...

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