Thyropause: How Does Perimenopause Trigger Thyroid Disease?

Why Thyroid Health Deserves Attention During the Menopausal Transition

Many women entering their 40s begin to notice changes in their health.

Fatigue that doesn't improve with rest, brain fog, weight gain despite eating well, hair thinning, dry skin and heavy or irregular periods are often dismissed as "just perimenopause."

While these symptoms are common during the menopausal transition, they are not always caused by changing reproductive hormones alone.

For some women, thyroid dysfunction—particularly autoimmune thyroid disease such as Hashimoto's thyroiditis—may also be contributing to how they feel.

The challenge is that the symptoms of perimenopause, thyroid dysfunction and even insulin resistance often overlap, making it difficult to recognise what is really happening.

Some integrative medicine practitioners use the term "thyropause" to describe this overlap between perimenopause and hypothyroidism. Although thyropause is not an official medical diagnosis, it is a useful concept that highlights the close relationship between hormonal changes, immune function and thyroid health during midlife.

Rather than asking:

"Is it menopause or my thyroid?"

A better question may be:

"Could more than one factor be contributing to my symptoms?"

Thyropause: How Does Perimenopause Trigger Thyroid Disease?

What is Thyropause?

Thyropause is a descriptive term used by some healthcare practitioners to explain the overlap between:

• perimenopause

• thyroid dysfunction

• autoimmune thyroid disease

It recognises that many women first develop thyroid symptoms during the menopausal transition.

This does not mean that perimenopause directly causes thyroid disease. Instead, hormonal changes, ageing, genetics, immune function and lifestyle factors may all interact during this stage of life.

Looking at the whole clinical picture can help guide appropriate medical assessment and personalised nutrition support.

Understanding Perimenopause

Perimenopause is the transitional stage leading up to menopause.

It commonly begins during a woman's 40s but may start earlier or later.

During this time the ovaries gradually change hormone production.

Rather than declining steadily, oestrogen levels often fluctuate significantly while progesterone gradually decreases.

These hormonal changes affect far more than the menstrual cycle.

Oestrogen and progesterone influence:

• brain function

• metabolism

• bone health

• cardiovascular health

• immune regulation

• sleep

• mood

• muscle function

• thyroid hormone transport

Because these hormones interact with many body systems, symptoms can vary greatly between women.

Why Does Thyroid Disease Become More Common During Midlife?

Women are around five to eight times more likely than men to develop thyroid disease.

Hashimoto's thyroiditis is the most common cause of hypothyroidism in Australia and other Western countries.

Researchers believe several factors contribute to the increased risk during midlife.

1. Hormonal Changes

Sex hormones influence immune function and thyroid hormone regulation.

During perimenopause, fluctuating oestrogen and declining progesterone may alter the way the body responds to thyroid hormones.

Women already taking thyroid medication may notice changes in their thyroid requirements during this stage of life.

Regular monitoring with a GP is important.

2. Immune System Changes

The immune system naturally changes with age.

Current research suggests hormonal transitions may influence immune regulation in genetically susceptible individuals.

Hashimoto's thyroiditis develops when the immune system mistakenly attacks thyroid tissue, gradually reducing thyroid hormone production.

Not every woman experiencing perimenopause will develop autoimmune thyroid disease, but the incidence increases during midlife.

3. Insulin Resistance

Insulin resistance also becomes more common during perimenopause.

Changing hormones, reduced muscle mass, altered body composition and lifestyle factors may all contribute.

Interestingly, many symptoms overlap with both thyroid dysfunction and perimenopause.

Why Are Symptoms So Similar?

One reason thyroid disease is frequently overlooked during perimenopause is because the symptoms are remarkably similar.

Common overlapping symptoms include:

• Fatigue

• Brain fog

• Weight gain

• Hair thinning or hair loss

• Heavy or irregular periods

• Elevated cholesterol

• Constipation

• Feeling cold

• Dry skin

• Muscle aches

• Poor concentration

• Reduced exercise tolerance

These symptoms are not specific to one condition.

