SIBO and Bloating: What’s Happening and How It Shows Up

Bloating that does not resolve with dietary changes alone may be more than a simple food-sensitivity issue. Small intestinal bacterial overgrowth, commonly known as SIBO, is one frequently overlooked possibility.

Maybe you have eliminated gluten, dairy, beans, onions, garlic, and half the produce section. You may have tried probiotics, digestive enzymes, herbal teas, and a low-FODMAP diet. Perhaps these changes helped temporarily, but the bloating returned as soon as you expanded your diet.

Or maybe nothing helped at all.

At that point, the problem is not necessarily that you have failed to find the right diet. It may be that the underlying reason for your symptoms has not been identified.

SIBO occurs when excessive bacteria—or an abnormal mix of bacteria—are present in the small intestine and contribute to digestive symptoms. It can affect people at different ages and stages of life, but the factors driving it may look very different in a college student, a pregnant individual, or someone navigating perimenopause.

This guide explains what SIBO is, why it causes bloating, how qualified providers test and treat it, and why addressing motility and other underlying contributors is essential for preventing recurrence.

Understanding the connection between SIBO and bloating is essential for effective treatment and management of symptoms.

At Functional Nutrition Rx, we commonly see clients who have struggled with chronic bloating, abdominal distension, gas, constipation, diarrhea, or alternating bowel habits for months or even years. Many have previously been diagnosed with IBS and have tried multiple approaches, including low-FODMAP diets, elimination diets, probiotics, digestive enzymes, herbal antimicrobials, or repeated courses of antibiotics, often with only temporary relief.

SIBO requires appropriate testing, diagnosis, and medical oversight. Digestive symptoms can overlap with many other conditions, so symptoms alone are not enough to diagnose bacterial overgrowth.

This article is educational and does not replace individualized medical or nutrition care.

What Is SIBO and Why Does It Cause Bloating? Learn About SIBO and Bloating

SIBO stands for small intestinal bacterial overgrowth.

Your entire digestive tract contains microorganisms, but the number and type vary by location. The large intestine contains a dense microbial community. The small intestine normally has a much lower bacterial concentration because stomach acid, bile, digestive enzymes, intestinal movement, and the muscular valve separating the small and large intestine help control bacterial growth.

SIBO develops when the amount or type of bacteria in the small intestine becomes abnormal and begins contributing to symptoms.

The small intestine is where most nutrient digestion and absorption take place. When excessive bacteria are present, they can ferment carbohydrates before digestion and absorption are complete.

This fermentation produces gases and other compounds that may lead to:

• Abdominal bloating
• Visible distention
• Excess gas or belching
• Abdominal pressure or pain
• Diarrhea
• Constipation
• Nausea
• Early fullness
• Changes in stool consistency
• Food-related discomfort

In more significant cases, SIBO may interfere with normal nutrient absorption. This can contribute to weight loss or deficiencies in vitamin B12, iron, or fat-soluble vitamins. These complications do not occur in every person.

Why does SIBO make your stomach look swollen?

Bloating and distention are related but not identical.

Bloating describes the sensation of pressure, fullness, or trapped gas. Distention is the visible expansion of the abdomen.

Gas can contribute to bloating and distention, but it is not the only cause. Constipation, altered intestinal motility, visceral hypersensitivity, pelvic-floor dysfunction, and the abdominal wall’s response to pressure can also affect how bloated a person feels or appears.

Many clients describe waking with a relatively flat stomach and looking several months pregnant by the end of the day. Others experience upper-abdominal pressure, painful trapped gas, bloating immediately after meals, or symptoms that worsen as the week progresses. These patterns can provide useful clues, but they are not specific to SIBO. Similar symptoms can occur with IBS, constipation, celiac disease, lactose intolerance, gastroparesis, pelvic-floor dysfunction, ovarian conditions, endometriosis, or other digestive disorders.

What are the different SIBO gas patterns?

You may hear SIBO categorized as hydrogen-dominant, methane-dominant, or hydrogen sulfide-dominant. These patterns can be associated with different symptoms, but they do not predict symptoms perfectly.

