Your body has preferred levels of hormones that allow it to function at its best. It is normal for hormone levels to change as you age, but sometimes the change in the female hormone cycle can cause symptoms that affect your quality of life.
There are multiple types and delivery methods for hormone therapy. The Society of Obstetricians and Gynaecologists of Canada (SOGC) has published a document outlining hormone therapy products approved and available for use in Canada.[1] A summary table can be found here
The first hormone therapy used specifically to treat symptoms of the menopausal transition happened in 1942. By the 1960s, estrogen was considered a ‘vital substance’ for all women and was prescribed broadly. This all changed in 2002, when the first set of results from the Women’s Health Initiative study were published. These results, which showed that post-menopausal women taking combination (estrogen and progestin) hormone therapy for menopause symptoms had an increased risk for breast cancer, heart disease, stroke, blood clots, and urinary incontinence, caused a decline of over 80% in the prescription of hormone therapy and created fear and uncertainty that exist into the present day. [7]
HT has been shown to assist with hot flashes, night sweats, bone loss and fracture, vaginal dryness and urinary incontinence. The North American Menopause Society (NAMS) position statement [3] and other research [2] [4] [5] [6] provide the following information specific to different symptoms of the menopausal transition:
Hormone therapy is an excellent therapy for the treatment many women’s menopausal transition symptoms. However, hormone therapy has effects in the body beyond just bothersome symptoms.
Bioidentical hormones are synthetic compounds that are manufactured to mimic natural hormones. They are intended to interact with hormone receptors in the body in the same way as natural, or conventional, hormones. [1] [1a]
Your body has preferred levels of hormones that allow it to function at its best. It is normal for hormone levels to change as you age, but sometimes the change in the female hormone cycle can cause symptoms that affect your quality of life. When you are experiencing symptoms throughout your menopause transition you may be referred to an endocrinologist – if not, you may request to see one by asking your healthcare provider. If you do not already have a healthcare practitioner who is familiar with identifying and treating symptoms of menopause, the North American Menopause Society provides a list of menopause practitioners here
Hormone therapy is the most effective treatment for vasomotor symptoms (VMS) such as hot flashes and night sweats, and has been shown to prevent bone loss and fracture. The risks of hormone therapy differ for women, and depend on type, dose, duration of use, route of administration, timing of initiation, and whether a progestogen is needed. Treatment should be individualized using the best available evidence to maximize benefits and minimize risks. Periodic re-evaluation is strongly recommended.
Your healthcare provider is the best source to advise you on whether or not this therapy will improve your quality of life. To get HT, you will need a prescription from a medical doctor (GP, OB/GYN, or an endocrinologist), nurse practitioner, or, in some places, a naturopathic doctor (ND).
It is highly recommended that women considering HT have an open and comprehensive discussion with their health care provider about their specific symptoms and preferred outcomes. Note the following:
Women with early or premature natural menopause (when periods stop before the age of 40) and Primary Ovarian Insufficiency (POI – a condition where the ovaries stop working properly for no obvious medical reason) experience an extended period of time without ovarian hormone activity leading to a potential estrogen deficiency in all tissues compared with women experiencing normal menopause.
Health risks of early natural menopause and primary ovarian insufficiency (POI) may include persistent vasomotor symptoms (VMS – hot flashes and night sweats), bone loss, genitourinary syndrome, mood changes, and increased risk of heart disease, dementia, stroke, Parkinsons disease, eye disorders, and overall mortality.[3a] As well, women with POI have a higher risk of death from ischemic heart disease (heart disease caused by narrowed arteries) as well as from all causes, compared with women who have a normal age of natural menopause, which may be reflective of premature aging. They also have a higher risk of digestive tract cancer but a decreased risk of mortality from breast, uterine, and endometrial cancer. [3a]
When both ovaries are surgically removed (bilateral oophorectomy), the loss of ovarian hormones – estrogen, progesterone, and testosterone – is abrupt. This can trigger vasomotor symptoms as well as a variety of estrogen deficiency-related symptoms and diseases that can have a major effect on quality of life (QOL). You can assess your own Quality of Life assessments here .
