If you're gassier now than you were in your 30s, hormonal changes may be part of the picture. Oestrogen and progesterone can influence gut function, while changes in gut transit may affect how long bacteria have to ferment undigested carbohydrates and produce gas [1]. In other words, your diet may not be the only explanation.
August 18, 2026
The Real Reason You're Gassier in Perimenopause (and Why No One Warned You)
What actually happens to digestion during perimenopause?
Perimenopause is the transitional phase before periods stop completely. It can begin years before the final menstrual period and varies considerably from person to person [2]. Oestrogen and progesterone both appear to influence the smooth muscle that moves food through the gut, and it's a stage that often brings other shifts too, including changes some women notice in their cortisol rhythm. As hormone levels fluctuate during perimenopause, some women may notice changes in gut function and bowel patterns.
Why slower transit may mean more gas
When food moves through the colon more slowly, resident bacteria have more time to break down fibre and undigested carbohydrates. Gas is a normal byproduct of that fermentation, and it often shows up alongside bloating too. This is a feature of how the gut works, not a sign that something has gone wrong. Many women never connect the timing to hormones simply because nobody mentions it.
Is it just gas, or something else?
Occasional gas is common, and some women may notice that symptoms change alongside hormonal or menstrual changes. It's worth speaking to a GP if gas comes with persistent pain, unexplained weight loss, blood in your stool, or a real change in how often you're going that lasts more than a few weeks [3].
Gas patterns that can overlap with perimenopause and IBS
| Pattern | May occur during perimenopause | Can occur with IBS |
|---|---|---|
| Timing | May coincide with hormonal changes | May fluctuate with food, stress or bowel movements |
| Onset | Can develop alongside other perimenopause symptoms | Can begin at any age |
| Other symptoms | May occur alongside bloating or bowel changes | Often occurs alongside abdominal pain and changes in bowel habits |
These patterns can overlap, so they aren't a way to diagnose the cause of your symptoms. Speak to a GP if you're concerned.
Tracking patterns instead of guessing
Most gut health tools offer an occasional snapshot: a single test, a one-off log. Passive, continuous tracking works differently, building a picture of your own patterns over weeks rather than reacting to any single day, which may make it easier to notice whether gut changes coincide with hormonal shifts.
Practical takeaway: If gas has crept up alongside other perimenopause symptoms, hormones may be part of the explanation. Note timing rather than obsessing over specific foods, flag anything persistent or unusual to your GP, and stop treating this as a personal failing.
Curious about your own gut patterns? Gutsi's Gut Quiz may be a good place to start.
References
1. Mulak, A., Taché, Y., & Larauche, M. (2014). Sex hormones in the modulation of irritable bowel syndrome. World Journal of Gastroenterology, 20(10), 2433–2448. Note: review-level evidence; hormone-motility links are still developing.
2. NHS. (2023). Menopause. nhs.uk/conditions/menopause
3. NHS. (2023). Flatulence. nhs.uk/conditions/flatulence
This content is for informational purposes only and does not constitute medical advice. If you have concerns about your digestive health, please speak to a healthcare professional.
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