Why Am I Bloated? What Your Bloating Pattern is Telling You About The Root Cause of Your Bloating

If you feel bloated so often that you honestly cannot remember what it feels like not to be bloated, this article is for you. Maybe you wake up bloated before you’ve eaten anything. Maybe you wake up with a relatively flat stomach, but by dinner you look six months pregnant. Maybe you eat three bites of food and suddenly feel like there is a brick sitting in your stomach. Or maybe you have removed gluten, dairy, FODMAPs, sugar, beans, broccoli, onions, garlic, and basically everything that makes food enjoyable, and you’re still bloated… No bueno!

Here’s the truth: chronic bloating isn’t something we should automatically dismiss as normal digestion, and the solution isn’t always another elimination diet. Bloating is common- and can be normally DEPENDING on the circumstance. But chronic bloating that is consistent, bothersome, or take away from your life? Not normal. Remember this- Bloating is a symptom. It’s your body saying something needs adjusting. It is not a diagnosis.

When I work with someone who is chronically bloated, I don’t immediately ask, “What food did you eat?” I want to understand the entire pattern. Where do you bloat? When does it happen? Do you wake up bloated, or does it build throughout the day? Does it happen immediately after eating or a few hours later? Are you constipated? Do you feel completely empty after you poop? Does it change around your menstrual cycle? Does stress make it worse? Are you also experiencing reflux, burping, nausea, diarrhea, brain fog, or fatigue?

That is where the detective work starts.

Two people can have the exact same symptom, bloating, but completely different root causes. These may include constipation, dysbiosis, SIBO (small intestinal bacterial overgrowth), leaky gut, food intolerances, visceral hypersensitivity, altered gut-brain signaling, parasites, fungal overgrowth, MCAS or histamine intolerance, mold toxicity, ovarian cysts, endometriosis, and abnormal coordination between the diaphragm and abdominal wall. Or they may have bloating due to eating too much volume/roughage, fiber (especially gas producing fibers), lactose intolerance, low pancreatic enzymes or low stomach acid, or low bile output. Aka- lots of causes!

So instead of only asking, “What food is making me bloated?” I think a much better question is: “WHY is my digestive system reacting this way in the first place?”

First: bloating and distention aren’t exactly the same thing

We often use these words interchangeably, but there is actually a difference. Bloating describes the sensation of pressure, fullness, swelling, or gas in the abdomen, while abdominal distention refers to an actual visible increase in the size of the abdomen.

You can feel extremely bloated without looking significantly different, and you can also experience very obvious abdominal distention. This distinction matters because visible distention isn’t always caused by an enormous amount of gas sitting inside your intestines.

In some people with disorders of gut-brain interaction, the diaphragm contracts downward while the abdominal wall relaxes outward. This is a pattern known as abdominophrenic dyssynergia, or APD, and it can produce significant visible distention without a proportional increase in intestinal gas.

This is a perfect example of why we cannot reduce every case of bloating to “you ate the wrong food.” There can be a motility component, a fermentation component, a digestive component, a bowel evacuation component, a hormonal component, a nervous-system component, or several of these happening at the same time.

CLUE #1: Where are you bloating?

Where you experience bloating isn’t diagnostic by itself, but it can give us another piece of the puzzle!

Upper Belly Bloating

If most of your discomfort is high in your abdomen, especially underneath the rib cage or around the stomach, and you experience fullness shortly after beginning a meal, I start thinking more about what is happening in the upper digestive tract.

You may also notice early fullness or early satiety, feeling like food is sitting in your stomach, nausea, burping, reflux, upper abdominal pressure, or heaviness immediately after meals. Potential contributors can include delayed gastric emptying or gastroparesis, functional dyspepsia, H. pylori, low stomach acid, stress, poor meal-time digestive function, inadequate digestive enzyme production, swallowing excessive air, or abdominophrenic dyssynergia.

Functional dyspepsia or gastroparesis, for example, commonly involves post-meal fullness, early satiation, and upper abdominal discomfort or burning. This matters because throwing someone with predominantly upper-GI symptoms onto an increasingly restrictive FODMAP diet may completely miss the larger issue.

You have to ask where digestion is breaking down.

Middle Belly Bloating or All Over Bloating

If you wake up relatively normal and gradually become dramatically distended throughout the entire abdomen, I start thinking more about the small intestine, fermentation, and motility.

