Decoding Hormones: A Modern Look at Evidence-Based Research

Decoding Hormones: A Modern Look at Women’s Health, Cancer Risk, and Chronic Pain

Abstract

As a practitioner dedicated to integrative health, I frequently encounter patients searching for answers that conventional medicine hasn’t provided. This educational post aims to demystify the complex world of hormones—specifically estrogen, progesterone, and testosterone—and their profound impact on women’s health, from menopause and chronic pain to cancer risk and overall vitality. We will journey through the history of hormone research, dissecting the pivotal Women’s Health Initiative (WHI) study and its long-term consequences, and challenge long-held myths with compelling, evidence-based research from leading figures in the field. By exploring the molecular differences between bioidentical hormones and synthetic progestins, we can understand why hormone type and delivery systems are crucial for safety and efficacy. Crucially, this discussion will explore how an integrative chiropractic approach, focusing on the body’s structural and neurological integrity, provides a foundational pillar for achieving hormonal balance and overall wellness. My goal is to empower you with knowledge, helping you make informed decisions about your health journey by combining an evidence-based understanding of hormone biochemistry with a foundational chiropractic approach that honors the body’s innate intelligence.

Rethinking the Women’s Health Initiative: What If We Got It Wrong?

As a clinician, I often begin my consultations by asking, “Why are you here today?” The answer, more often than not, is a quiet frustration. Many of my patients feel that the conventional approaches they’ve tried simply aren’t working. They don’t feel better, they’re not content, and they’re searching for a different path. This is where our journey of discovery begins—by asking “why” and challenging long-held assumptions.

Let’s start with a significant moment in medical history: the Women’s Health Initiative (WHI) study. This study, published in 2002, dramatically changed the landscape of hormone therapy. But I often wonder, what if the study had been designed differently? What if, instead of using conjugated equine estrogens (like Premarin) and a synthetic progestin (medroxyprogesterone acetate, found in Prempro), the researchers had used bioidentical hormones?

Imagine if they had used a 17-beta estradiol patch, a form of estrogen identical to what the human body produces, delivered non-orally. This is a critical distinction.

• Oral vs. Non-Oral Delivery: When you take a hormone pill, it first passes through your digestive system and then to your liver—a process known as the first-pass metabolism. Your liver has to work extra hard to process this substance. In response, it produces various byproducts, including an increased amount of clotting factors. This is why oral contraceptives and oral estrogen therapies like Premarin are known to increase the risk of blood clots.
• The Cardioprotective Effect: We’ve long known that estrogen has cardioprotective benefits. However, when you take it in pill form, which slightly increases clotting, you effectively negate that heart-protective benefit. Most heart attacks and strokes are, at their core, related to clotting events. So, the WHI concluded that hormones didn’t help, but in reality, it may have been the wrong molecule delivered through the wrong system.

Had the WHI used bioidentical estradiol delivered via a patch or cream, which bypasses that first-pass liver metabolism, and paired it with natural, bioidentical progesterone, I firmly believe we would not be having this conversation today. The medical establishment would likely recommend that every woman begin estrogen and progesterone therapy at the onset of menopause and continue it for life. The science would have been clear.

The Aftermath of 2002: A Public Health Crisis

I was in private practice in 2002 when the results of the WHI study hit the front page of Time magazine with the headline, “The Truth About Hormones.” Positive news rarely makes the front page; fear sells. And this news scared millions. I had to hire an extra receptionist just to handle the flood of calls from panicked women wanting to stop their hormone therapy immediately.

In the years that followed, an estimated half a million women in the U.S. stopped their hormone therapy. What have we seen since then?

• Cognitive Decline: How are we doing with Alzheimer’s disease and cognitive decline in women? The rates are staggering. I see the heartbreaking effects in my community, where women who were once vibrant and sharp now struggle with basic memory and function.
• Heart Disease: Have we made any significant progress in reducing heart disease deaths over the last 25 years? The statistics show little improvement. We stopped using one of the most cardioprotective substances available to women.
• Bone Health: Hip fractures, often a devastating event for older adults, are intrinsically linked to the loss of bone density that accelerates after menopause when estrogen levels plummet.

From a musculoskeletal and neurological perspective, the loss of estrogen is catastrophic. As a chiropractor, I focus on the intricate connection between the nervous system, spine, and overall body function. Hormones, particularly estrogen, are powerful neurological modulators. They influence pain perception, inflammation, and tissue repair. When these hormone levels decline, patients often experience a surge in chronic pain, joint stiffness, and a decreased ability to heal from injuries. This is why a purely mechanical approach to back pain or joint issues in menopausal women often falls short. We must consider the underlying biochemical environment.

Vindicating Estrogen: The Long-Term Data

The story doesn’t end in 2002. Researchers continued to follow the same group of women from the WHI study. What they found, years later, completely upended the initial conclusions.

A follow-up report published in 2013, after a median of 18 years, found that estrogen-alone therapy (the Premarin-only arm) was not associated with an increased risk of all-cause, cardiovascular, or cancer mortality. It was a quiet retraction, a “never mind” that didn’t make front-page news. It was an apology to the grandmothers who suffered from preventable fractures and the grandfathers who faded away with Alzheimer’s.

