Menopause Explained: Hormonal Changes, Perimenopause Symptoms, and HRT from a Functional Medicine Perspective

Written by Guest Author, Monique Class, MS, APRN-BC, IFMCP

The transition can feel like a slow-motion fog rolling in. One day you’re fine, and the next you can’t find your keys, you’re waking up drenched in sweat, and your mood swings are giving you whiplash. You turn to the internet for answers and find a confusing whirlwind of conflicting advice, superficial lists of the “top 5 symptoms,” and aggressive marketing for miracle cures. It’s frustrating, isolating, and leaves you feeling unheard.

Here’s the truth: you are not losing your mind, and you don’t have to “just live with it.” Menopause is a profound biological shift, but it’s a manageable one. This guide is different. From a functional medicine perspective, we see you as a whole person, not just a collection of symptoms. We are here to decode the science, validate every single one of your experiences—from brain fog to body aches—and provide an unbiased, evidence-based framework for choosing the right path for you.

Whether you’re considering Hormone Replacement Therapy (HRT), natural remedies, lifestyle changes, or a combination, this article will give you the clarity and confidence you need. We will explore:

• The foundational science of what’s really happening to your hormones.
• A comprehensive, head-to-toe guide to the full spectrum of menopause symptoms.
• The functional medicine view on why your journey is unique.
• A complete and objective look at all your management options, from nutrition to HRT.
• A practical toolkit for making an informed, empowered decision with your doctor.

The Science of the Shift: What Really Happens to Your Hormones During Menopause?

To navigate menopause, you first have to understand the underlying hormonal symphony and why it’s changing its tune. The menopausal transition, or perimenopause, begins years before your final menstrual period as your ovaries gradually reduce their production of key hormones. This isn’t a simple on/off switch; it’s a series of fluctuations that create a cascade of effects throughout your entire body.

Think of it like a conversation. For years, your brain’s pituitary gland has been sending signals—Follicle-Stimulating Hormone (FSH) and Luteinizing Hormone (LH)—to your ovaries, asking them to produce estrogen and progesterone. As the ovaries become less responsive with age, the pituitary gland has to “shout louder” to be heard. This is why a key diagnostic marker for menopause is a sustained high level of FSH in the blood. Your brain is calling for estrogen, but the ovaries are no longer answering.

This leads to a decline in the primary reproductive hormones, but also a fundamental shift in the type of estrogen your body relies on. As prominent menopause researcher Dr. Nanette Santoro explains, the reproductive hormonal changes during this time can precipitate “bothersome vasomotor symptoms, mood disruption, temporary cognitive dysfunction, genitourinary symptoms, and other disease processes”[2]. After menopause, the body’s main estrogen shifts from the potent estradiol (E2) produced by the ovaries to a weaker form called estrone (E1), which is produced in fat tissue. This change in hormonal power and profile is central to the menopausal experience. For a foundational overview of the stages, the National Institute on Aging Menopause Guide is an excellent starting point.

The Role of Estrogen (Estradiol, Estrone, Estriol)

Estrogen is so much more than a reproductive hormone. Your body has estrogen receptors in the brain, heart, bones, skin, and urinary tract, which is why its decline causes such widespread symptoms. According to the Cleveland Clinic, this single hormonal change is the primary driver of most menopausal effects[1].

• Brain: Estrogen helps regulate mood, temperature (thermoregulation), and cognitive function.
• Bones: It is critical for maintaining bone density by slowing the breakdown of old bone.
• Heart & Blood Vessels: It has a protective effect on cardiovascular health.
• Skin: It stimulates the production of collagen and natural oils, keeping skin firm and hydrated. Its decline leads to drier, thinner skin[3].
• Urinary Tract: It keeps the tissues of the vagina and urethra healthy and elastic.

Progesterone: The Calming Hormone’s Departure

Often called the “calming” hormone, progesterone plays a key role in balancing estrogen, regulating the menstrual cycle, and preparing the body for pregnancy. Crucially, it also has a soothing effect on the brain by interacting with GABA receptors, the same receptors targeted by anti-anxiety medications.

During perimenopause, progesterone levels often drop first and more dramatically than estrogen, leading to symptoms like:

• Irregular or heavier periods
• Increased anxiety or irritability
• Menopause sleep disturbances, as its calming influence wanes[4].