Hydrogen-predominant SIBO

Hydrogen-predominant SIBO is often associated with:

• Loose stools
• Diarrhea
• Urgency
• Gas
• Bloating
• Abdominal discomfort

However, not every person with elevated hydrogen has diarrhea.

According to the North American Consensus and the American College of Gastroenterology, an increase in hydrogen of at least 20 parts per million above baseline within 90 minutes of drinking glucose or lactulose is generally considered supportive of SIBO.

Methane-positive overgrowth

What was once called “methane-dominant SIBO” is now more accurately described as intestinal methanogen overgrowth, or IMO.

This distinction matters because methane is produced by microorganisms called archaea rather than bacteria. Methanogens can also be present in both the small and large intestine.

Methane is strongly associated with slower intestinal transit and constipation. People may report:

• Infrequent bowel movements
• Hard stools
• Straining
• Incomplete evacuation
• Significant bloating
• Abdominal pressure

A methane level of at least 10 parts per million at any point during breath testing is generally considered positive.  Methane overgrowth has a higher reoccurrence rate than hydrogen dominate overgrowth, which is why determining the root cause is very important.

Hydrogen sulfide-associated overgrowth

Some newer three-gas breath tests measure hydrogen sulfide. Elevated hydrogen sulfide has been associated with:

• Diarrhea
• Urgency
• Abdominal pain
• Bloating
• Increased sensitivity to certain sulfur-containing foods

Hydrogen sulfide testing is newer, and its diagnostic criteria are not yet as standardized as hydrogen and methane criteria. It should not be diagnosed from symptoms, stool odor, or gas odor alone.

It is important to note that many times, both hydrogen and methane gases are present and treatment involves eradicating both gasses.

How Is SIBO Diagnosed and What Does Treatment Involve?

SIBO cannot be reliably diagnosed from symptoms alone.

The most commonly used noninvasive option is a glucose or lactulose breath test. After following specific preparation instructions, the person drinks a measured amount of glucose or lactulose. Breath samples are then collected at regular intervals.

Standard breath testing measures:

• Hydrogen
• Methane

Some newer tests also measure hydrogen sulfide.

Glucose versus lactulose breath testing

Glucose and lactulose each have benefits and limitations.

Glucose is absorbed relatively early in the small intestine. This may make it less likely to produce a false-positive result from fermentation in the colon, but it may miss overgrowth located farther down the small intestine.

Lactulose travels through the entire small intestine and reaches the colon. This may help identify overgrowth in more distant sections, but rapid intestinal transit can make it difficult to determine whether early gas production occurred in the small intestine or after the lactulose reached the colon.

Breath testing is useful, but it is not perfect. Results may be affected by:

• Improper test preparation
• Recent antibiotic use
• Laxatives
• Probiotics
• Smoking
• What was eaten the previous day
• Slow or rapid intestinal transit

Small-bowel aspiration and culture can measure microorganisms more directly, but it requires an endoscopic procedure and also has limitations related to sampling, contamination, and interpretation.

A qualified provider should interpret testing alongside symptoms, bowel patterns, medical history, medications, previous surgeries, and other potential causes of digestive symptoms.

Prescription antibiotics

Rifaximin is a minimally absorbed antibiotic commonly prescribed for SIBO, although SIBO treatment is an off-label use in the United States.

Other medications or combinations may be considered depending on:

• Whether hydrogen, methane, or both are elevated
• Constipation or diarrhea
• Previous treatment response
• Allergies
• Other medical conditions
• Current medications
• Pregnancy or breastfeeding status

Medication selection and dosing belong with the prescribing medical provider.

Herbal antimicrobial protocols

Herbal antimicrobial protocols can be used as part of an evidence-informed, integrative SIBO treatment plan. Depending on the person, they may be considered as an alternative to prescription antibiotics, or incorporated alongside medical treatment, dietary support, and strategies addressing motility and recurrence.

Research in this area is still developing, but several studies support a role for botanical protocols. Together, these studies suggest that herbal antimicrobials may have a meaningful role in SIBO care, especially when used within a comprehensive medical and nutrition plan.