This is where I may investigate things like SIBO, intestinal methanogen overgrowth or IMO, altered intestinal motility, migrating motor complex dysfunction, post-infectious IBS, dysbiosis, low pancreatic enzymes, parasites, mold toxicity, estrogen dominance, hypothyroidism, diverticulitis, ovarian cysts, or possibly fungal overgrowth. Also constipated? We may question the pelvic floor, especially if one feels like they can not completely empty their bowels.

This is where testing using SIBO testing and stool based testing like a GI map be extremely useful!

This is also where I see people get stuck all the time. They keep removing foods because eating makes them bloated, but eating isn’t necessarily the root cause. Food may simply be feeding excessive fermentation occurring in the wrong place or exposing an underlying motility problem.

Lower Belly Bloating- Under the Belly Button Bloating

When bloating and pressure are concentrated lower in the abdomen, I pay very close attention to the colon and bowel habits. Now keep in mind, mild lower abdomen belly bloating will happen towards the end of the day after eating all your meals. And it will also happen for women in their luteal phase- but it should not be uncomfortable or excessive to where you look 3-6 months pregnant!

Common causes for this type of bloating include constipation, incomplete evacuation, pelvic-floor dysfunction, large-intestinal fermentation, yeast/candida or fungal overgrowth, low pancreatic enzymes or bile output, estrogen dominance, ovarian cysts, and altered stool transit. You may notice hard stools, little pellets, straining, incomplete evacuation, alternating constipation and diarrhea, or significant gas later in the day.

And here’s something important: pooping every day does NOT automatically mean you aren’t constipated.

Constipation involves much more than frequency. We also have to consider hard or lumpy stool, straining, incomplete evacuation, a sensation of blockage, and whether you need physical maneuvers or supplements to help stool pass.

I’ve had plenty of clients tell me, “But I go every morning!”

Okay, but did you fully evacuate? Was the stool easy to pass? Was it formed appropriately? Did you need to strain? Do you feel like there is still stool left? Do you need coffee, magnesium, or supplements every single day to make yourself go? We can do a motility test for this too using corn. Seeing how long it takes to eat it and then seeing it in your stool. If it takes more than 24 hours, you may be constipated.

Frequency is only one part of motility.

CLUE #2: WHEN does your bloating happen?

The timing of bloating can tell us just as much as the location!

Pattern #1: You wake up already bloated

If you wake up bloated before a bite of food has entered your mouth, I am immediately less suspicious that breakfast itself is your primary problem. One of the first things I want to investigate is constipation and evacuation.

If stool isn’t moving efficiently through the colon, intestinal contents remain available for fermentation, gas can accumulate, and abdominal pressure can increase. Sometimes the bloating improves dramatically after a complete bowel movement. Other times, someone goes every day but never fully evacuates and gradually becomes more distended over several days.

Potential contributors to constipation and slowed motility can include inadequate fiber, inadequate fluid intake, low dietary mineral intake (especially potassium), chronic stress, thyroid dysfunction, intestinal methanogen overgrowth, certain medications, pelvic-floor dysfunction, altered gut-brain signaling, and poor intestinal motility. This type of pattern is more common too with histamine issues or hormone imbalances such as estrogen dominance.

And I want to emphasize something here: do not blindly add massive amounts of fiber to every constipated person. Especially fermentable fibers. You will regret it. (PHGG by the way is less fermentable and my favorite!)

If someone has significant SIBO, IMO, slow transit, pelvic-floor dysfunction, or severe distention, rapidly dumping more fermentable fiber into the system can sometimes make symptoms worse. The goal isn’t simply to “eat more fiber.” The goal is figuring out why stool isn’t moving or evacuating appropriately.

Pattern #2: Flat in the morning, pregnant-looking by evening

This is probably one of the most common bloating patterns I see. You wake up looking pretty normal, then you eat breakfast and notice a little bloating. Lunch comes and it gets worse. By dinner, your pants barely fit.

That progressive, day-long pattern makes me think strongly about fermentation and motility.

Cue SIBO or IMO as a root cause. With SIBO, an excessive number or abnormal composition of bacteria is present in the small bowel. With IMO, methane-producing archaea become clinically relevant and are commonly associated with constipation. Luckily we can test for these!