Potential adverse events (AEs) can occur in the cardiovascular system, and on bone health, mood, sexual health, and cognition. All of these have been shown (in clinical observational studies ) to be improved by estrogen therapy. [3a]
There are multiple types and delivery methods for hormone therapy. The Society of Obstetricians and Gynecologists’ of Canada (SOGC) has published a document outlining hormone therapy products approved and available for use in Canada.[1] A summary table is shown below.
Hormone therapy is prescribed as either systemic HT (throughout the body) or low-dose vaginal HT. Systemic estrogen comes in many forms (e.g. cream, tablets, skin patches etc.) and typically contains a higher dose of estrogen that is absorbed throughout the body. Low-dose vaginal HT comes in multiple forms (cream, tablet, or insertable vaginal ring) and minimizes the amount of estrogen absorbed by the body. Low-dose vaginal HT is only used to treat the vaginal and urinary symptoms of menopause.
There are a variety of hormones used in HT including estrogen alone (estrogen therapy or ET) using multiple types of estrogens, as shown in the table, or a mix of estrogen and progesterone (estrogen and progestogen therapy or EPT) in multiple combinations, also shown in the table. In addition to estrogen or estrogen-progestogen combinations, other HT treatments include the use of selective estrogen receptor modulators (SERMs) to make tissue-selective estrogen complexes (TSECs). [3a]
SERMs act by blocking some estrogen receptors and activating others. For example, raloxifene (a type of SERM) blocks estrogen receptors on breast tissue to decrease the risk for breast cancer, while activating estrogen receptors in bone to stimulate bone retention. In this way, SERMs can offer targeted, multi-benefit care for specific estrogen-sensitive tissues.
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Selective serotonin reuptake inhibitors (SSRIs) or serotonin and norepinephrine reuptake inhibitors (SNRIs) can also be prescribed, although they are technically non-hormone therapies. SSRIs and SNRIs are antidepressant medications, but they can be used to treat hot flashes. They work by rebalancing or intercepting epinephrine and serotonin, which are chemicals in the brain that can trigger hot flashes. SSRIs increase serotonin levels in the brain, while SNRIs increase both serotonin and norepinephrine levels. [2][5]
One large study that reviewed and re-analyzed multiple studies’ data found that in half of the trials analyzing clonidine, a drug often used to treat high blood pressure, significantly reduced VMS frequency compared to placebo. However, the remaining trials show no significant difference. Clonidine is associated with a number of adverse effects, including dry mouth, constipation, and drowsiness. Given this, clonidine is not considered the ideal choice for VMS treatment but it can be an option for some women. [5a]
Gabapentin, which is an anticonvulsant used to treat and prevent seizures, can also be used to treat vasomotor symptoms. Multiple randomized controlled trials (RCTs) have shown that gabapentin can successfully reduce the frequency of vasomotor symptoms compared to a placebo. More research data is needed to further study the usefulness and safety of gabapentin to treat VMS.
