Could SIBO Be Worsening Your Perimenopause Symptoms?

OlaKrawczyk
May 27
3 min read

Many women entering perimenopause notice changes in digestion alongside hormone-related symptoms.

You may experience:

bloating after meals
constipation
reflux
food sensitivities
fatigue
brain fog
worsening PMS-like symptoms
changes in skin or mood

For some individuals, underlying digestive dysfunction such as Small Intestinal Bacterial Overgrowth (SIBO) may be one contributing factor.

SIBO Perimenopause — Could SIBO Be Worsening Your Perimenopause Symptoms?

What is SIBO?

SIBO stands for Small Intestinal Bacterial Overgrowth.

It occurs when bacteria that normally reside primarily in the large intestine become overgrown in the small intestine.

This may contribute to symptoms such as:

bloating
excessive gas
abdominal discomfort
reflux
constipation or diarrhoea
altered bowel habits

Symptoms are often noticed shortly after eating, particularly after foods high in fermentable carbohydrates.

Why can digestive symptoms change during perimenopause?

Perimenopause involves significant hormonal and physiological changes that may influence digestive function and the gut microbiome.

Factors that may affect gut health during this time can include:

stress
sleep disruption
changes in gut motility
dietary patterns
medication use
reduced physical activity
hormonal fluctuations

Researchers are increasingly exploring the relationship between hormonal changes, the gut microbiome and gastrointestinal function during perimenopause.

SIBO, estrogen metabolism and the gut microbiome

The gut microbiome plays an important role in digestion, immune signalling and estrogen metabolism.

Healthy bowel function and microbial balance help support the removal of metabolised estrogen from the body.

When digestive function and microbiome balance are disrupted, this process may also be affected.

Some clinicians and researchers are exploring whether gut dysbiosis and conditions such as SIBO may contribute to:

altered estrogen metabolism
increased inflammatory signalling
digestive symptoms during perimenopause

This relationship is complex and highly individual, and more research is continuing to emerge in this area.

The possible connection between SIBO, histamine and mast cells

Some individuals with digestive dysfunction may also experience symptoms commonly associated with histamine sensitivity or mast cell activation.

Possible symptoms may include:

flushing
headaches
skin irritation
sinus congestion
palpitations
anxiety
sleep disturbances
food sensitivities

Certain gut bacteria may influence histamine activity within the body, which is one reason why gut health and microbiome balance are increasingly being explored in relation to inflammation and immune function.

There is also growing interest in the relationship between fluctuating estrogen levels, histamine activity and perimenopause symptoms in some individuals.

SIBO and thyroid health

Thyroid health and digestive function are closely interconnected.

Reduced gut motility may increase susceptibility to bacterial overgrowth in some individuals.

At the same time, digestive symptoms and ongoing inflammation may affect overall wellbeing and quality of life.

Some individuals with hypothyroidism may experience overlapping symptoms with SIBO, including:

constipation
bloating
fatigue
sluggish digestion

This is why a comprehensive and personalised assessment is important.

Common signs that may warrant further investigation

Some symptoms that may suggest a need for further digestive assessment include:

bloating shortly after meals
excessive gas
chronic constipation or diarrhoea
reflux
food sensitivities
ongoing digestive discomfort
worsening digestive symptoms during perimenopause

SIBO is commonly assessed using a breath test measuring gases such as hydrogen and methane after ingestion of a test substrate.

You can find more information about SIBO breath testing here:

https://www.sibotest.com/

Supporting digestive health during perimenopause

Supporting digestive health may involve:

improving dietary quality
supporting bowel regularity
stress management
prioritising sleep
regular movement and exercise
identifying individual food triggers where appropriate
supporting microbiome diversity

Some individuals may also benefit from personalised nutrition support and further investigation where symptoms persist.

What about gut microbiome testing?

In some cases, gut microbiome testing may also provide helpful insight into the broader gut ecosystem, including microbial diversity, digestive markers and selected gut health indicators.

While microbiome testing does not diagnose SIBO, it may help provide additional information about gut health patterns that can be interpreted alongside symptoms, diet, health history and other pathology where appropriate.

You can learn more about gut microbiome testing here: https://microba.com/

For personalised support, microbiome results should always be interpreted in clinical context with a qualified practitioner.

Final thoughts

Perimenopause symptoms are complex and rarely related to one single factor.

Hormones, digestion, inflammation, stress, microbiome balance and lifestyle factors may all interact together.

For some women, addressing digestive health and exploring possible contributors such as SIBO may provide valuable insight into ongoing symptoms.

A personalised and evidence-informed approach is always important.