Every time you eat fermentable carbohydrates, those microorganisms gain access to fuel and produce gaseous byproducts. Then you eat again, fermentation increases again, and if the intestines are not moving those contents along efficiently, the pressure keeps building.

This is why the migrating motor complex, or MMC, matters. Think of the MMC like your small intestine’s housekeeping system between meals. Motility dysfunction is one of the important pieces we consider in recurrent SIBO, which is why simply focusing on which foods someone ate usually doesn’t tell the whole story.

Potential contributors to this progressive pattern include SIBO, IMO, impaired intestinal motility, migrating motor complex dysfunction, post-infectious IBS after food poisoning or GI infection, dysbiosis, constipation, fungal overgrowth, parasites, low pancreatic enzymes/stomach acid/bile flow.

Remember this root cause fact- If you only kill bacteria without figuring out WHY the overgrowth happened, don’t be surprised when the bloating eventually comes back.

Root cause matters.

Pattern #3: You bloat almost immediately after eating

If you’re noticeably bloated five or ten minutes after eating, I start thinking differently. That is very fast for food to reach your colon and suddenly undergo massive bacterial fermentation.

This pattern often points us back toward the upper digestive process or the body’s physical response to eating. I think digestive capacity- the ability to break down your food. Stomach acid? Upper GI motility? Within 1 hour it hits the small intestine- then I think- pancreatic enzymes? Bile flow? Overgrowths/dysbiosis?

Questions to ask- Do you feel overly full after only a small meal? Are you burping constantly? Does food feel like it sits heavily in your stomach? Do you have reflux, nausea, or upper abdominal pressure? Does it relieve or get worse after an hour? Do you feel better with lower fat or protein meals? What type of carbs or fruits/veggies make it worse?

Potential contributors include eating too quickly, swallowing excessive air, talking while chewing, drinking from straws, chewing gum, carbonated beverages, chronic stress, delayed gastric emptying, functional dyspepsia, H. pylori, digestive enzyme insufficiency- especially low stomach acid, low pancreatic enzymes, or altered gut-brain signaling. Eating too big of a meal or too much volume/roughage can and will make this worse. Plus not actually chewing your food well.

This is why HOW you eat matters too.

Someone inhaling lunch while answering emails, barely chewing, and operating in full fight-or-flight mode is creating a very different digestive environment than someone who sits down, slows down, and actually chews their food.

Which brings me to another huge piece of this…

Pattern #4: Your bloating seems random, or stress makes it explode

This is the client who tells me, “I’ve treated SIBO. I’ve changed my diet. My labs look okay. I’ve removed everything. I’m STILL bloated.”

Sometimes we need to look beyond microorganisms and food lists and evaluate the gut-brain axis, visceral sensitivity, and the neuromuscular response of the abdomen.

This does not mean your symptoms are “in your head.” Quite the opposite.

With visceral hypersensitivity, a normal amount of gas, fluid, or intestinal stretching may create a disproportionately uncomfortable sensation of pressure or pain. Visceral hypersensitivity is well-described in IBS and other disorders of gut-brain interaction.

Then we have abdominophrenic dyssynergia. Normally, your diaphragm and abdominal wall coordinate with each other as the volume inside your digestive tract changes. In APD, that coordination becomes altered. The diaphragm moves downward while the abdominal wall relaxes and protrudes outward.

The result? Someone can experience very dramatic visible distention even when there isn’t an enormous increase in intestinal gas. This is one reason someone can eat something as seemingly harmless as a small meal and suddenly look dramatically distended.

Questioning an anterior pelvic tilt is also important- as I see this VERY commonly in post partum women and athletes!

Potential contributors to this type of bloating include chronic stress, gut-brain dysregulation, visceral hypersensitivity, histamine intolerance or MCAS, poor coordination between the diaphragm and abdominal wall, pelvic-floor dysfunction, eating constantly “on the go,” anxiety surrounding food or GI symptoms, leaky gut, parasites, dysbiosis.

Pattern #5: Your bloating is tied to your menstrual cycle

Now we get into one of my favorite subjects: hormones and the gut.

If bloating consistently becomes worse in the second half of your cycle or around your period, your hormones may absolutely be part of the picture. Sex hormones interact with gastrointestinal motility and visceral sensation, and GI symptoms can fluctuate across the menstrual cycle.