The first hormone therapy used specifically to treat symptoms of the menopausal transition happened in 1942. By the 1960s, estrogen was considered a ‘vital substance’ for all women and was prescribed broadly. This all changed in 2002, when the first set of results from the Women’s Health Initiative study were published. These results, which showed that post-menopausal women taking combination (estrogen and progestin) hormone therapy for menopause symptoms had an increased risk for breast cancer, heart disease, stroke, blood clots, and urinary incontinence, caused a decline of over 80% in the prescription of hormone therapy and created fear and uncertainty that exist into the present day. [7]
The reduction in hormone therapy prescriptions was a direct result of the US Food and Drug Administration’s (FDA) warning labels that were issued for ‘all women and pertaining to all estrogens and progestogens, and to all doses and routes of administration’. [2]
It is unfortunate that the results were interpreted by the FDA in this manner, because, while they were accurate for the group under study (women aged 50-79), this is not the age group that is typically considered to start hormone therapy. There were limited study participants with bothersome menopausal transition symptoms (hot flashes and night sweats) where were younger than 60 years old or who were fewer than 10 years from the onset of menopause; this is the group for whom hormone therapy is usually indicated. The study design assessed ‘Does hormone therapy help prevent coronary artery disease?’, and used one group to investigate one type of estrogen/progesterone treatment and another group to investigate an estrogen-only treatment. While the study results themselves were accurate, the results were applied far too broadly, well beyond the scope of the study. [2]
Work to accurately communicate results of hormone therapy studies continues to the present day. Worldwide, there has been a shift to develop updated recommendations. For example, the 2017 hormone therapy position statement of The North American Menopause Society (NAMS) provides much more accurate recommendations. [3] An advisory panel of clinicians and researchers with expertise in women’s health and menopause assessed the WHI paper as well as all subsequently published research to develop the updated position statement, which reads:
The full position statement can be found at menopause.org [3]
Despite the warning labels included in all prescriptions, the FDA currently approves hormone therapy for:
Safety of HT
Safety of using HT can be assessed using both relative and absolute risk. Relative risk (also called the risk ratio) compares the odds of an event happening to two groups by comparing them against each other. For example, if you look at two groups of women – one with a mother, sister or daughter who has had breast cancer and the other without any close female relatives with breast cancer – the relative risk of breast cancer is higher in the group with close female relatives that have breast cancer. Relative risk doesn’t give information on a woman’s actual odds, or absolute risk, of getting breast cancer. The newly released updated 2022 hormone therapy position statement of The North American Menopause Society (NAMS) indicates the following about HT safety:
Extended Use of HT and Risks of Discontinuing HT
Decisions about how long to stay on HT are difficult because the long-term follow-up data is complicated to interpret, especially with respect to breast cancer. However, NAMS states with confidence that:
Hormone Therapy and Menopausal Transition Symptoms (HT) has been shown to assist with hot flashes, night sweats, bone loss and fracture, vaginal dryness and urinary incontinence. The North American Menopause Society (NAMS) position statement [3] and other research [2] [4] [5] [6] provide the following information specific to different symptoms of the menopausal transition:
According to the International Menopause Society, HT remains the most effective therapy for hot flashes and night sweats and it is well documented that the frequency and intensity of hot flashes and night sweats can be reduced by estrogen HT. [3][4]
During the menopause transition, women with vasomotor symptoms are more likely to report reduced sleep. Hormone therapy has been shown to improve sleep in women with bothersome night time VMS by reducing night time awakenings. [2][3a][6]
Vaginal symptoms of GSM may include genital dryness, burning, and irritation and sexual symptoms of diminished lubrication and painful intercourse. [3]
Urinary tract symptoms of GSM include pelvic floor disorders (prolapse), urinary symptoms of urgency, incontinence, painful urination, and recurrent urinary tract infections (UTIs).
Systemic HT and low-dose vaginal estrogen therapy provide effective treatment of sexual problems by increasing lubrication, blood flow, and sensation in vaginal tissues. Studies have not found any significant effect of low-dose vaginal estrogen therapy on sexual interest, arousal, and orgasmic response outside of its role in treating menopause symptoms – so if your sexual issues are not a result of menopausal transition symptoms, then HT or low-dose vaginal estrogen therapy will not help. [3a]
Hormone therapy is an excellent therapy for the treatment many women’s menopausal transition symptoms. However, hormone therapy has effects in the body beyond just bothersome symptoms. The impacts of HT on various body systems and health conditions are detailed below.
One review study showed that hormone therapy provides a significant benefit for menopause-specific quality of life in midlife women, mainly through relief of symptoms. Treatment can also cause an increase in the overall quality of life. [6a]
Women who experience severe symptoms tend to experience statistically significant improvement in both health-related and menopause-specific quality of life measures. Similar levels of improvement are not shown to be statistically significant for women who do not experience severe symptoms as measured during clinical trials.[6a]
Another review study also concluded that HT improves quality of life of symptomatic menopausal women. This study also found reliable evidence on quality of life improvements beyond just a reduction in vasomotor symptoms.[6b]
Visit our resources page here to find the tools to assess your Quality of Life.