The specific formula, gas pattern, dose, duration, medication list, medical history, and underlying cause all matter. Some commonly used botanicals can affect blood sugar, blood pressure, liver enzymes, pregnancy safety, or medication metabolism. Product quality and potency may also vary considerably.

At Functional Nutrition Rx, herbal protocols are used strategically and collaboratively when appropriate. We consider the breath-test pattern, symptoms, bowel function, prior treatment response, medication interactions, and suspected underlying drivers. We also establish a clear treatment period and follow-up plan rather than leaving clients on antimicrobial supplements indefinitely.

Elemental diets

A medically supervised elemental diet provides nutrients in a liquid form for a limited period. The formula is designed to be absorbed high in the digestive tract, leaving less material available for microbial fermentation farther down.

Clinical studies have reported improvements in symptoms and eradication of SIBO after exclusive elemental diets. However, this approach can be:

• Expensive
• Difficult to tolerate
• Socially isolating
• Inadequate if not prescribed correctly
• Psychologically risky for someone with restrictive eating patterns

An elemental diet is not appropriate for everyone, particularly someone with an active eating disorder or significant history of restrictive eating. It should be completed with medical and dietitian supervision.

Why treating the overgrowth is only one part of the plan

Reducing the microorganisms does not automatically correct the conditions that allowed them to accumulate.

Potential underlying contributors include:

• Impaired intestinal motility
• Chronic constipation
• Previous food poisoning or post-infectious IBS
• Diabetes-related nerve or motility changes
• Hypothyroidism
• Celiac disease
• Systemic sclerosis
• Adhesions, strictures, diverticula, or other anatomical changes
• Prior abdominal or intestinal surgery
• Gastroparesis
• Certain medications, including opioids
• Acid-suppressing medications
• Pelvic-floor dysfunction
• Inadequate intake or restrictive eating that contributes to slow motility

SIBO can recur when these factors remain unaddressed.

Studies show that positive glucose breath tests returned in approximately 13% of patients after three months, 28% after six months, and 44% after nine months following successful antibiotic treatment.

Recurrence does not mean the person failed or ate the wrong food. It may mean that the overgrowth was treated while the underlying motility, anatomical, medical, or medication-related contributor remained.

What is the dietitian’s role in SIBO treatment?

At Functional Nutrition Rx, we can provide at home breath tests to identify overgrowth and help manage symptoms and eradicate bacteria overgrowth.

We help with:

• Reviewing the symptom timeline
• Providing supplements like antimicrobials
• Identifying nutritional deficiencies
• Maintaining adequate energy and protein intake
• Modifying fermentable carbohydrates when appropriate
• Preventing unnecessary food restriction
• Supporting constipation or diarrhea management
• Guiding food reintroduction
• Reviewing supplements for duplication or interactions
• Supporting recovery after treatment
• Coordinating nutrition care with medical providers
• Identifying symptoms that require further medical evaluation

What Does SIBO Look Like in Your 20s?

SIBO is not limited to older adults.

Young adults can experience food poisoning, repeated antibiotic exposure, chronic constipation, abdominal surgery, endometriosis, high stress, and eating patterns that affect gastrointestinal motility.

Factors worth reviewing in this age group include:

• A history of gastrointestinal infection
• Frequent or repeated antibiotic use
• Acid-suppressing medications
• Chronic constipation
• High stress and disrupted sleep
• Inadequate calorie intake
• Skipping meals
• An eating-disorder or disordered-eating history
• Endometriosis or pelvic adhesions
• Symptoms suggesting celiac disease
• Changes that began after starting or changing a medication

Hormonal birth control frequently comes up in this conversation. Hormones can affect GI symptoms and bowel patterns. It remains appropriate to review whether symptoms changed after starting or changing it without assuming causation.

SIBO symptoms in young adults are often labeled as IBS, food intolerance, or anxiety. Stress and the gut–brain connection can absolutely influence motility, pain perception, and bowel habits. That does not mean persistent digestive symptoms are imaginary or that medical causes should be overlooked.

A young person who has been eliminating foods for years may arrive with two problems: unresolved digestive symptoms and an increasingly restrictive relationship with food. The solution is not always another elimination diet. Proper testing and treatment must happen alongside nutritional rehabilitation and careful food expansion.