Progesterone can influence gastrointestinal smooth muscle and may slow motility, while symptoms can shift again as estrogen and progesterone decline around menstruation. This is why some women notice more constipation, bloating, reflux, gas, water retention, and abdominal pressure during certain parts of their cycle. Many women feel some bloating in their luteal phase!

Estrogen also can cause GI distress as if MCAS or histamine intolerance are involved, GI related histamine reactions can worsen early fullness, bloating, and cause increased “food reactions”. This is because when estrogen is higher, DAO which degrades histamine goes down and histamine itself destabilizes mast cells. Learn about MCAS and mast cells here.

Around menstruation, increasing prostaglandin activity can create another shift in GI function, sometimes contributing to looser stools, urgency, cramping, or worsening abdominal pain. I call this “period poops”.

And if you already have IBS, constipation, SIBO, or gut dysbiosis, your cycle may act like an amplifier. The hormone fluctuation didn’t necessarily create the entire gut problem, but it can turn up the volume on something that was already there. Especially if histamine issues or estrogen dominance are present. Endometriosis? This will worsen your digestion 1000x in your luteal phase and early start to your period!

This is where I may also look at WHY hormones are potentially off- from stress, toxin load, gut health, bile flow, micronutrient status, to systemic inflammation and chronic infections.

Pattern #6: Certain foods consistently make you bloat

Food absolutely can matter. But food reactions are another area where we need to ask why. We need to question too- is it really the food? Or is it lack of break down of the food? Is it an heightened immune or inflammatory response and the food is just the final drop in the bucket causing the reaction?

Also- A food intolerance is not the same thing as an IgE-mediated food allergy. Food allergies can create rapid immune reactions, while food intolerances are more commonly related to digestion, absorption, fermentation, or sensitivity and may produce symptoms hours later. DO NOT cut foods out just because an “IGG test” told you too. That could be an immune reaction, or could just be indicating exposure! DO remove IG-E allergies.

Common symptoms of food intolerances (or “pseudo food intolerances” in which it isn’t the food but the actual immune response to the food”)- can include gas, bloating, abdominal pain, diarrhea, and nausea. Potential triggers may include lactose, fructans, higher FODMAP foods, wheat, gluten in susceptible individuals, dairy, soy, sugar alcohols, higher histamine foods, eggs, nuts, etc. The list could go on and on!

But here is where functional medicine gets important: sometimes the intolerance isn’t the root cause.

If someone develops SIBO and suddenly reacts to foods they tolerated perfectly well for 30 years, I don’t automatically assume they suddenly became intolerant of 40 different foods. Maybe something changed in their intestinal environment. That’s the immune response. Or the digestive capacity, fermentation, MMC, etc.

Potential reasons someone becomes increasingly food-sensitive can include SIBO, dysbiosis, reduced digestive-enzyme activity, histamine intolerance or MCAS, altered motility, parasites, mold toxicity, chronic infections like Lyme, and increased visceral sensitivity.

Removing a triggering food may temporarily decrease symptoms, and sometimes an elimination diet is absolutely useful therapeutically. But endless restriction without asking why tolerance changed in the first place is how people end up eating chicken, zucchini, and rice for three years while still being bloated.

That’s symptom management, not necessarily root-cause resolution. We want root cause solution!

Your bowel movements are one of the biggest clues

I cannot talk about bloating without talking about poop.

If you’re bloated, I want to know how often you’re going, what your stool looks like, whether you strain, whether you feel completely empty afterward, whether you experience urgency or diarrhea, whether you have pellet stools, whether you alternate between diarrhea and constipation, and whether you need supplements every day to make yourself go.

Constipation itself can significantly contribute to bloating, and difficult evacuation may also point toward pelvic-floor dysfunction or another mechanical issue.

If someone has chronic incomplete evacuation, simply throwing antimicrobials at their microbiome isn’t going to solve the entire picture. Neither is removing more foods.

We need to restore movement.

So… is ANY bloating normal?

YES.

Your abdomen does not need to look exactly the same from 7 AM until 10 PM. You eat food. You drink fluid. Your intestines contain stool. Your microbes ferment fiber. Your menstrual cycle changes. Your abdominal contents physically change throughout the day.

A small amount of temporary fullness can be completely normal.