Standard-dose ET and HT prevent bone loss in postmenopausal women by inhibiting bone resorption, which is the process by which osteoclasts (a type of bone cell) break down the tissues making up bones and release those minerals causing a transfer of calcium from bone tissue to the blood. The estrogen in HT is highly effective at preventing menopause-related bone loss. [2][3a]
Hormone therapy can be used to manage symptoms that affect the skin, hair, sight, hearing and balance. [3a]
Hormone therapy containing estrogen can be beneficial for joint pain. Direct binding of estrogen to estrogen receptors in joint tissues protects the biomechanical structure and function and helps maintain overall joint health. [3a]
Sarcopenia, the loss of muscle as you age, results in frailty and is associated with adverse events such as falls, hospitalization, disability, and death. While skeletal muscle does contain estrogen receptors, little is known about the interactions between estrogen and muscle.
Different types of estrogen may have different effects on the breast so the results of studies are limited and they should not be generalized. The type and severity of breast cancer risk from HT varies depending on the type of HT, the dosage, the duration of the treatment, the time the treatment is initiated and individual patient characteristics.
The benefits of hormone therapy outweigh the risks for healthy women with bothersome menopause symptoms who are aged younger than 60 years or within 10 years of menopause onset. However, the risk of HT does increase the older women are and the longer HT is used. As such, women are advised to use the appropriate dose for the time needed to manage their symptoms. Many women experience bothersome symptoms for many years, so long-duration hormone therapy use may be needed. This should be assessed on an individual basis, so creating arbitrary age-based guidance on when to stop using HT is not clinically appropriate.
Bioidentical hormones are synthetic compounds that are manufactured to mimic natural hormones. They are intended to interact with hormone receptors in the body in the same way as natural, or conventional, hormones. [1] [1a]
In addition to the risks associated with conventional, fully-regulated hormone therapies, there are additional risks with bioidentical hormones. These risks are due to the absence of regulatory oversight. Consider that government-approved (FDA-approved) bioidentical hormones, including estradiol and estrone, are regulated, are monitored for purity and effectiveness, come with extensive product information, and include warnings for any potential adverse effects. Any FDA-approved products also undergo extensive clinical testing and reporting.
Compounded bioidentical hormones are made at a compounding pharmacy using a prescription from a health-care provider. Compounding a product can be necessary if there are allergies or sensitivities to ingredients found in medicines made by a pharmaceutical company. Bioidentical hormones may combine multiple hormones such as estradiol, estrone, estriol, dehydroepiandrosterone [DHEA], testosterone, and/or progesterone, and may use untested, unapproved combinations or formulations. As well, they can be offered in untested applications such as subdermal implants.
Bioidentical hormones are often prescribed based on the use of salivary testing, however this type of testing for HT is considered to be unreliable. The issues are due to how hormones travel throughout the body (call pharmacokinetics) and differences in how they are absorbed, variations in hormone levels throughout the day and individual variations in hormone levels that are seen in saliva (compared to urine or serum levels for example).
The North American Menopause Society (NAMS) 2022 updated hormone therapy position statement, which is endorsed by the Society of Obstetricians and Gynaecologists of Canada (SOGC), reads:
The endocrine system is made up of a series of glands that produce and secrete hormones directly into your bloodstream for use throughout the body. The hormones are used for a wide range of functions (beyond reproduction in women) and act as chemical messengers throughout the body. The endocrine system works by sending signals from your brain to different glands that secrete specific hormones for specific purposes.
This table shows the most important hormones during the menopause transition, what the hormones are, where in the body they are produced and what they do in the body. [10] [11] [12]
In July 2022, the North American Menopause Society (NAMS) released an upate to the 2017 Hormone Therapy Position Statement. NAMS used an Advisory Panel of experts in the fields of women’s health and menopause (both clinicians and researchers) to review the 2017 Position Statement, evaluate new literature, assess the evidence, and reach consensus on updated recommendations. Highlights from this update include:
Women with symptoms currently undiagnosed.
Women who went more than a year before being formally diagnosed.
Women who don’t know the difference between perimenopause and menopause prior to experiencing symptoms.
MYTH
Osteoporosis is a biological process of bone density loss and increased bone breakage. It is part of the natural aging process for both men and women. Strong bones depend on many factors including your genetics, how you grew during puberty, exercise levels, your diet, smoking, and alcohol consumption. Your bones are at peak strength and density around age 30.