What Does SIBO Look Like During Pregnancy?

Pregnancy changes gastrointestinal function.

Rising progesterone can slow small-bowel and colonic transit. Pregnancy may also bring changes in activity, hydration, food intake, iron supplementation, and pressure on the digestive tract.

This can contribute to:

• Constipation
• Gas
• Reflux
• Nausea
• Early fullness
• Abdominal pressure
• Bloating

Slower intestinal transit creates a biologically plausible environment for overgrowth, but direct research establishing pregnancy itself as a cause of SIBO is limited. This makes diagnosis more complicated. Symptoms of SIBO can overlap almost completely with common pregnancy-related GI changes.

Testing and treatment decisions during pregnancy require physician and obstetric oversight. Prescription antibiotics, botanical antimicrobials, supplements, and highly restrictive diets should not be started independently.

A dietitian’s role is supportive and may include:

• Maintaining adequate calories and protein
• Supporting appropriate pregnancy weight gain
• Preventing nutritional deficiencies
• Adjusting fiber type and amount
• Supporting hydration and bowel regularity
• Modifying meal size for nausea or early fullness
• Identifying foods that reduce symptoms without creating excessive restriction
• Reviewing prenatal vitamins and iron tolerance
• Coordinating with the obstetrician and gastroenterologist

We do not independently prescribe an antimicrobial protocol during pregnancy. During pregnancy, the goal is not to create the strictest possible SIBO diet. The goal is to manage symptoms while protecting the nutritional needs of both parent and baby.

What Does SIBO Look Like in Perimenopause?

Bloating is commonly reported during the menopause transition.

Fluctuating estrogen and progesterone may affect intestinal motility, visceral sensitivity, sleep, stress response, and symptom perception. Human research also suggests that the composition of the gut microbiome changes across menopause, although researchers have not identified one universal “perimenopause microbiome.”

Emerging research is also examining how the menopause transition may affect intestinal-barrier function. New or worsening bloating during midlife should not automatically be labeled SIBO—but it should not be dismissed as “just hormones,” either.

Conditions and changes that may converge during perimenopause include:

• New or worsening constipation
• IBS
• Hypothyroidism
• Medication changes
• Pelvic-floor dysfunction
• Endometriosis
• Fibroids or ovarian conditions
• Changes in sleep
• Increased stress
• Reduced physical activity
• Changes in food intake or alcohol use

The term “estrogen dominance” is often used in functional and integrative settings to describe symptoms attributed to estrogen being high relative to progesterone. It is not a standardized medical diagnosis, and it should not become a catch-all explanation for bloating, irregular cycles, breast tenderness, weight changes, or digestive symptoms.

A complete assessment may include cycle history, bowel patterns, thyroid function, medication use, gynecologic symptoms, diet, stress, sleep, and signs that warrant imaging or medical evaluation. Identifying SIBO in a perimenopausal women does not mean hormones are irrelevant. It means the treatment plan needs to account for several interconnected factors rather than blaming every symptom on one hormone.

What Does SIBO Look Like Alongside Other Conditions?

SIBO often occurs within a larger clinical picture. Conditions that alter anatomy, digestion, immune function, or gastrointestinal motility may create an environment in which overgrowth is more likely or more difficult to prevent.

SIBO and hypothyroidism

Low thyroid hormone can slow gastrointestinal movement. When transit slows, bacteria have more time to accumulate and ferment material within the small intestine. Research has found an association between overt hypothyroidism and positive SIBO breath testing. However, not everyone with hypothyroidism has SIBO, and not every case of bloating in someone with Hashimoto’s is caused by bacterial overgrowth.

If thyroid function, constipation, or medication absorption remains unstable, treating the overgrowth alone may not prevent recurrence.

SIBO and celiac disease

Celiac disease and SIBO can produce overlapping symptoms, including:

• Bloating
• Diarrhea
• Abdominal pain
• Weight loss
• Fatigue
• Iron or vitamin deficiencies

SIBO may be considered when someone with confirmed celiac disease continues to experience symptoms despite following a gluten-free diet. Other causes of persistent symptoms must also be evaluated, including ongoing gluten exposure, lactose intolerance, microscopic colitis, pancreatic insufficiency, IBS, and refractory celiac disease.

