Perimenopause and Digestion: What Researchers Know So Far
Posted by The CodonRX Science Team on Oct 20th 2026
Some women notice that digestion starts to feel less predictable in their 40s, with more bloating, constipation, or new food sensitivities. Some health organizations link these changes to perimenopause, while others describe perimenopause mostly in terms of sleep, mood, and bones. Researchers are studying whether hormones and gut bacteria influence each other — and where the science stands is more limited than many articles suggest.
What Is Perimenopause?
The Office on Women’s Health describes perimenopause as the time before menopause when hormone levels change. During this transition, estrogen and progesterone fluctuate before settling at lower levels after menopause. The transition can last several years, and it can affect sleep, mood, bones, joints, bladder, and weight, among other things.1,2
How Might Hormones Influence the Gut?
Researchers and some health organizations describe several ways that estrogen and progesterone could affect digestion. These are proposed explanations, and the evidence behind them is still developing.
Gut bacteria
Some reviews describe a two-way relationship between sex hormones such as estrogen and the bacteria that live in the gut. Hormones may help shape which bacteria are present, and gut bacteria may influence how the body handles estrogen.3 Scientists use the word “estrobolome” for the group of gut bacteria that help process estrogen. The Canadian Digestive Health Foundation notes that lower diversity of gut bacteria has been linked to bloating and slower digestion, and that estrogen is thought to help maintain diversity.2
How quickly food moves
The Canadian Digestive Health Foundation also describes declining estrogen and progesterone as possibly slowing the movement of food through the intestines, which could contribute to constipation and a feeling of incomplete emptying.2 This may help explain why some women notice bowel changes even when their diet has not changed.
Why Digestive Symptoms May Have More Than One Cause
The Canadian Digestive Health Foundation describes the picture as “multi-factorial,” meaning hormones are only one piece. It points to three other things that often change in midlife:2
- Sleep. Poor sleep can affect gut-brain communication, appetite, and how the gut moves.
- Stress. Hormonal ups and downs may make some people more reactive to stress, and stress can bring on bloating or urgency.
- Routine and eating patterns. Fatigue and busy schedules can lead to skipped meals, late snacking, or changes in fibre.
The American College of Obstetricians and Gynecologists (ACOG) notes that bloating can be a side effect of hormone therapy.5 Other things can also cause digestive symptoms, including thyroid problems and some medications.2
At a Glance
- What changes: Estrogen and progesterone fluctuate during perimenopause, a transition that can last several years
- What researchers are studying: Whether hormones and gut bacteria influence each other, and whether hormone changes affect how quickly food moves through the gut
- Strength of the evidence: Limited. Reviews say the mechanisms are not well understood and call for more long-term studies
- What it means: Digestive changes in midlife have many possible causes. New or worrying symptoms are worth discussing with your provider
Everyday Habits the Canadian Digestive Health Foundation Describes
The Foundation suggests the following. These are general habits, not treatments, and its page does not cite studies for them.2
- Regular meals: three to four evenly spaced meals a day, and avoiding long gaps without eating.
- Sleep and stress: a consistent bedtime routine, plus short breaks and light movement such as a 5 to 10 minute walk.
- Fibre, added gradually: soluble fibre such as oats, chia seeds, and cooked vegetables, with plenty of fluids. Added fibres such as inulin or chicory root may worsen bloating in sensitive guts.
- Plant variety and fermented foods: a variety of plant foods, and fermented foods such as yogurt or kefir “if tolerated.”
When Should You Talk to Your Provider?
The National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) advises seeing a doctor if constipation does not improve with self-care, or if you have a family history of colon or rectal cancer.6
The Canadian Digestive Health Foundation adds that it is worth raising new bowel changes with a provider before making major diet or supplement changes. Some medications and supplements, including iron, calcium, and certain antidepressants, can slow digestion or irritate the gut, and it suggests discussing colorectal cancer screening after age 45.2
NIDDK advises seeking care right away if constipation comes with any of the following:6
- Rectal bleeding or blood in the stool
- Constant abdominal pain
- Inability to pass gas
- Vomiting
- Fever
- Lower back pain
- Losing weight without trying
A Note on Probiotics
Probiotics are one of the areas researchers are looking at in menopause. The evidence is limited, and products differ a great deal. Strain, dose, and storage all matter. Our guide to reading a probiotic label explains how to compare them.
Questions Women Ask
Is a change in digestion a sign that something is wrong?
Digestive changes have many possible causes. New or worrying symptoms are worth discussing with your healthcare provider.
Can I take a supplement with hormone therapy or other medications?
If you take prescription medications or have a medical condition, consult your healthcare provider before starting any supplement.
Is keeping track of symptoms helpful?
A simple log over a few weeks can help you and your provider look for patterns. The free CodonRX app includes a symptom log, though it is not a medical device.
References & Notes
- Office on Women’s Health. “Menopause basics.” womenshealth.gov. womenshealth.gov/menopause/menopause-basics. Describes perimenopause as the time before menopause when hormone levels change, and lists the body systems menopause can affect.
- Lovink R. “Understanding Perimenopause and Gut Health.” Canadian Digestive Health Foundation. Updated October 13, 2026. cdhf.ca/en/understanding-perimenopause-and-gut-health. A patient-education page describing possible effects of hormone changes on gut bacteria and motility, and the roles of sleep, stress, and routine. No reviewer is named and most claims are uncited.
- Liaquat M, Minihane AM, Vauzour D, Pontifex MG. “The gut microbiota in menopause: Is there a role for prebiotic and probiotic solutions?” Post Reproductive Health. 2025;31(2):105–114. doi:10.1177/20533691251340491. A review concluding that gut microbiota may influence hormonal balance and menopausal symptoms, that the mechanisms are unclear, and that most evidence is observational.
- Peters BA, Santoro N, Kaplan RC, Qi Q. “Spotlight on the Gut Microbiome in Menopause: Current Insights.” International Journal of Women’s Health. 2022;14:1059–1072. doi:10.2147/IJWH.S340491. A review linking menopause and low estrogen to lower gut microbiome diversity, noting that the findings rest on small, varied studies and larger studies are needed.
- American College of Obstetricians and Gynecologists. “Hormone Therapy for Menopause.” ACOG Patient FAQs. acog.org/womens-health/faqs/hormone-therapy-for-menopause. Patient guidance on hormone therapy, including bloating as a possible side effect.
- National Institute of Diabetes and Digestive and Kidney Diseases. “Symptoms & Causes of Constipation.” NIDDK. niddk.nih.gov/health-information/digestive-diseases/constipation/symptoms-causes. Lists when to see a doctor and the warning signs that call for immediate care.