When women think about menopause symptoms, hormones usually get all the attention. Estrogen and progesterone decline. Hot flashes begin. Sleep gets disrupted. Mood changes appear.
But emerging research suggests there may be another important player in the menopause transition that deserves attention: the vaginal microbiome.
Just as your gut contains trillions of microorganisms that influence digestion, immunity, and overall health, your vagina is home to its own unique microbial ecosystem. Researchers are increasingly finding that changes in this ecosystem may play a significant role in many of the symptoms women experience during perimenopause and menopause.¹
Meet Your Vaginal Microbiome
The vaginal microbiome is a community of bacteria, fungi (yes, fungi!), and other microorganisms that naturally inhabit the vagina. During the reproductive years, this ecosystem is typically dominated by beneficial bacteria known as the Lactobacillus species.
These bacteria play an important protective role. They produce lactic acid, which helps maintain an acidic vaginal environment with a pH typically between 3.5 and 4.5. This acidity helps suppress potentially harmful microorganisms and supports overall vaginal health.²,³
Think of Lactobacillus as the caretakers of the vaginal ecosystem. When they are thriving, they help maintain balance and create an environment that supports healthy tissues and natural defenses.
What Happens During Menopause?
One of estrogen's lesser-known jobs is supporting a healthy vaginal environment.
Estrogen stimulates the accumulation of glycogen within vaginal epithelial cells. Glycogen serves as an important fuel source for Lactobacillus bacteria, allowing them to produce lactic acid and maintain the acidic conditions that help protect vaginal health.²
As estrogen levels fluctuate and eventually decline during perimenopause and menopause, this support system begins to change.
Research shows that lower estrogen levels are associated with:
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Reduced glycogen availability
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Lower abundance of Lactobacillus species
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Higher vaginal pH
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Greater microbial diversity
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Increased colonization by anaerobic bacteria commonly associated with vaginal dysbiosis. ¹,⁵
While diversity is often considered beneficial in the gut microbiome, the opposite appears to be true in the vagina. Healthy reproductive-age vaginal microbiomes are generally characterized by low diversity and Lactobacillus dominance, whereas postmenopausal microbiomes often show greater bacterial diversity and fewer protective Lactobacillus species.⁵
Why These Changes Matter
For many women, menopause-related vaginal symptoms can feel confusing, frustrating, and surprisingly disruptive. Dryness. Burning. Irritation. Itching. Pain during sex. Recurrent urinary tract infections. Increased urinary urgency.
Historically, these symptoms have been attributed almost entirely to declining estrogen levels. But researchers now believe that changes in the vaginal microbiome may also contribute to what women are experiencing.¹
As Lactobacillus populations decline and vaginal pH rises, the protective environment that once supported vaginal and urinary health becomes less stable. This shift has been associated with increased susceptibility to vaginal discomfort, infections, and the collection of symptoms known as Genitourinary Syndrome of Menopause (GSM).⁴
In other words, menopause doesn't simply change hormone levels. It can reshape the entire vaginal ecosystem.
Can the Vaginal Microbiome Be Restored?
The encouraging news is that the vaginal microbiome appears to be highly responsive to hormonal changes and treatment. Studies have shown that estrogen therapy can help restore a healthier vaginal environment by increasing glycogen production, lowering vaginal pH, improving vaginal tissue health, and promoting the return of Lactobacillus-dominant microbial communities.²,⁵
Many women who use localized vaginal estrogen experience improvements in dryness, discomfort, urinary symptoms, and sexual function. Researchers believe that restoration of the vaginal microbiome may be one mechanism through which these benefits occur.⁵
Scientists are also investigating the potential role of probiotics and other microbiome-directed therapies. While early findings are promising, the evidence remains mixed, and more high-quality clinical trials are needed before these approaches can be recommended as standalone treatments for menopause-related symptoms.¹ If you have been diagnosed with bacterial vaginosis (a predominance of Garderella vaginalis and other bacteria that thrive in a high pH environment), you still may require vaginal antimicrobial therapy, along with vaginal estrogen, to restore the normal vaginal microbiome.
What This Means for Women Today
One of the most important takeaways from this research is that vaginal health during menopause is about more than hormones alone. The vaginal microbiome represents an exciting frontier in women's health research and may help explain why some women experience symptoms differently than others. It also reinforces the importance of addressing vaginal and urinary symptoms early rather than assuming they are simply an unavoidable part of aging.
If you're experiencing vaginal dryness, painful sex, recurrent urinary tract infections, irritation, or other intimate health concerns, know that effective treatment options exist. These symptoms are common, but they are not inevitable, and they are often highly treatable. And as always, connect with your healthcare provider to discuss your symptoms.
The Bottom Line
For decades, menopause-related vaginal symptoms were viewed almost exclusively through the lens of aging, and more recently, estrogen deficiency. Today, researchers are uncovering a more complete picture, one that includes the powerful influence of the vaginal microbiome.
As estrogen levels change, the vaginal ecosystem changes too. The decline in Lactobacillus, rise in vaginal pH, and shifts in microbial composition contribute to many of the symptoms women experience during the menopause transition.
Understanding that connection may help unlock new approaches to treatment, improve quality of life, and give women a clearer understanding of what's happening inside their bodies.
At HotPause Health, we believe that knowledge is power. The more we learn about menopause, the more we can move beyond simply managing symptoms and toward supporting women's health in a truly comprehensive way.
References
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Auriemma RS, Scairati R, del Vecchio G, Liccardi A, Verde N, Pirchio R, Pivonello R, Ercolini D and Colao A (2021) The Vaginal Microbiome: A Long Urogenital Colonization Throughout Woman Life. Front. Cell. Infect. Microbiol. 11:686167. doi: 10.3389/fcimb.2021.686167
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Amabebe E and Anumba DOC (2018) The Vaginal Microenvironment: The Physiologic Role of Lactobacilli. Front. Med. 5:181. doi: 10.3389/fmed.2018.00181
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France, M., Alizadeh, M., Brown, S. et al. Towards a deeper understanding of the vaginal microbiota. Nat Microbiol 7, 367–378 (2022). https://doi.org/10.1038/s41564-022-01083-2
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Micks E, Reed SD, Mitchell C. The Postmenopausal Vaginal Microbiome and Genitourinary Syndrome of Menopause. Clin Obstet Gynecol. 2024 Mar 1;67(1):79-88. doi: 10.1097/GRF.0000000000000832. Epub 2023 Nov 20. PMID: 38032828; PMCID: PMC10873068.
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Łaniewski, P., Herbst-Kralovetz, M.M. Connecting microbiome and menopause for healthy aging. Nat Microbiol 7, 354–358 (2022). https://doi.org/10.1038/s41564-022-01071-6