They may be influenced by:

• perimenopause

• hypothyroidism

• insulin resistance

• iron deficiency

• vitamin B12 deficiency

• vitamin D deficiency

• poor sleep

• chronic stress

• other medical conditions

For this reason, persistent symptoms should not automatically be attributed to menopause alone.

The Connection Between Perimenopause, Thyroid Disease and Insulin Resistance

One of the most helpful ways to understand thyropause is to view these conditions as overlapping circles rather than isolated problems.

Many women experience more than one contributing factor simultaneously.

For example:

• Perimenopause may influence metabolism and body composition.

• Insulin resistance may contribute to weight gain and fatigue.

• Thyroid dysfunction may affect energy levels, cholesterol and hair health.

Rather than asking which condition is responsible, healthcare practitioners aim to identify which factors may be contributing to an individual's symptoms.

Could It Be Hashimoto's Thyroiditis?

Hashimoto's thyroiditis is an autoimmune condition in which the immune system gradually damages thyroid tissue.

Over time this may reduce thyroid hormone production and lead to hypothyroidism.

Hashimoto's often develops slowly.

In many people, thyroid antibodies are present years before thyroid hormone levels become abnormal.

Symptoms may include:

• persistent fatigue

• brain fog

• dry skin

• constipation

• feeling cold

• hair thinning

• weight changes

• heavy menstrual bleeding

• elevated cholesterol

These symptoms overlap considerably with perimenopause.

What Tests Might Your GP Consider?

If thyroid dysfunction is suspected, your GP may consider appropriate investigations based on your symptoms and medical history.

These may include:

Thyroid function

• TSH

• Free T4

• Free T3 (when clinically indicated)

Autoimmune thyroid disease

• Thyroid peroxidase antibodies (TPOAb)

• Thyroglobulin antibodies (TgAb)

Depending on your presentation, your GP may also consider:

• Iron studies (including ferritin)

• Vitamin B12

• Folate

• Vitamin D

• Lipid profile

• HbA1c or other investigations where clinically appropriate

The most suitable investigations vary between individuals.

Understanding TSH

TSH (thyroid-stimulating hormone) is produced by the pituitary gland.

When thyroid hormone levels fall, the pituitary produces more TSH to stimulate the thyroid.

Generally:

• Higher TSH may suggest reduced thyroid function.

• Lower TSH may suggest increased thyroid activity.

However, thyroid assessment is never based on TSH alone.

Healthcare professionals also consider:

• Free T4

• symptoms

• thyroid antibodies

• medical history

• previous blood tests

• medications

• pregnancy status where relevant

Can Thyroid Medication Requirements Change During Perimenopause?

For women already taking levothyroxine, the answer is sometimes yes.

One reason relates to a protein called thyroxine-binding globulin (TBG).

Higher oestrogen levels increase TBG.

This protein binds thyroid hormone in the bloodstream, leaving less available in its free form.

For some women, this may influence thyroid medication requirements, particularly when starting oral menopausal hormone therapy.

Regular thyroid function testing allows medication doses to be adjusted when necessary.

Medication changes should always be guided by the prescribing doctor.

Why Do Some People Continue to Experience Symptoms?

Levothyroxine (T4) is the recommended first-line treatment for hypothyroidism and is highly effective for most people.

However, some individuals continue to experience symptoms despite blood tests within the target range.

Persistent symptoms do not necessarily mean thyroid medication is ineffective.

Other contributing factors may include:

• iron deficiency

• vitamin B12 deficiency

• vitamin D deficiency

• sleep disorders

• stress

• insulin resistance

• perimenopause

• other medical conditions

A comprehensive assessment helps identify potential contributing factors rather than assuming every symptom is thyroid related.

The Gut–Thyroid Axis: An Emerging Area of Research

Research continues to explore the relationship between the gut microbiome, immune system and thyroid health.

Scientists are investigating how the gut microbiome may influence:

• immune regulation

• intestinal barrier function

• inflammation

• nutrient absorption

• thyroid hormone metabolism

Although research is promising, nutrition should not be viewed as a treatment for autoimmune thyroid disease.

Supporting gut health through a varied, fibre-rich diet may contribute to overall wellbeing and digestive health.

Gluten and Hashimoto's

Gluten is one of the most discussed topics in thyroid nutrition.