HT including estrogen is very effective at supporting bone density and strength, especially when combined with a healthy lifestyle. As well, strength training such as weight lifting or even standing instead of sitting, plus a good diet including calcium and vitamin D3 can help maintain bone strength.
Mid-life sees many hormone changes. Those plus decreased physical activity can contribute to osteoporosis, which can affect you in your early 50’s, causing low-impact bone breaks.
MYTH
HT can benefit women with mild-to-moderate common symptoms such as
Please talk to your healthcare provider about any of your health concerns. Many are manageable and some can be moderated with simple behavioral changes.
MYTH
Risk for colon-rectal cancer increases with age. Menopause transition and HT/HRT themselves do not increase your risk for colorectal cancer. It is unclear right now whether HT protects you against colorectal cancer. If you do not already, please start medical screening for CRC starting at age 50 as part of your overall self-care regimen.
MYTH
Data about the influence of HT on stroke are mixed. HT may increase the incidence of stroke, but this is nullified in women who exercise moderately. A stroke (ischemic stroke) is a clogged blood vessel blocking blood flow to the brain. Without blood flow and oxygen, brain tissue will die. Strokes can lead to serious losses of brain function. Strokes are the third leading cause of death in Canadian women and the risk for stroke increases with age.
The key to reducing the risk of stroke is a healthy lifestyle. The risk factors are:
Please discuss your personal risks for stroke when discussing HT with your healthcare provider.
MYTH
HT alone does not increase the risk of a heart attack. Heart attacks are the number two killer of women in Canada. Healthy perimenopausal women benefit from a protective effect from HT and in fact have a lowered risk of heart attack.
Post- menopause, as a woman grows older, the risks of heart disease increase. Risks for HT are age and life-style related.
The seven major risk factors for heart disease can all be modified, so a woman can adjust her lifestyle and reduce these risks. These risks are:
If you have any of these risk factors in your life, tell your healthcare provider when you are discussing hormone therapy.
MYTH
Hormone therapy for treatment of menopausal symptoms was thought to increase the risk of a woman’s chance of breast cancer, stroke and blood clots. This evidence has been re-evaluated, and HT using estrogen has been shown to be safe and effective. [2] [3] What is now known is:
Hormone replacement therapy (HRT) is generally safe if you work together with a qualified healthcare provider. HRT is known to help many women with hot flashes, vaginal dryness, and keeping bones strong among other symptoms.
1. http://www.menopause.org
2. Melmed et al.Williams Textbook of Endocrinology 14 th edition.
3. Santoro_2016_Perimenopause: From Research to Practice
4. Allshouse et al._2018_Menstrual cycle hormone changes associated with reproductive aging and how they may relate to symptoms
5. Dasai and Brinton_2019 Autoimmune disease in women: endocrine transition and disease across lifespan
Hot flashes can be addressed in many ways but it’s best to collaborate with your care provider to find a therapy that works for you. Hormone therapy (HT) can be effective at reducing the frequency and intensity of hot flashes for many women. Antidepressants, meditation and relaxation techniques work also well as they lower stress hormones. Ensuring you are eating a well-balanced nutritious diet can also help.
Bio- identical hormones are reproductive steroid hormones, such as estrogen or progesterone, used in hormone therapy (HT). The term “bio-identical” means the hormones in the HT product are chemically identical to those your body produces.
Bio-identical hormones can be easily recognized and used by our bodies so the effects are more consistent with our natural biochemistry. As well there is a smaller risk of unpredictable side effects than with synthetic or non-bio-identical hormones.
There are FDA approved bio-identical hormones that are safe and effective, but there is no evidence to date that bio-identical hormones are more effective or safer than synthetic hormones. There are also FDA approved natural hormones that are derived from plants.
There are options to help reduce or manage some symptoms. The primary tool is called Hormone Therapy (HT), also called hormone replacement therapy (HRT), menopausal hormone therapy (MHT), or hormone management therapy (HMT). HT is helpful for decreasing hot flashes, improving the health of your vagina and urinary systems, and supporting your muscle and bone health and strength.
