Issue 031

Bloating in perimenopause: the 5 causes and what helps

Yvette Rose · 8 min read

There is a kind of bloating that is a nuisance after a big meal, and there is a kind that runs your life. You own 2 sizes of jeans. You know which restaurants are safe. You say no to the dinner because by 7 you will look 5 months pregnant and feel like you cannot breathe. That second kind is a symptom with about 5 common causes, and they need different fixes, which is why the probiotic did nothing. This note is how I sort them, in the order I sort them, and when I send someone for a workup instead.

Bloating and distension are 2 different things

Doctors separate the feeling of being swollen, which is bloating, from the belly visibly getting bigger, which is distension. You can have either without the other. The gastroenterology guidance I work from calls it a problem of the brain and gut together, and it says plainly that probiotics are not recommended for bloating. I say that early because the probiotic is usually the first thing a client has tried and the first thing she blames herself for failing.

The other thing worth knowing is that bloating in a woman in her forties is rarely one thing. Constipation, hormones, how you breathe, what you eat and a thyroid that nobody tested properly all stack on top of each other. Pull one layer off and the rest gets easier to see.

Constipation is where I start

If you go less than once a day, strain, or feel unfinished, that is the first layer and often the biggest. Stool that sits in the colon ferments, and the gas has nowhere to go. In a 2025 survey of nearly 600 midlife women presented to the Menopause Society, 77 percent reported bloating and 54 percent constipation.

Perimenopause makes this worse through progesterone, which slows the colon, and through the general slowing that comes with less movement, less water and more sitting. Fiber is the fix for most women, and it is the fix that makes bloating worse for the first 2 weeks, which is when everyone quits. Go up by 5 grams a week with water alongside, toward 25 to 30 grams a day, and give it a month. Magnesium citrate at night helps some women and I wrote about the limits in Issue 029. If you take thyroid medication, keep magnesium 4 hours away from it.

Hormones, water and the cycle

Estrogen tells the kidneys to hold sodium and water. In perimenopause estrogen does not fall in a line. It swings, sometimes higher than it has been in years, and the week it spikes you hold water. Progesterone, when it is present, slows the gut. Estradiol slows stomach emptying. So the belly that is flat on day 7 and swollen on day 24 is doing something real and predictable.

I ask every woman to track bloating against her cycle for 2 full cycles before we change anything, because if the pattern follows the cycle, the answer is hormonal and the gut is the messenger. That is also the point where I use the chart, lightly, to look at timing. Why this got loud at 44 and not 34, why it is always worse in the same month. It is a map, never a diagnosis.

The breath you are holding

This one is new to most people. In some women the body responds to a normal amount of gas by doing the opposite of what it should. The diaphragm pushes down and the abdominal wall relaxes outward, so the belly distends even when the gut holds no more gas than anyone else's. It has a long name, abdominophrenic dyssynergia, and it is a reflex, which means it is nobody's fault and it can be retrained.

It shows up as a belly that is flat in the morning and grows through the day no matter what you eat, and that goes down when you lie flat. The treatment is biofeedback with a therapist who knows the gut, and slow diaphragmatic breathing at home. This is the nervous system piece of bloating, and it is why the women who have been on alert for years so often carry it in the belly.

Bloating is a message from 5 places at once. You cannot answer it with one pill.

Food, and the test to run before you change it

Before anyone cuts gluten, I want a celiac test, and it only works if you are still eating gluten. The test is a tTG IgA antibody with a total IgA alongside, and you need to have been eating gluten in more than one meal a day for at least 6 weeks before the draw. If you go gluten free first, the test can read normal and you will never know. Celiac disease is treated for life and missed for decades, and bloating is one of its most common adult faces.

Once that is done, the low FODMAP diet has the best evidence of any food approach for bloating with IBS. Around half to three quarters of people get better in the restriction phase. It is a 2 to 6 week diagnostic diet, done with a dietitian, followed by reintroduction so you learn which 1 or 2 groups are yours. It is never a forever diet, and I do not run it with anyone who has a history of disordered eating, because a restriction diet is the wrong tool for that body. Lactose, fructose and sugar alcohols are the groups that catch most of my clients.