It gets even more compelling. In 2020, another analysis of the same long-term data was published in JAMA. This analysis found that women who took estrogen-only for approximately eight years had a lower incidence of breast cancer and were less likely to die from it over the course of their lives.

Let that sink in. The only medicine in the history of medical science that has been shown in a prospective, randomized, placebo-controlled trial to reduce a woman’s chance of both getting and dying from breast cancer is estrogen. And this was demonstrated with Premarin, a formulation derived from horse urine that is far from ideal. Imagine the potential benefits of using bioidentical estradiol. This evidence, which came out years ago, should have revolutionized how we approach women’s health. We should be ensuring our patients are well-informed to help prevent breast cancer, not withholding it out of fear.

The Progesterone vs. Progestin Debate: Getting the Molecules Right

It is absolutely critical to understand the difference between progesterone and progestins. They are not the same. When I see a new study claiming “hormone replacement therapy” caused a negative outcome, the first thing I do is check the abstract to see which molecules were used. If they used a synthetic progestin, I know the results are likely skewed.

• Progesterone (P4): This is the natural hormone our bodies produce. It has a specific molecular structure that fits perfectly into our progesterone receptors. It is neuroprotective and has calming effects, which is why it’s so beneficial for sleep.
• Progestins: These are synthetically created molecules designed to mimic some of progesterone’s effects. There are many different families, such as medroxyprogesterone acetate and norethindrone acetate. Their structures differ from those of natural progesterone, and they can bind to other hormone receptors (such as androgen or glucocorticoid receptors), leading to a range of side effects. The WHI study used a synthetic progestin, not bioidentical progesterone, and this was the source of the trend towards increased breast cancer risk.

The constant confusion in the media and even in some medical literature between these two distinct classes of substances is a major source of misinformation. When I refer to progesterone, I am exclusively talking about bioidentical, natural progesterone.

The Chiropractic Connection: Structural Integrity and Hormonal Flow

From an integrative chiropractic standpoint, we see the body as a self-regulating, self-healing organism. Our primary goal is to remove interference to the nervous system, which controls and coordinates every other system in the body, including the endocrine (hormone) system. Misalignments in the spine, known as vertebral subluxations, can create nerve interference that disrupts the delicate communication pathways between the brain and the glands that produce hormones, like the ovaries.

We utilize specific chiropractic adjustments to restore proper spinal alignment and motion. This isn’t just about relieving back pain; it’s about optimizing nerve function. By ensuring the nerves that supply the pelvic organs are free from interference, we help create an optimal physiological environment for the endocrine system to function. Physical therapy modalities are also integrated to strengthen core muscles, improve posture, and support the structural integrity that is foundational to neurological health. When a woman is going through menopause, her body is already under significant stress. Adding the stress of nerve interference from a misaligned spine can exacerbate symptoms like hot flashes, mood swings, and sleep disturbances. By addressing the structural component, we support the body’s innate ability to adapt and find balance.

Testosterone: The Underappreciated Hormone for Women’s Health

One of the most persistent and damaging myths in medicine is that testosterone is a “male hormone.” This is fundamentally incorrect. In fact, over her lifetime, a woman produces significantly more testosterone than she does estrogen. The highest production occurs in the first 30-35 years of life, which is why its decline is so acutely felt as women enter perimenopause and menopause. Further proof lies in our genetics: the androgen receptor is located on the X chromosome. You can’t obtain more evidence than that to show it is essential for both sexes.

A fascinating study revealed that removing the ovaries in menopausal women (oophorectomy) led to a significant increase in the risk of all-cause mortality, heart disease, and strokes. However, women who retained their ovaries, even post-menopause, had substantially lower risks. The question is, what is that tiny menopausal ovary producing that offers such protection? The answer is testosterone. That small amount was the critical factor, influencing everything from cardiovascular function to longevity.

Testosterone: A Protective Force Against Breast Cancer

This brings us to one of the most exciting and underappreciated areas of research: the protective role of testosterone in women, especially concerning breast cancer. The leading voice in this field is Dr. Rebecca Glaser, a breast surgeon whose work has demonstrated time and again that testosterone is not the enemy; it is a powerful ally.

Here’s what the evidence shows:

• Testosterone is Anti-Proliferative: In study after study, testosterone has been shown to have anti-inflammatory and anti-cancer effects on breast tissue.
• Improving Quality of Life During Cancer Treatment: Many women on aromatase inhibitors suffer debilitating side effects like joint pain and fatigue. Dr. Glaser’s research showed that giving these women testosterone dramatically improved their quality of life, helping them adhere to their life-saving treatment.
• Direct Anti-Tumor Effects: In a remarkable study, Dr. Glaser’s team implanted testosterone pellets directly into the tissue surrounding breast tumors before surgery. They observed a staggering 46% average reduction in tumor volume, providing powerful evidence of testosterone’s anti-cancer properties.

