Bloating That Won’t Settle: What to Rule Out and What to Test
Written and medically reviewed by Dr. Karolina Skrzypek, MD
Gut Health
Read Time: 11 min
Flat in the morning, swollen by evening. Clothes that fit at breakfast and don’t by dinner. Bloating is so common that it often gets brushed off. Now and then, it is also the first sign of something that needs a doctor soon. You may have already cut out gluten, dairy, or a long list of foods without a clear answer. Or you may have been told it is IBS without any tests. So what should be ruled out first, and which gut tests are worth doing?
This article explains what to rule out first, what gut testing for bloating should include, and which tests you can trust.
The goal isn’t to assume that bloating is just a food problem.
It is to make sure nothing serious is being missed, and then to find what is really causing it.
That may be slow digestion, a sugar you can’t break down, your thyroid, your hormones, or something else.
In short
Feeling bloated and having a visibly swollen belly are not the same thing, and the difference can point toward the cause.
Common causes include:
Constipation and not emptying fully
Irritable bowel syndrome, or IBS
Trouble digesting lactose or fructose
A gut that moves too slowly or too fast
Swallowed air
SIBO, celiac disease, an imbalance in gut bacteria, pelvic floor problems, or a stomach that empties slowly may also play a part.
Celiac disease should be ruled out before you cut out gluten, because the blood tests stop working once you stop eating it.
Bloating that is new and does not settle needs to be checked soon, especially over the age of 50. It can be a sign of something more serious.
What is the difference between bloating and a swollen belly?
Bloating is a feeling: pressure, fullness, or trapped gas.
A swollen belly is something you can see. Your abdomen gets bigger, and clothes that fit in the morning don’t by evening. Doctors call this distension.
The two often go together, but not always.
Bloating without much swelling is common in IBS, where the gut is extra sensitive to normal amounts of gas.
Swelling that builds through the day more often points to slow digestion, constipation, or a sugar that gut bacteria are turning into gas.
In some people, the belly muscles relax and the diaphragm pushes down in response to gas. That makes the belly look bigger than the gas alone would explain.
Knowing which one you have does not give a diagnosis, but it narrows where to look.
Why can bloating keep going after you change your diet?
Changing what you eat works for some people.
When it doesn’t, the reason is usually that food was never the cause.
Constipation can cause bloating even if you go every day, because not emptying fully leaves stool and gas behind.
An underactive thyroid slows the gut down, so bloating and constipation may be thyroid symptoms rather than gut symptoms.
Hormone changes across your cycle affect fluid and gut movement. That is why some women bloat in the days before a period, every month.
Problems in the pelvis, including the ovaries, can show up as bloating. They are easy to blame on food for months before anyone looks.
Celiac disease can sit underneath years of bloating. Once gluten is out of your diet, the usual tests can no longer find it.
Cutting out more foods does not answer any of these questions, and it can leave you on a much narrower diet with the same symptoms.
Who should consider gut testing for bloating?
Gut testing may be worth considering if you have:
Bloating that keeps coming back or builds through the day
A belly that is visibly swollen by evening
Bloating with constipation or not emptying fully
Bloating after certain meals, dairy, fruit, or sweeteners
Bloating that follows your cycle
Bloating with tiredness, feeling cold, or thinning hair
Bloating that has not settled after cutting out foods
Bloating you were told is IBS without any tests
It applies especially if you have cut out foods without a clear result.
It matters less if your bloating is new, constant, and comes with pain, feeling full quickly, or weight change.
That needs a doctor first, and this article should not delay it.
If constipation, tiredness, and feeling cold go together, read our article on thyroid symptoms when your labs look normal.
What should gut testing for bloating include?
No single set of tests fits everyone with bloating, and the order matters.
Depending on your symptoms and history, testing may include the following.
Celiac blood tests, while you are still eating gluten
Celiac disease is ruled out with a blood test for tissue transglutaminase IgA, an antibody made in celiac disease.
Total IgA is checked too, because some people make very little IgA. For them the standard test reads falsely normal, and a different version is needed.
The test only works while gluten is part of your diet, usually for several weeks beforehand.
A complete blood count and ferritin
Low iron alongside gut symptoms needs to be looked into, not just treated with a supplement.
It can point to celiac disease, inflammatory bowel disease, or bleeding in the gut, and none of those should be missed.
A GI-MAP stool test
The GI-MAP is a stool test that looks at several things from one sample.
It checks how well you digest food, signs of inflammation, the balance of gut bacteria, and infections such as H. pylori and parasites.