Do not remove gluten before completing celiac testing unless instructed by your medical provider. Avoiding gluten can interfere with blood-test and biopsy accuracy.

SIBO and Ehlers-Danlos syndrome

People with hypermobile Ehlers-Danlos syndrome commonly report constipation, reflux, nausea, abdominal pain, and disorders of gut–brain interaction.

Connective-tissue differences, autonomic dysfunction, and altered motility may contribute to digestive symptoms in some patients. However, this does not mean everyone with hEDS has SIBO. Some research has found relatively low rates of positive hydrogen breath testing in this population. Testing should be guided by symptoms and clinical history rather than ordered solely because someone has Ehlers-Danlos syndrome.

SIBO and POTS

The autonomic nervous system helps regulate heart rate, blood pressure, digestion, and intestinal movement. People with postural orthostatic tachycardia syndrome may experience:

• Nausea
• Early fullness
• Constipation
• Diarrhea
• Abdominal pain
• Difficulty maintaining adequate food or fluid intake

Some patients also have delayed gastric emptying or other motility abnormalities that could theoretically contribute to overgrowth. However, a direct SIBO–POTS relationship has not been firmly established.

Treatment must account for the person’s hydration, sodium requirements, meal size, blood-pressure symptoms, bowel function, medications, and ability to meet nutritional needs.

Why the underlying condition changes the plan

When SIBO occurs alongside another condition, simply repeating antimicrobial treatment may provide only temporary relief.

Long-term management may require:

• Improving constipation
• Treating thyroid dysfunction
• Managing diabetes
• Addressing pelvic-floor dysfunction
• Evaluating gastric or intestinal motility
• Correcting an anatomical issue
• Coordinating medication timing
• Supporting hydration and electrolyte needs
• Improving overall nutritional intake

This is where working with Functional Nutrition Rx is key, we will help any underlying causes of the SIBO and work on preventing reoccurrence.

How Does Nutrition Support SIBO Recovery?

Nutrition can reduce symptoms, maintain nutritional status, and help support recovery.

Low-FODMAP diet

A low-FODMAP diet temporarily reduces certain fermentable carbohydrates.

It may decrease:

• Bloating
• Gas
• Abdominal pain
• Diarrhea
• Fermentation-related discomfort

The low-FODMAP diet has stronger evidence for IBS symptom management than it does for eliminating SIBO. Feeling better on the diet does not prove that SIBO is present, and remaining strictly low-FODMAP does not necessarily prevent recurrence. The elimination phase should be limited and followed by systematic reintroduction. Long-term, unnecessarily strict low-FODMAP eating may reduce dietary variety and lower certain beneficial bacterial populations.

Specific Carbohydrate Diet

The Specific Carbohydrate Diet limits many grains, starches, and sugars based on how carbohydrates are digested. Some people report symptom improvement, but strong clinical evidence supporting it as a direct SIBO treatment is lacking. It can also make meeting calorie, carbohydrate, fiber, and micronutrient needs more difficult.

Bi-phasic SIBO diet

The bi-phasic diet combines aspects of low-FODMAP eating with additional restrictions and separate dietary phases. It is used in some integrative practices, but high-quality research demonstrating that it eradicates SIBO is limited. Because it can be very restrictive, it requires careful monitoring and should not be continued automatically.

More restrictive does not mean more therapeutic.

Rebuilding after antimicrobial treatment

The post-treatment phase of SIBO focuses on restoring digestive function, supporting gut motility, and rebuilding a healthy, diverse microbiome. At Functional Nutrition Rx, we gradually reintroduce restricted foods, increase dietary fiber and plant diversity as tolerated, and address nutrient deficiencies. Antimicrobial treatments can disrupt beneficial gut bacteria, making nutritional recovery important for long-term gut health. Our goal is to move clients away from restrictive diets, improve food tolerance, and address underlying factors that may contribute to SIBO recurrence.

