What Does a Functional Medicine Doctor Test for With Chronic Bloating?
A look inside the actual workup, beyond an elimination diet and a shrug
If you have brought chronic bloating to a conventional appointment before, the experience is often familiar. A quick set of questions, maybe a suggestion to try cutting dairy or gluten, and if nothing looks alarming, a reassurance that everything is probably fine. For many women, that reassurance does not match how they actually feel day to day, and it certainly does not explain why the bloating keeps coming back.
A functional medicine evaluation for chronic bloating looks considerably different. Instead of starting and stopping at symptom management, the goal is to identify which specific system, infection, or imbalance is actually driving the bloating, using targeted testing rather than guesswork. Here is what that workup typically includes and why each piece matters.
"Bloating is a symptom, not a diagnosis. The right test does not just confirm that you are bloated. It tells you why."
Quick Summary
- A SIBO breath test measures hydrogen and methane gas to identify bacterial overgrowth in the small intestine.
- H. pylori testing, typically a stool antigen or breath test, checks for a bacterial infection that can significantly affect digestion and bloating.
- Comprehensive stool testing evaluates gut bacteria balance, inflammation markers, and signs of malabsorption.
- Digestive enzyme and bile function testing looks at whether your body is actually breaking down food effectively.
- Food sensitivity and elimination testing helps identify specific triggers rather than eliminating entire food groups indefinitely.
- Thyroid and hormone testing rules out slowed motility or fluid retention as contributors.
- Nutrient testing checks for deficiencies that can result from, or contribute to, ongoing digestive dysfunction.
Jump to a Section
Why the Workup Looks Different
Chronic bloating can come from bacterial overgrowth, an infection, insufficient digestive enzymes, food sensitivities, hormonal shifts, or some combination of several of these at once. A conventional visit is often built to rule out something dangerous, which is important, but it is not built to identify the specific, treatable driver behind day to day bloating once serious causes have been excluded. A functional medicine workup picks up exactly where that leaves off.
A real answer starts with the right test, not another round of eliminating foods and hoping something changes.
If your bloating seems to worsen with stress and never fully settle, your adrenal physiology may be tangled up with your digestion.
Get the Adrenal Fatigue GuideSeven Things Worth Testing For
SIBO Breath Testing
Small intestinal bacterial overgrowth, or SIBO, happens when bacteria that belong in the colon migrate into the small intestine and ferment food there instead, producing the gas that causes bloating and distension. A SIBO breath test measures hydrogen and methane in your breath after drinking a sugar solution, typically lactulose, with samples collected over one to three hours. A significant rise in these gases within a defined window indicates bacterial overgrowth, and the specific gas pattern, hydrogen dominant, methane dominant, or a mix of both, helps guide which treatment approach is most appropriate.
This is one of the most commonly ordered tests in a functional bloating workup, because SIBO is both common and frequently missed in standard care, a topic I explore further in SIBO Doctor Newport Beach.
H. Pylori Testing
Helicobacter pylori is a bacterial infection of the stomach lining that can cause bloating, fullness after eating, nausea, and upper abdominal discomfort, and it is more common than most people realize. Testing typically involves a stool antigen test, which detects an active infection directly, or a breath test using labeled urea. Research evaluating stool antigen testing has found it to be a reliable, noninvasive way to identify an ongoing infection rather than simply confirming past exposure.
H. pylori is frequently overlooked in a standard bloating workup because it is not always associated with classic ulcer symptoms, yet it can be a significant, treatable contributor to chronic upper abdominal bloating and discomfort.
Comprehensive Stool Testing
A comprehensive stool panel goes well beyond a standard culture. It evaluates the balance of beneficial and potentially harmful gut bacteria, markers of intestinal inflammation, signs of malabsorption, and evidence of dysbiosis, an imbalance in the gut microbial community that can directly affect motility and gas production. This kind of testing can identify patterns that a symptom based conversation alone simply cannot capture.
For women whose bloating comes with irregular bowel habits, reactivity to a wide range of foods, or a sense that their gut has never quite been the same since an illness or a course of antibiotics, this test often reveals the piece that ties everything together, a pattern I discuss further in Functional Medicine for Gut Health in Newport Beach.
Digestive Enzyme and Bile Function
Bloating is not only about what is fermenting in your gut, it is also about how well your body is breaking food down in the first place. Stomach acid, pancreatic enzymes, and bile all play a role in properly digesting protein, carbohydrates, and fat, and deficiencies in any of these can lead to undigested food sitting longer and fermenting, producing the exact gas and distension so many women describe. Chronic stress, long term use of acid suppressing medications, prior H. pylori infection, and gallbladder removal are all recognized reasons digestive enzyme function can become insufficient.
This piece of the workup often gets skipped entirely in conventional care, yet it can be one of the more directly correctable contributors once identified.
Food Sensitivity Evaluation
Rather than eliminating entire food groups indefinitely and hoping something improves, a targeted food sensitivity evaluation, often combined with a structured elimination and reintroduction process, can identify which specific foods are actually contributing to your symptoms. This distinction matters, since many nutritious foods that get blamed generally, dairy, gluten, certain vegetables, may not be the actual issue for every individual woman.
