Bloating gets all the airtime, and we've covered that ground already. But for many women in perimenopause, it is their bowel pattern itself that goes unpredictable, swinging between constipation and looser stools with no obvious trigger.
Why Pattern, Not Just Comfort, Changes
Oestrogen and progesterone receptors are present in the gastrointestinal tract, and research suggests these hormones may influence gut function, though most of the existing evidence comes from broader reviews of the oestrogen-microbiome relationship rather than dedicated studies of perimenopausal bowel changes [1]. Progesterone is thought to affect smooth muscle activity, and hormonal fluctuations during perimenopause may plausibly contribute to changes in gut motility and bowel patterns, though this specific link is not yet well established in dedicated clinical research [1]. For more on how hormones and gut health connect more broadly, see our related guide.
Definition: The estrobolome refers to the collection of gut bacteria capable of metabolising oestrogen, part of what makes up your gut microbiome. Research suggests it may play a role in how oestrogen is recycled in the body, creating a two-way relationship between gut bacteria and hormone levels [2]. Note: much of the estrobolome research base is still emerging, and findings should be treated as an evolving area rather than settled science.
Why It Feels So Inconsistent
Research has begun to examine gastrointestinal symptoms during perimenopause, including constipation, diarrhoea, and changes in bowel frequency, though a 2025 scoping review found that studies in this area remain limited in volume and often produce inconsistent findings [3]. During perimenopause, hormone levels fluctuate rather than changing in a simple, linear pattern, and these hormonal changes may affect gastrointestinal function. Our broader guide to gut health and perimenopause covers more of what is and isn't yet known, and our piece on gut health after 40 looks at the wider midlife picture.
Bloating vs Pattern Change: Two Different Signals
These two symptoms often get lumped together, but they're worth separating, and our guide on tracking bloating causes and patterns goes deeper on the first column below.
| Bloating | Bowel pattern change | |
|---|---|---|
| What it is | Discomfort, distension, gas | Frequency and consistency shifting |
| Often linked to | Water retention, fermentation, or food sensitivity | Possible link to hormone-related motility changes [1] |
| What may help | Meal timing, specific food triggers | Tracking pattern over weeks, not days |
This is a general comparison, not a diagnostic tool, the two often overlap and only a healthcare professional can assess an individual case.
Why a Single Week Will Not Capture This
Because perimenopausal pattern changes tend to unfold over weeks and months, a single bad week rarely tells you much. Passive, continuous tracking is designed to capture pattern and change over time instead, an idea we explore further in a month of noticing your gut, which is the specific gap Gutsi, a gut wellness tracker, was built to explore for women navigating this life stage. This is offered as context, not a promise of outcome.
Practical Takeaway
Changes in bowel habits can occur during the menopause transition, but a new or persistent change shouldn't automatically be attributed to hormones. A sudden or persistent change, unexplained weight loss, or blood in your stool is worth discussing with a GP. If constipation specifically has become a bigger issue for you, our piece on constipation in menopause goes into more depth.
If you want to start tracking your gut patterns, Gutsi's 7 Day Gut Reset is one place to begin.
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.
References
1. Baker, J. M., Al-Nakkash, L., & Herbst-Kralovetz, M. M. (2017). Estrogen-gut microbiome axis: Physiological and clinical implications. Maturitas, 103, 45-53.
2. Kwa, M., Plottel, C. S., Blaser, M. J., & Adams, S. (2016). The intestinal microbiome and estrogen receptor-positive female breast cancer. Journal of the National Cancer Institute, 108(8), djw029.
3. Shaw, N., Abbott, R., & Pettinger, C. (2025). The volume and characteristics of research on gastrointestinal symptoms in 'natural' peri- and postmenopause: A scoping review. Women's Health, 21, 17455057251387470.