What the first eight weeks may look like

Weeks 1–2: Stabilize

Initial priorities may include maintaining adequate calories, managing treatment-related symptoms, supporting hydration, and establishing more consistent bowel movements.

The diet may remain temporarily simplified, but it should still provide adequate protein, carbohydrates, fats, vitamins, and minerals.

Weeks 3–4: Begin expanding

As symptoms settle, the dietitian may begin reintroducing foods or increasing portions of tolerated fiber.

This phase helps distinguish between foods that are genuine symptom triggers and foods that were removed simply because they appeared on a generic SIBO list.

Weeks 5–8: Build resilience and prevent recurrence

The focus gradually shifts toward:

• Greater food variety
• Sustainable fiber intake
• Consistent bowel function
• Adequate meal intake
• Appropriate meal spacing
• Correcting deficiencies
• Supporting the underlying motility or medical condition
• Creating strategies for travel, restaurants, and stressful weeks

Meal spacing may help some support normal digestive motility, but rigid fasting is not appropriate for everyone. It can be especially problematic during pregnancy, for those with diabetes, or for anyone with an eating-disorder history.

The goal is to build the broadest, most nourishing diet the person can comfortably tolerate—not to remain on an elimination diet indefinitely.

Frequently Asked Questions About SIBO and Bloating

Can SIBO cause symptoms beyond bloating?

Yes. SIBO may contribute to gas, abdominal pain, diarrhea, constipation, nausea, early fullness, fatigue, weight loss, and nutrient deficiencies.

These symptoms are not specific to SIBO. Proper evaluation is necessary because several medical and digestive conditions can create the same pattern.

Is the low-FODMAP diet a treatment for SIBO?

A low-FODMAP diet can reduce fermentation-related symptoms, but it is primarily a symptom-management tool. It has not been proven to reliably eradicate SIBO on its own.

When used, it should generally be temporary and followed by structured reintroduction.

Can SIBO come back after treatment?

Yes. SIBO can recur, particularly when an underlying motility, anatomical, medical, or medication-related contributor remains.

Recurrence does not automatically mean you ate the wrong foods or failed to follow the plan. It means the care team may need to reassess the original diagnosis, the treatment response, and the factors that could be allowing overgrowth to return.

Do probiotics help or hurt with SIBO?

Either is possible.  Proper strands of probiotics must be used and depending on the person and type of SIBO.  The Registered Dietitian will assist with the one that is right for you.

How long does it take to recover from SIBO?

There is no universal recovery timeline. Some people notice improvement during treatment or within several weeks. Others need several months to improve motility, manage constipation, expand the diet, correct deficiencies, or address another medical condition. Recovery should not be measured only by a breath-test result. We also evaluate bowel function, bloating, food tolerance, nutritional status, energy, symptom recurrence, and quality of life.

Final Thoughts: Bloating Is Not Something You Have to Just Live With

Persistent bloating deserves investigation.

SIBO is a real, diagnosable, and treatable condition, but it is more complicated than having “too many bad bacteria.” Testing has limitations. Different gas patterns require different treatment considerations. Antibiotics, evidence-informed herbal protocols, and elemental diets may all have a role in appropriately selected individuals.

Long-term improvement often depends on addressing what allowed the overgrowth to develop in the first place. That may include motility, constipation, thyroid function, celiac disease, medication effects, pelvic-floor dysfunction, anatomical changes, or inadequate nutrition.

A registered dietitian who specializes in gastrointestinal health can help connect those pieces while working alongside your gastroenterologist or other medical providers.  At Functional Nutrition Rx, we can help navigate the process.

We review your digestive history, bowel patterns, medical conditions, labs, medications, previous treatments, current intake, and symptom timeline. If an elimination strategy is appropriate, we use it with a purpose, a defined timeframe, and a plan to reintroduce foods.

Because the goal is not to give you the longest possible list of foods you cannot eat.

The goal is to understand why your body is reacting, address the underlying contributors, and help you return to a more varied and comfortable way of eating.

If you have persistent bloating or have already been treated for SIBO without lasting relief, learn more about our gut-health nutrition services or contact Functional Nutrition Rx to schedule an appointment.

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