The Overlooked Player: Testosterone’s Decline

While estrogen and progesterone get most of the attention, testosterone levels also decline gradually as a woman ages. This is a critical and often-missed piece of the menopause puzzle. Testosterone in women is vital for:

• Energy and vitality
• Libido and sexual response
• Maintaining muscle mass and bone density
• Mood and cognitive function

While testosterone replacement for women is still considered “off-label” in many places, The North American Menopause Society (NAMS) acknowledges its potential benefits for low libido, and many functional and integrative practitioners consider it an essential part of a comprehensive hormone strategy[5].

Beyond Hot Flashes: A Head-to-Toe Guide to Menopause Symptoms

One of the most frustrating parts of menopause is the sheer breadth of symptoms that can appear, many of which you may not realize are connected to your hormones. Competitors often list the top few, but we know your experience is more complex. The following is a comprehensive guide to validate what you’re feeling.

Vasomotor Symptoms: Hot Flashes and Night Sweats

These are the classic, hallmark symptoms of menopause. Caused by the effect of estrogen withdrawal on the brain’s temperature-control center (the hypothalamus), a hot flash is a sudden feeling of intense heat, often accompanied by a flushed face and sweating. When they happen at night, they’re called night sweats and can severely disrupt sleep. Hormone therapy remains the most effective treatment for these vasomotor symptoms (VMS)[5].

Cognitive & Emotional Changes: Brain Fog, Memory, Mood, and Anxiety

If you feel like you’re losing your mind, you’re not alone. Research shows that around 60% of women in the menopause transition report experiencing “brain fog”[6]. This is not just a feeling; studies confirm there are small but real declines in verbal memory and processing speed during this time[2]. The good news is that for most women, this is temporary.

It’s crucial to distinguish this from more serious conditions.

*Source: Adapted from information provided by the Mayo Clinic News Network[6].

Sleep Disturbances: More Than Just Night Sweats

Up to 69% of menopausal women report significant sleep disturbances, making it one of the most common and disruptive issues[15]. While night sweats are a major culprit, they aren’t the only cause. The decline in calming progesterone, coupled with increased anxiety, can make it difficult to fall asleep and stay asleep, even on nights when you aren’t sweating.

This creates a vicious cycle: poor sleep can worsen other menopause symptoms like brain fog, mood swings, and fatigue. For chronic insomnia, one of the most effective, evidence-based non-hormonal treatments is Cognitive Behavioral Therapy for Insomnia (CBT-I), which helps retrain your brain and behaviors for better sleep.

Physical Symptoms: Aches, Skin Changes, Weight Shifts, and More

• Aches and Pains: Many women report an increase in joint and muscle aches, which may be related to estrogen’s role in managing inflammation.
• Skin and Hair: As estrogen and collagen decline, skin can become drier, thinner, and more prone to wrinkles. Hair may also become thinner and more brittle.
• Weight and Metabolism: Your metabolism naturally slows with age, and the decline in estrogen causes a shift in fat storage from the hips and thighs to the abdomen.

Genitourinary Syndrome of Menopause (GSM): Vaginal Dryness and Bladder Issues

This is an incredibly common but often under-reported symptom. The American College of Obstetricians and Gynecologists (ACOG) explains that low estrogen causes the tissues of the vagina and urinary tract to become thinner, drier, and less elastic[9]. This can lead to:

• Vaginal dryness, itching, and burning
• Pain during sexual intercourse
• Increased urgency to urinate
• More frequent urinary tract infections (UTIs)

A Functional Medicine Approach: Why Your Menopause Journey is Unique

In conventional medicine, menopause is often viewed as a simple state of estrogen deficiency. In functional medicine, we see it as a systems-wide event. Your hormonal transition doesn’t happen in a vacuum; it’s profoundly influenced by your genetics, lifestyle, gut health, stress levels, and nutritional status. This is why two women of the same age can have vastly different menopause experiences.

As a functional medicine physician, my goal is to understand your unique biology. We look upstream to identify the factors that may be amplifying your symptoms. The Institute for Functional Medicine (IFM) provides a framework for this, looking at how core imbalances can intersect with hormonal changes[10]. Key areas we investigate include:

The Gut-Hormone Connection (The Estrobolome)

Did you know your gut plays a critical role in hormone balance? A specific collection of gut bacteria, known as the “estrobolome,” produces an enzyme that helps process and circulate estrogen in the body. If your gut health is compromised (a condition known as dysbiosis), your estrobolome may not function properly, leading to either an excess or deficiency of estrogen and worsening symptoms [7].

Stress, Cortisol, and the Adrenal-Ovarian Axis

When you are under chronic stress, your body prioritizes the production of the stress hormone cortisol. The building block for cortisol is a precursor hormone called pregnenolone, which is also used to make progesterone and other sex hormones. In a state of high stress, the body can divert pregnenolone away from sex hormone production to make more cortisol—a phenomenon known as “pregnenolone steal” or “cortisol steal.” This can deplete your already declining progesterone levels, amplifying symptoms like anxiety, insomnia, and fatigue.