There is strong evidence that people with Hashimoto's have a higher prevalence of coeliac disease than the general population.

If coeliac disease is suspected, appropriate testing should be discussed with your GP before removing gluten from your diet.

For individuals without coeliac disease, current research is mixed.

Nutrition recommendations should always be individualised based on symptoms, dietary intake, medical history and appropriate investigations.

Selenium and Thyroid Health

Selenium is an essential trace mineral involved in:

• normal thyroid hormone metabolism

• antioxidant defence

• immune function

Some clinical studies have investigated selenium supplementation in autoimmune thyroid disease, with mixed findings.

Routine supplementation is not appropriate for everyone.

If supplementation is being considered, it should be discussed with your healthcare practitioner because excessive selenium intake can be harmful.

What About Iodine?

Iodine is essential for the production of thyroid hormones.

However, more is not always better.

In Australia, iodine deficiency is less common due to food fortification.

For people with autoimmune thyroid disease, excessive iodine intake may worsen thyroid autoimmunity in susceptible individuals.

For this reason, iodine supplements should only be used under medical supervision unless specifically recommended by your doctor.

Supporting Your Health During Perimenopause

Although no specific diet has been proven to prevent or cure thyroid disease, healthy lifestyle habits can support overall wellbeing.

Practical strategies include:

• Eating adequate protein at each meal to support muscle health and healthy ageing.

• Including plenty of colourful vegetables, fruit, legumes and wholegrains (unless medically advised otherwise).

• Consuming healthy fats from foods such as extra virgin olive oil, nuts, seeds and oily fish.

• Supporting gut health with a variety of fibre-rich plant foods and fermented foods where tolerated.

• Prioritising sleep and stress management.

• Participating in regular resistance training and physical activity.

• Working with your GP, endocrinologist and accredited healthcare practitioner to develop an individualised management plan.

When Should You Speak With Your GP?

If you are experiencing persistent symptoms such as:

• fatigue

• brain fog

• unexplained weight gain

• hair thinning

• heavy menstrual bleeding

• elevated cholesterol

• constipation

• feeling unusually cold

it is worth discussing these with your GP.

Appropriate assessment may help determine whether thyroid function, nutritional status, perimenopause or another health condition could be contributing to your symptoms.

The Take-Home Message

Perimenopause is a significant hormonal transition that affects many systems throughout the body.

For some women, thyroid dysfunction may also develop during this time, contributing to symptoms that are often mistaken for menopause alone.

Although "thyropause" is not an official medical diagnosis, it is a useful concept that reminds us to look at the whole picture rather than assuming there is a single explanation for every symptom.

Understanding the relationship between perimenopause, thyroid health, insulin resistance, nutrition and lifestyle allows for more informed conversations with your healthcare team.

If you're experiencing persistent symptoms, don't ignore them or assume they're simply part of ageing.

Working with your GP and appropriately qualified healthcare practitioners can help identify contributing factors and develop a personalised management plan that supports your overall health and wellbeing.

References

Briden L. Hormone Repair Manual. 2024.

Australian Thyroid Foundation.

American Thyroid Association. Guidelines for the Treatment of Hypothyroidism.

European Thyroid Association. Guidelines for the Management of Hypothyroidism.

McLeod DSA, Cooper DS. The incidence and prevalence of thyroid autoimmunity. Endocrine. 2012.

Winther KH, et al. Selenium supplementation in autoimmune thyroiditis: A systematic review and meta-analysis. Thyroid. 2020.

About the Author

Aleksandra (Ola) Krawczyk is an ATMS Accredited Clinical Nutritionist, SIBO Certified Nutritionist and Microba Certified Microbiome Practitioner. She has a special interest in gut health, thyroid health, perimenopause and personalised nutrition.

Ola provides evidence-informed nutrition support alongside your healthcare team through online consultations across Australia.

Disclaimer

This article is intended for educational purposes only. It is not intended to diagnose, treat, cure or prevent any medical condition and should not replace personalised medical advice. If you have concerns about your thyroid health, symptoms during perimenopause or your medications, please consult your GP, endocrinologist or another appropriately qualified healthcare professional before making changes to your diet, supplements or prescribed treatment.