This step works best in combination with the other testing above, since a food sensitivity alone rarely explains chronic bloating completely without also considering bacterial balance, infection, and digestive function.
Thyroid and Hormone Testing
An underactive thyroid slows gut motility directly, and hormonal shifts, particularly progesterone changes during perimenopause or the luteal phase of the cycle, can affect both motility and fluid retention. A full thyroid panel, not just TSH, along with relevant hormone levels, helps determine whether a hormonal or metabolic pattern is layering on top of, or entirely driving, what looks like a purely digestive issue.
This is a step I rarely see included in a standard gastroenterology workup for bloating, even though it can be one of the more significant pieces for women specifically, a topic I explore further in Choosing a Thyroid Doctor in Orange County.
Nutrient Status
Chronic bloating and the digestive dysfunction behind it can both cause and result from nutrient deficiencies, since a struggling gut absorbs nutrients less efficiently, and low levels of certain nutrients, iron, vitamin D, zinc, and B12 among them, can worsen digestive symptoms and slow healing. Checking nutrient status rounds out the picture and helps ensure that any treatment plan is actually supported by what your body has available to heal.
This is especially relevant for women who have been dealing with bloating long enough that appetite, food variety, or absorption have already been affected.
Not sure where to start? The free Gut Health Guide can help you see whether your digestion may be part of a bigger picture before you invest in a full workup.
Take the Gut Health GuideChronic bloating is not something you simply have to live with. It usually has a specific, identifiable driver, and the right combination of testing is what actually reveals it instead of another round of guessing.
What Happens After Testing
The goal of this workup was never to run every test on every person. It is to build a clear enough picture that the plan that follows actually matches what your body needs, whether that is treating SIBO or an H. pylori infection directly, supporting digestive enzyme and bile function, addressing a specific food sensitivity, correcting a hormonal or thyroid pattern, or replenishing a nutrient deficiency. Most women end up needing a combination of these rather than just one, which is exactly why testing matters more than guessing.
Ready to Find Out What Is Actually Behind Your Bloating?
If you have been told everything looks fine and you still feel distended and uncomfortable, you deserve a real workup, not another elimination diet. Book a consultation and let us find the pattern together.
Book Your ConsultationFrequently Asked Questions
What tests does a functional medicine doctor order for chronic bloating?
A typical workup includes SIBO breath testing, H. pylori testing, comprehensive stool analysis, digestive enzyme and bile function evaluation, food sensitivity testing, a full thyroid and hormone panel, and nutrient status testing, depending on your specific symptoms and history.
How is SIBO actually diagnosed?
SIBO is diagnosed with a breath test that measures hydrogen and methane gas after drinking a lactulose solution, with breath samples collected over one to three hours. A significant rise in these gases within a defined window indicates bacterial overgrowth.
Can H. pylori cause bloating without an ulcer?
Yes. H. pylori infection can cause bloating, fullness after eating, and upper abdominal discomfort without producing classic ulcer symptoms, which is part of why it is frequently missed in a standard evaluation.
Why would a bloating workup include thyroid and hormone testing?
An underactive thyroid directly slows gut motility, and hormonal shifts such as progesterone changes can affect both motility and fluid retention, so ruling these in or out gives a more complete picture of what is actually driving the bloating.
About Dr. Nirvana Tehranian, ND
Dr. Nirvana Tehranian is a licensed Naturopathic Doctor with 20 years of clinical experience running comprehensive functional medicine workups for women with chronic bloating and digestive dysfunction. Based in Newport Beach, CA, she offers in person and California telehealth consultations for women who have been told everything looks fine and still do not feel that way.
"I had been told my labs were normal for years. My SIBO breath test finally showed what standard testing never looked for."
"Nobody ever tested me for H. pylori even though I had bloating and stomach discomfort for over a year. It turned out to be the whole issue."
"I thought I just needed to eliminate more foods. My comprehensive stool test showed I actually needed digestive enzyme support instead."
Continue Learning
- SIBO Doctor Newport Beach
- Functional Medicine for Gut Health in Newport Beach
- Gut Health
- Why Am I Bloated Every Day Even Though I Eat Healthy
- Why Does My Stomach Get More Bloated as the Day Goes On
- Choosing a Thyroid Doctor in Orange County
References
- Evaluation of a New Monoclonal Chemiluminescent Immunoassay Stool Antigen Test for the Diagnosis of Helicobacter Pylori Infection, a Spanish Multicentre Study. PubMed Central.
- Rifaximin Treatment in Bloating Predominant Functional Bowel Disorders. ClinicalTrials.gov.
- Pathophysiology, Evaluation, and Treatment of Bloating, Hope, Hype, or Hot Air? PubMed Central.
This article is intended for educational purposes only and should not replace personalized medical advice. Always consult with your healthcare provider before making changes to your diet, medications, or supplements.