Your Complete Guide to Management: From Lifestyle to Hormone Therapy

Once you understand the “why” behind your symptoms, you can explore the “how” of managing them. The best approach is personalized and often involves a combination of strategies.

Foundational Support: Nutrition, Exercise, and Stress Reduction

These are the non-negotiable pillars of a healthy menopause.

• Nutrition: Adopting a Mediterranean-style diet, rich in fiber, healthy fats, lean protein, and colorful vegetables, is highly beneficial for heart, bone, and brain health[11]. Including foods with plant estrogens (phytoestrogens) like flaxseeds, chickpeas, and organic soy may offer mild symptom relief. Working with a Functional Nutritionist can better support these diet changes to ensure you are getting the nutrients your body needs.
• Exercise: A combination of exercise is ideal.
  • Strength Training: Builds bone density and muscle mass, which boosts metabolism.
  • Cardio/HIIT: Supports cardiovascular health and helps manage weight.
  • Yoga/Stretching: Reduces stress, improves flexibility, and can help with mood.
• Stress Reduction: Simple practices can have a profound impact. Try a “box breathing” exercise: inhale for a count of 4, hold for 4, exhale for 4, and hold for 4. Repeat for 2-3 minutes to calm your nervous system during a moment of stress or a hot flash.

An Evidence-Based Guide to Menopause Supplements

The supplement aisle can be overwhelming. While many products make big promises, the evidence varies. It’s crucial to approach supplements with a critical eye and always discuss them with your provider. 

Important Disclaimer: Always consult your doctor before starting any supplement, as they can interact with medications and have side effects. The FDA does not regulate supplements for safety and efficacy in the same way as prescription drugs.

Hormone Replacement Therapy (HRT): The Definitive Guide

Hormone Replacement Therapy (HRT) is the most effective medical treatment for many menopause symptoms. It works by replacing the hormones your ovaries no longer produce. However, a cloud of fear and confusion still surrounds HRT, largely due to the initial, widely publicized results of the Women’s Health Initiative (WHI) study in the early 2000s.

Since then, a deeper analysis of the WHI data and numerous subsequent studies have clarified our understanding. The 2022 Position Statement from The North American Menopause Society (NAMS) confirms that for most healthy women who start HRT within 10 years of menopause or before age 60, the benefits outweigh the risks [5]. The key is individualization. 

HRT comes in various forms, each with pros and cons:

• Pills: The most traditional form.
• Patches, Gels, Sprays (Transdermal): These deliver hormones through the skin, bypassing the liver, which may reduce the risk of blood clots compared to oral estrogen.
• Vaginal Rings, Creams, Tablets: These are used for treating local symptoms of GSM and have minimal systemic absorption.

Types of HRT: Estrogen-Only vs. Combined Therapy

This is a critical safety principle. According to ACOG guidelines, if you have a uterus, you must take a progestogen (like progesterone) along with estrogen[9]. Unopposed estrogen can stimulate the growth of the uterine lining (endometrium), increasing the risk of uterine cancer. Women who have had a hysterectomy can safely take estrogen-only therapy.

Bioidentical vs. Synthetic Hormones: What’s the Evidence?

You’ve likely heard the term “bioidentical hormones” (BHRT). This means the molecular structure is identical to the hormones your body produces. Some FDA-approved HRT products (like Estradiol patches) are bioidentical.

The controversy arises with custom-compounded BHRT. These are mixed at special pharmacies based on a doctor’s prescription. While proponents claim they are more “natural” and can be tailored to an individual, major medical bodies like The Endocrine Society and NAMS have expressed safety concerns. Custom-compounded hormones are not regulated by the FDA, meaning they haven’t been tested for safety, efficacy, or consistent dosing [13].

Is HRT Right for You? A Framework for Shared Decision-Making

The choice to use HRT is deeply personal and should be a collaborative conversation with your healthcare provider—a process known as shared decision-making. As Dr. Jessica L. Chan, an OB-GYN at Cedars-Sinai, emphasizes, it’s about weighing your personal symptoms, health history, and preferences against the most current evidence [14]. 

To prepare for that conversation, consider the following:

HRT is not recommended for women with a personal history of:

• Breast cancer
• Ovarian cancer
• Uterine (endometrial) cancer
• Blood clots (e.g., DVT or pulmonary embolism)
• Stroke or heart attack

Learn More: Your Path to an Empowered Menopause

Education is the single most powerful tool you have during this transition. When you understand your body, you can advocate for your needs, ask the right questions, and partner with your provider to create a plan that supports your long-term health and vitality.