Examples of relatively normal bloating can include mild fullness after a particularly large meal, some gas after increasing fiber, temporary bloating from beans, lentils, or cruciferous vegetables, mild cyclical bloating around menstruation, temporary water retention after a high-sodium restaurant meal, bloating that resolves after a bowel movement, or occasional bloating that disappears within several hours.

I don’t want women obsessing over having a perfectly flat stomach 24/7.

That isn’t the goal.

The question is whether your bloating has become chronic, severe, or disruptive.

Bloating that deserves a closer look

I take bloating more seriously when it happens almost every day, is present from morning until night, causes significant pain, dramatically distends the abdomen, occurs regardless of what you eat, is accompanied by chronic constipation or diarrhea, comes with reflux, nausea, or significant upper-GI symptoms, creates severe food restriction or fear around eating, is associated with significant fatigue or other systemic symptoms, or has progressively worsened.

Certain symptoms should also prompt medical evaluation rather than simply trying another supplement. These include unexplained weight loss, GI bleeding, persistent vomiting, anemia, fever, a new abdominal mass, or rapidly changing or severe symptoms.

What should you actually investigate?

This is where I zoom OUT.

Instead of asking, “Which supplement gets rid of bloating?” I want to understand which system is actually struggling.

Is digestion working appropriately?

Are you chewing your food? Are you eating slowly? Are there signs of upper-GI dysfunction, reflux, H. pylori, functional dyspepsia, or delayed gastric emptying? Do we need to assess digestive enzymes, bile flow, stomach function, or other digestive factors?

Is food moving through the GI tract appropriately?

Are you constipated? Are you fully evacuating? Is methane involved? Could your pelvic floor be contributing? Is intestinal motility impaired?

Is there excessive fermentation?

Do symptoms progressively increase after meals? Did symptoms begin after food poisoning? Is SIBO or IMO worth investigating? Is there broader dysbiosis?

Are food intolerances the cause, or the consequence?

Did you always react to these foods, or did your food tolerance progressively shrink as your digestive health worsened?

What is your nervous system doing?

Are you eating while driving, working, answering emails, anxious, or rushing? Are you chronically living in sympathetic fight-or-flight mode? Could visceral hypersensitivity or APD be part of the picture?

Are hormones contributing?

Does bloating track with ovulation, the luteal phase, or your period? Do you also experience constipation, PMS, or other cyclical symptoms?

What else could be slowing down the system?

This is where thyroid function, medications, nutrient intake, physical activity, and other health conditions matter too.

You cannot look at the gut in isolation.

The biggest mistake I see with chronic bloating

People keep focusing on removing things.

Remove gluten. Remove dairy. Remove FODMAPs. Remove histamine. Remove lectins. Remove oxalates. Remove fruit. Remove starch.

And sometimes removing certain foods DOES decrease symptoms.

But eventually we need to ask: Why can’t your body tolerate food anymore?

Because the goal isn’t to create the smallest food list possible. The goal is to restore digestive function and build resiliency so that, when medically appropriate, your diet can become more diverse, not less.

Maybe the problem is constipation. Maybe it’s SIBO. Maybe it’s methane. Maybe it’s impaired motility. Maybe it’s functional dyspepsia. Maybe it’s H. pylori. Maybe it’s pelvic-floor dysfunction. Maybe it’s visceral hypersensitivity. Maybe hormones are magnifying an underlying gut issue. Maybe there are several overlapping pieces.

That is why root-cause work is detective work.

The pattern matters. Your history matters. Your bowel movements matter. Your cycle matters. Your stress response matters. And your symptoms are information.

The bottom line

If you’re chronically bloated, you probably don’t need someone to hand you another list of foods you’re “not allowed” to eat. You need someone to zoom out and connect the dots.

Where does the bloating occur? When does it occur? What are your bowel movements doing? What happens after you eat? How is your motility? Does it change with stress? Does it change with your menstrual cycle? Did everything start after an infection, illness, medication, or major change in your health?

Those answers begin to tell us which mechanisms deserve more investigation.

Because once you understand why you’re bloating, you can stop randomly chasing symptoms and actually build a plan around the root cause.

Want help for your bloating?

Work with me and get back to healthy, happy digestion!

Love- Lacey Dunn Holland, MS, RD, LD, CPT, Functional Medicine Clinician