Unfortunately, other symptoms may not respond as well to HT. Physiotherapy can help with physical pain and psychological counseling and therapy can help with emotional troubles. Lifestyle changes to promote quality sleep, good nutrition, and exercise are important and known to decrease menopausal transition symptoms.
The frequency and intensity of hot flashes and night sweats.
Bone mineral density and fracture incidence and risk.
Vaginal dryness.
Quality of sleep.
Body aches that are not related to bone loss.
Urinary Control.
[1] SOGC 2018. Hormone Therapy Products available in Canada for the Treatment of Menopausal Symptoms, Physician Desk Reference – 3rd edition
[1a] Harvard Health Publications, Harvard Medical School. https://www.health.harvard.edu/press_releases/myths-and-truths-about-bioidentical-hormones
[2] Minkin MJ. Menopause: Hormones, Lifestyle, and Optimizing Aging. Obstet Gynecol Clin North Am. 2019 Sep;46(3):501-514. doi: 10.1016/j.ogc.2019.04.008. Epub 2019 Jun 21. PMID: 31378291.
[3] The NAMS 2017 Hormone Therapy Position Statement Advisory Panel. The 2017 hormone therapy position statement of the North American Menopause Society
[4] R. J. Baber, N. Pa nay & A. Fenton the IMS Writing Group (2016): 2016 IMS Recommendations on women’s midlife health and menopause hormone therapy, Climacteric, DOI: 10.3109/13697137.2015.1129166 3]
[5] Bulun_Physiology and pathology of the female reproductive axis. William’s Textbook of Endocrinology, 14 th edition. Elsevier, 2019.
[5a] Umland EM, Falconieri L. Treatment options for vasomotor symptoms in menopause: focus on desvenlafaxine. Int J Womens Health. 2012;4:305-319. doi:10.2147/IJWH.S24614
[6] Attarian H, Hachul H, Guttuso T, Phillips B. Treatment of chronic insomnia disorder in menopause: evaluation of literature. Menopause 2015;22:674-684
[6a] Utian, W. H., & Woods, N. F. (2013). Impact of hormone therapy on quality of life after menopause. Menopause (New York, N.Y.), 20(10), 1098–1105. https://doi.org/10.1097/GME.0b013e318298debe
[6b] Pines, A., Sturdee, D. W., & MacLennan, A. H. (2012). Quality of life and the role of menopausal hormone therapy. Climacteric : the journal of the International Menopause Society, 15(3), 213–216. https://doi.org/10.3109/13697137.2012.655923
[7] Writing Group for the Women’s Health Initiative Investigators. Risks and Benefits of Estrogen Plus Progestin in Healthy Postmenopausal Women: Principal Results From the Women’s Health Initiative Randomized Controlled Trial. JAMA. 2002;288(3):321–333. doi:10.1001/jama.288.3.321
[8] Craig, M. C., Maki, P. M., & Murphy, D. G. (2005). The Women’s Health Initiative Memory Study: findings and implications for treatment. The Lancet. Neurology, 4(3), 190–194. https://doi.org/10.1016/S1474-4422(05)01016-1
[8a] Vinogradova Y, Dening T, Hippisley-Cox J, Taylor L, Moore M, Coupland C et al. Use of menopausal hormone therapy and risk of dementia: nested case-control studies using QResearch and CPRD databases BMJ 2021; 374 :n2182 doi:10.1136/bmj.n2182
[9] O’Brien KM, Fei C, Sandler DP, Nichols HB, DeRoo LA, Weinberg CR. Hormone therapy and young-onset breast cancer. Am J Epidemiol 2015;181:799-807
[10] You and Your Hormones (The Society for Endocrinology) https://www.yourhormones.info/hormones/follicle-stimulating-hormone/
[11] https://www.endocrineweb.com/endocrinology/introduction-endocrinology-endocrine-surgery
[12] Melmed, S., Polonsky, K. S., Larsen, P. R. & Kronenberg, H. M. (2016) Williams Textbook of Endocrinology. Philadelphia, Pa: Elsevier.