If you want to go beyond this article and dive deeper, our 4-week online group program is designed for you. Led by experts Monique Class, MS, APRN-BC, and Dan Lukaczer, ND, this program provides a comprehensive, balanced, and evidence-based overview of menopause, hormones, and all your treatment options. You will learn to:

• Understand the science of hormonal changes and how they affect you.
• Weigh the personal benefits and risks of HRT.
• Explore effective lifestyle and alternative solutions for symptom relief.
• Protect your long-term heart, bone, and brain health.

Menopause is not an ending—it’s a new chapter. With the right understanding and support, you can navigate it with resilience and vitality. Ready to take the next step? Join our 4-week Menopause & HRT group program today and transform your menopause journey.

This article is for informational purposes only and does not constitute medical advice. The content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always consult with a qualified healthcare provider before making any decisions about your health or treatment.

References

1. Cleveland Clinic. (2022, May 4). Menopause: What It Is, Age, Stages, Signs & Side Effects. Retrieved from https://my.clevelandclinic.org/health/diseases/21841-menopause
2. Santoro, N., Roeca, C., Peters, B. A., & Neal-Perry, G. (2021). The Menopause Transition: Signs, Symptoms, and Management Options. The Journal of Clinical Endocrinology & Metabolism, 106(1), 1–15. Retrieved from https://pubmed.ncbi.nlm.nih.gov/33095879/
3. University of Rochester Medical Center. (N.D.). Estrogen’s Effects on the Female Body – Health Encyclopedia. Retrieved from https://www.urmc.rochester.edu/encyclopedia/content?ContentID=P00559&ContentTypeID=85
4. Women’s Health Concern. (2025, August). Menopause and Insomnia. Retrieved from https://www.womens-health-concern.org/wp-content/uploads/2025/08/17-NEW-WHC-FACTSHEET-Menopause-and-Insomnia-AUGUST2025-A.pdf
5. The North American Menopause Society. (2022). The 2022 Hormone Therapy Position Statement of The North American Menopause Society. Menopause, 29(7), 767-794. Retrieved from https://menopause.org/wp-content/uploads/professional/nams-2022-hormone-therapy-position-statement.pdf
6. Mayo Clinic News Network. (2023, August 21). Mayo Clinic Minute: Does menopause cause brain fog? Retrieved from https://newsnetwork.mayoclinic.org/discussion/mayo-clinic-minute-does-menopause-cause-brain-fog/
7. Baker, J. M., Al-Nakkash, L., & Herbst-Kralovetz, M. M. (2017). Estrogen-gut microbiome axis: Physiological and clinical implications. Maturitas, 103, 45–53.
8. National Institutes of Health. (2024, October). Managing Menopause. News in Health. Retrieved from https://newsinhealth.nih.gov/2024/10/managing-menopause
9. American College of Obstetricians and Gynecologists (ACOG). (2024, March). Hormone Therapy for Menopause. Retrieved from https://www.acog.org/womens-health/faqs/hormone-therapy-for-menopause
10. The Institute for Functional Medicine. (2018, April 25). Menopause Hormone Therapy: An IFM-Trained Practitioner’s Perspective. Retrieved from http://www.ifm.org/articles/menopause-hormone-therapy
11. NYU Langone Health. (2023, June 28). Manage Menopause with These Lifestyle Updates. Retrieved from https://nyulangone.org/news/manage-menopause-these-lifestyle-updates
12. National Center for Complementary and Integrative Health. (N.D.). Menopause Symptoms in Depth. Retrieved from https://www.nccih.nih.gov/health/menopause-symptoms-in-depth
13. The Endocrine Society. (2019, March 26). Bioidentical Hormones. Retrieved from https://www.endocrine.org/patient-engagement/endocrine-library/hormones-and-endocrine-function/bioidentical-hormones
14. Cedars-Sinai Staff. (2023, May 10). Hormone Replacement Therapy: Risks and Benefits. Cedars-Sinai Blog. Retrieved from https://www.cedars-sinai.org/blog/hormone-replacement-therapy-risks-benefits.html
15. Lee, J., et al. (2024). Sleep disturbance associated with the menopause transition and postmenopause: a comprehensive literature review. Menopause, 31(8), 659-672. Retrieved from https://journals.lww.com/menopausejournal/fulltext/2024/08000/sleep_disturbance_associated_with_the_menopause.11.aspx