It includes calprotectin, the marker that helps tell inflammatory bowel disease apart from IBS. A normal calprotectin makes inflammation unlikely.
Dr. Skrzypek recommends it for most people with bloating that keeps coming back, because it answers several questions at once instead of guessing.
A constipation and gut movement check
Stool shape and how often you go are looked at properly, not just whether you go every day.
Not emptying fully causes bloating even in people who go daily.
Where the pattern fits, pelvic floor problems are considered. If the muscles you use to empty your bowels don’t relax, the result is the same.
Breath testing for bacterial overgrowth
Small intestinal bacterial overgrowth, or SIBO, means too many bacteria in the wrong part of the gut. It can cause bloating, gas, discomfort, constipation, diarrhea, and food intolerances.
Breath testing can help check for hydrogen or methane overgrowth. It is most useful when your symptoms and history already point that way.
Reading the result is less clear-cut than for lactose and fructose testing, so it is read together with your symptoms, bowel habits, diet, and medications.
A review of your diet before you cut anything else out
What you have already removed, for how long, and what happened.
This stops the same trials being repeated.
A structured plan to cut foods out and add them back, ideally with a dietitian, comes after the tests above, not before.
Thyroid, hormones, medications, and other look-alikes
An underactive thyroid slows the gut and causes constipation, so thyroid tests are checked when bloating comes with tiredness, feeling cold, or hair changes.
Bloating that follows your cycle points to a hormone contribution. It is checked alongside gut causes, not instead of them.
Some medications slow the gut, including iron supplements, some pain medications, and some diabetes and blood pressure medicines.
A stomach that empties slowly is considered when bloating comes with feeling full quickly and nausea after meals.
What type of doctor should I see for bloating?
Different doctors answer different questions, and the order matters more here than on most pages.
Primary care physician
Primary care is the right first step for bloating that has never been checked.
Your primary care doctor can order celiac blood tests, a blood count, ferritin, and thyroid tests, and refer you on if needed.
Gastroenterologist
A gastroenterologist is a gut specialist. They check for a physical problem or inflammation in the gut, and they do the camera tests, endoscopy and colonoscopy, when needed.
See one first, and quickly, when there are warning signs.
Those include losing weight without trying, blood in your stool, vomiting, trouble swallowing, and new bloating that does not go away after age 50.
They usually do not cover diet work, or symptoms that carry on after a physical cause has been ruled out.
Gynecologist
A gynecologist checks whether the cause is in the pelvis. That matters most when bloating is new and does not go away.
See one soon when bloating comes with pelvic pain, feeling full quickly, or an urgent need to pee.
The same applies if ovarian or breast cancer runs in your family.
Functional medicine physician
A functional medicine approach looks at gut movement, sugar intolerance, thyroid and hormone contribution, and possible bacterial overgrowth together.
It is the right step after serious disease has been ruled out, or when symptoms carry on after normal camera tests.
At NaturaMed, care is physician-led by Dr. Karolina Skrzypek, MD, who is double board-certified in internal medicine and integrative medicine.
Patients are seen in the Maitland and Orlando area and by telemedicine in states where Dr. Skrzypek is licensed.
When endoscopy, imaging, or care for inflammatory bowel disease is needed, we work with the right specialist.
You can read more about how we work.
Registered dietitian trained in the low FODMAP diet
A dietitian works out which sugars are driving your symptoms, by cutting foods out and adding them back in a set order.
It is the right step once celiac disease has been ruled out.
Do it with a dietitian rather than alone, because adding foods back is the part people skip.
Lab testing is outside a dietitian’s scope, so this step comes after the testing, not instead of it.
Where bloating testing often falls short
There are a few patterns we see again and again when bloating has gone on for months without an answer.
Gluten was cut out before celiac disease was tested. Once gluten is out of your diet, the usual blood tests can no longer find celiac disease.
That leaves adding gluten back under supervision, or never knowing.
The label was IBS, and no tests came with it. IBS is a fair diagnosis once celiac disease, inflammation, and low iron have been ruled out.
Without those tests, it is a description of symptoms, not a diagnosis.
Constipation was ruled out because you go every day. Going often is not the same as emptying fully.
Not emptying fully, and pelvic floor problems, cause bloating in people who would never call themselves constipated.
Low iron was treated instead of looked into. A supplement raises the number and hides the reason it was low.
Low iron with gut symptoms needs an explanation.