A landmark prospective study she conducted followed more than 1,000 women for 5 years. The study predicted 80 invasive breast cancers would occur in this group based on standard risk models. In the women receiving testosterone therapy, only 11 occurred. This represents a massive reduction in breast cancer incidence, demonstrating a powerful protective effect.

Hormones and Chronic Pain: The Missing Piece in Pain Management

As a specialist in musculoskeletal and spinal health, I work extensively with patients suffering from chronic pain. The literature is rich in data linking testosterone, thyroid hormones, and progesterone to pain perception, yet this knowledge often remains siloed.

• The Opioid-Hormone Vicious Cycle: Chronic pain patients are often on opioids. Increased pain leads to higher opioid doses, which in turn suppress critical hormones like testosterone. Low testosterone then exacerbates pain perception, creating a feedback loop.
• A Call for a New Standard of Care: Leading voices in pain management now argue that functional testosterone testing and replacement should be a mandatory component of care for chronic pain patients.

I vividly recall a patient with a fibromyalgia diagnosis. She had suffered for years with widespread pain and fatigue. After a comprehensive evaluation that included her hormonal status, we began a protocol to optimize her testosterone levels alongside targeted chiropractic care and physical therapy. Within months, her change was remarkable. She told me, “You know what, my fibromyalgia is gone.” Her experience, and many others since, has solidified my conviction.

The mechanism is fascinating. The conversion of testosterone to estrogen is crucial for joint health. Estrogen helps maintain joint integrity. The number one symptom of menopause is not hot flashes, but joint pain, bone pain, and muscle pain. It’s the first sign of what I call “Energy Deficiency Syndrome,” a state in which the body’s hormonal engine is running on empty.

The Role of Integrative Chiropractic in Pain and Hormonal Balance

The connection between my work at a chiropractic clinic and hormonal health is direct and synergistic.

1. Addressing the Root of Musculoskeletal Pain: When a patient presents with chronic joint pain or fibromyalgia, simply adjusting the spine or prescribing exercises may only provide temporary relief if the underlying issue is hormonal. By integrating a functional medicine assessment, we can address the biochemical root of their pain. Optimizing testosterone not only reduces inflammation but also enhances joint health from within.
2. Enhancing Physical Therapy Outcomes: Patients with low testosterone suffer from fatigue, low motivation, and an inability to build muscle (sarcopenia). This makes it incredibly difficult to benefit from physical therapy. Restoring their hormonal balance gives them the energy, strength, and drive to perform their prescribed exercises, leading to faster recovery. Chiropractic adjustments become more effective as the supporting musculature strengthens, allowing adjustments to be held longer and improving overall biomechanics.
3. A Whole-Body Approach: My philosophy, as both a Doctor of Chiropractic (DC) and an Advanced Practice Registered Nurse Practitioner (APRN), is to view the body as an interconnected system. The nervous system, which I directly influence through chiropractic care, is intricately linked with the endocrine (hormone) system. Stress on the spine can impact hormonal regulation, and hormonal imbalances can increase pain sensitivity. By addressing both simultaneously—optimizing spinal function through adjustments and cellular function through hormonal balance—we create a powerful healing synergy that leads to true, lasting health.

By combining an evidence-based understanding of hormone biochemistry with a foundational chiropractic approach that honors the body’s structural and neurological integrity, we can create a truly holistic and effective path to wellness for women at every stage of life.

References

• Chlebowski, R. T., Anderson, G. L., Aragaki, A. K., Manson, J. E., Stefanick, M. L., Pan, K., … & Prentice, R. L. (2020). Association of menopausal hormone therapy with breast cancer incidence and mortality during long-term follow-up of the Women’s Health Initiative randomized clinical trials. JAMA, 324(4), 369–380.
• Glaser, R., & Dimitrakakis, C. (2013). Testosterone therapy in women: myths and misconceptions. Maturitas, 74(3), 230–234.
• Glaser, R. L., York, A. E., & Dimitrakakis, C. (2019). Short-term preoperative administration of testosterone in women with breast cancer reduces tumor cell proliferation. Breast Cancer Research, 21(1), 37.
• Manson, J. E., Chlebowski, R. T., Stefanick, M. L., Aragaki, A. K., Rossouw, J. E., Prentice, R. L., … & Women’s Health Initiative Investigators. (2013). Menopausal hormone therapy and health outcomes during the intervention and extended poststopping phases of the Women’s Health Initiative randomized trials. JAMA, 310(13), 1353–1368.
• Rizk, P. J., Kedia, S., Kohn, T. P., & Pastuszak, A. W. (2018). Testosterone therapy improves pain and reduces opioid use in opioid-induced androgen deficiency. Current Urology Reports, 19(6), 46.
• Rossouw, J. E., Anderson, G. L., Prentice, R. L., LaCroix, A. Z., Kooperberg, C., Stefanick, M. L., … & Writing Group for the Women’s Health Initiative Investigators. (2002). Risks and benefits of estrogen plus progestin in healthy postmenopausal women: principal results From the Women’s Health Initiative randomized controlled trial. JAMA, 288(3), 321–333.