The thyroid and the panel

A slow thyroid slows the gut, and a thyroid tested at TSH alone can read normal while free T4 sits at the bottom of the range. If bloating comes with constipation, cold hands, a flat mood and a ferritin that gets called normal at 15, I want the full panel before I believe it is a food problem. I wrote about why in Issue 011.

The small intestinal bacterial overgrowth test, SIBO, comes up in every forum. The breath test is imperfect and the guidance reserves it for people with the right history, such as past gut surgery, diabetes or long term acid suppression. I do not chase it first.

What I would do first

I would sort out the bowel before anything else. Fiber up slowly with water, a 10 minute walk after your largest meal, and feet on a stool when you go. Give it 4 weeks.

I would track bloating, bowel movements and the cycle together for 2 cycles. Date, what you ate, how the belly looked at 8 in the morning and at 8 at night. The pattern tells me which layer to pull next.

I would eat slower and drop the air. Carbonated drinks, gum, straws and eating standing up all put air in. Sit, chew, 20 minutes a meal.

I would get the celiac test while still eating gluten, then decide about FODMAPs with a dietitian. Do not start restricting on your own.

I would practice 5 minutes of slow belly breathing twice a day, one hand on the chest and one on the belly, lower hand moving, upper hand still. If the belly grows through the day regardless of food, ask for a referral for biofeedback.

I would take the folder to your doctor with a request for ferritin, a full thyroid panel and the celiac screen. If you want the fiber and the meals laid out day by day, that is what the Whole Reset workbook does, at $49 with shipping, with 85 recipes tagged by goal. If you are pregnant, diabetic on medication or taking blood thinners, change the diet with your prescriber in the loop.

When to push harder with your doctor

Bloating most days for 3 weeks or more that is new to you needs an appointment before it needs a food diary. Ask for a pelvic exam, a transvaginal ultrasound and a CA 125 blood test, and say the words ovarian cancer out loud so it is written down. The signs that go with it are feeling full after a few bites, pelvic or belly pain, needing to pass urine more often or more urgently, and bloating that does not come and go.

Blood in the stool, black stools, unexplained weight loss, vomiting, a fever, or bloating with severe pain needs to be seen quickly.

If you are over 50 and bloating started for the first time, push for imaging rather than another elimination diet.

If a doctor says it is just IBS without a celiac test, a blood count and a thyroid panel, ask for those 3 before you accept the label.

FAQ

Why am I so bloated in perimenopause?

Estrogen swings make you hold water, progesterone slows the gut, and both make constipation more likely. Add a slower thyroid and years of a nervous system on alert and the belly is where it shows. Track it against your cycle for 2 cycles to see which part is hormonal.

Do probiotics help with bloating?

The current gastroenterology guidance says probiotics are not recommended for bloating or distension. Some people feel better on one and I do not argue with them. I would spend the money on fiber, a dietitian and a celiac test first.

Should I cut gluten to stop bloating?

Get the celiac test first, and you need to be eating gluten daily for at least 6 weeks before it. If you cut gluten before testing, the result can read normal and the diagnosis gets missed. After the test, a dietitian can run a proper trial.

What is abdominophrenic dyssynergia?

It is a reflex where the diaphragm drops and the belly wall relaxes outward in response to normal gas, so the belly distends through the day without extra gas inside. Lying flat often reduces it. Biofeedback with a gut focused therapist retrains it.

When is bloating a sign of something serious?

When it is new, present most days for 3 weeks or more, and comes with early fullness, pelvic pain, urinary urgency, weight loss or blood in the stool. Those need a pelvic exam, ultrasound and blood work. Persistent bloating after 50 is a reason to push.

In good health,
Yvette Rose

Sources

This is general wellness education and not medical advice, diagnosis or treatment. Talk to a qualified professional, especially if you are pregnant, nursing, taking medication or managing a condition.

It all starts in the gut.