Every symptom gets blamed on food. New, lasting bloating with pelvic pain, feeling full quickly, or an urgent need to pee is not a food problem.
It is a reason to check the pelvis first.
Thyroid, hormone, and medication causes get missed the same way when the only question asked is what you ate.
Which symptoms may point to which tests?
The right tests depend on your own history.
If you’re experiencing | Testing may include |
|---|---|
Bloating with unexplained low iron or weight loss | Celiac blood tests and a gut specialist first |
Flat in the morning and swollen by evening | A constipation check, plus breath testing for sugar intolerance |
Bloating with gas, loose stools, or a change in bowel habit | A GI-MAP stool test, and breath testing for SIBO if the history fits |
Bloating after dairy, fruit, or sweeteners | Hydrogen breath testing for lactose and fructose |
Bloating that follows your menstrual cycle | Hormone causes, checked alongside gut causes |
Bloating with feeling cold, tiredness, and constipation | A thyroid panel, since a slow gut is a common hypothyroid sign |
New, lasting bloating with pelvic pain, feeling full quickly, or an urgent need to pee | A gynecologist, soon |
New bloating that is there most days for three weeks or more needs to be checked soon, especially over 50 or if ovarian or breast cancer runs in your family.
The same goes for feeling full quickly, pelvic or belly pain, an urgent need to pee, weight loss without trying, blood in your stool, vomiting, or trouble swallowing. These are not reasons to try another diet first.
How we approach bloating at NaturaMed
At NaturaMed, we don’t start by assuming bloating is a food problem.
We start by looking at the whole picture.
When did the bloating start, and does it build through the day?
What has already been tested, and was celiac disease checked while you were still eating gluten?
What have you cut out of your diet, for how long, and what happened?
How often do you go, and does it feel complete?
Does the bloating follow your menstrual cycle?
Are you tired, cold, or losing hair?
What medications and supplements are you taking?
From there, we decide which tests make sense and what to rule out before any diet change.
For most people, that starts with a GI-MAP stool test alongside the blood tests above.
Our Feel Better Faster program begins with an in-depth physician evaluation with Dr. Skrzypek.
Testing is chosen based on your own history instead of running the same set of tests for everyone.
The program includes physician follow-up and nutrition and health coaching over six months.
That is where cutting foods out and adding them back is done properly.
Advanced testing is priced separately, and recommended testing is discussed with you before it is ordered.
You can learn more about how the program works, explore our approach to gut health, or read about hormone imbalance symptoms in women.
Frequently Asked Questions
Is bloating ever serious?
Usually not, and now and then, yes. Bloating that is new and does not go away is one of the ways ovarian cancer and other serious conditions can show up. It is often blamed on food for months before anyone looks. Bloating that is new and is there most days for three weeks or more should be checked soon. So should bloating with feeling full quickly, pelvic pain, or an urgent need to pee.
Should I go gluten-free to see if it helps?
Not before celiac testing. The blood tests only work while you are still eating gluten. Cutting it out first means either weeks of eating it again to test properly, or never getting an answer. Test first, then try.
Do I have SIBO?
Possibly. SIBO means too many bacteria in the small intestine. It can cause bloating, gas, belly discomfort, constipation, diarrhea, and food intolerances. Breath testing can help check for bacterial or methane overgrowth. It is most useful when your symptoms and history point that way. We read the result together with your symptoms, bowel habits, diet, medications, and other findings to decide whether SIBO is part of the problem.
Are food sensitivity tests useful?
They can be, with limits. Food sensitivity testing may help point to foods that could be adding to your symptoms. It gives a more targeted place to start than cutting out large numbers of foods. We do not use the results on their own. We combine them with your symptoms, your diet history, and a structured plan to cut foods out and add them back. That is how we find which foods really affect you.
Why is my bloating worse before my period?
Hormone changes affect fluid and gut movement, so bloating before a period is common and real. It is worth checking alongside gut causes rather than treating it as separate, especially when other symptoms follow your cycle too.
Is bloating testing covered by insurance?
Consultations at NaturaMed are generally not covered by insurance. Some lab work can be billed through insurance, but specialty tests such as breath testing and stool analysis usually are not. Many patients use HSA or FSA funds. Costs are reviewed before testing is ordered.
Do I have to live in Florida to become a patient?
Telemedicine medical care depends on physician licensure in the state where the patient is physically located at the time of the visit. NaturaMed sees patients in person in the Maitland, Florida area and by telemedicine in states where our physician is licensed. Our team can confirm availability before you schedule.
