Removing both ovaries triggers an abrupt and complete loss of ovarian hormones, primarily estrogen, progesterone, and a significant share of testosterone. Unlike natural menopause, which unfolds over years as hormone levels gradually taper, bilateral oophorectomy creates immediate surgical menopause regardless of a woman’s age. That distinction matters because the speed and completeness of the hormonal drop shape almost every downstream effect, from hot flashes and mood changes to long-term risks involving the heart, bones, and brain.
The Hormonal Cliff
The ovaries are not just reproductive organs. They are endocrine glands that produce estrogen, progesterone, and roughly half of a premenopausal woman’s circulating testosterone. When both are removed, all three hormone levels plunge within hours rather than declining over the five to ten years of a typical menopausal transition. Estradiol, testosterone, and progesterone are all measurably lower after surgical menopause than after natural menopause, and the decline is abrupt rather than gradual.1The American Journal of Medicine. Premature Menopause This acute hormonal withdrawal is what drives many of the more intense symptoms women report in the weeks and months after surgery.2PubMed Central. Loss of Ovarian Hormones and Accelerated Somatic and Mental Aging
That matters practically because the body has estrogen receptors in the brain, heart, bones, skin, vaginal lining, and gut wall. When estrogen supply is cut off suddenly, all of those tissues register the loss at once. Women who go through natural menopause have time for other physiological adjustments to partially compensate. Women who undergo bilateral oophorectomy, especially before the average age of natural menopause (around 51), do not get that buffer period.
Cardiovascular Risks
Estrogen helps keep blood vessels flexible and supports healthy cholesterol balance. Removing that protection early appears to raise the risk of coronary heart disease, though the degree depends heavily on the woman’s age at surgery. A review of the evidence found that bilateral oophorectomy around the time a woman would have reached menopause naturally may have a small or negligible effect on cardiovascular risk, but oophorectomy before menopause significantly increases it.3PubMed. Surgical menopause and cardiovascular risks The risk is primarily coronary heart disease rather than stroke.
A large cohort study put numbers to this: women who had both ovaries removed before age 45 had roughly 44 percent higher cardiovascular mortality than women who kept their ovaries. Among those who did not take estrogen therapy through at least age 45, the risk nearly doubled.4PubMed Central. Increased cardiovascular mortality following early bilateral oophorectomy That same study found that the increased mortality disappeared in women who did use estrogen, which is one of the strongest arguments for hormone therapy in younger oophorectomy patients.
Bone Loss and Fracture Risk
Estrogen slows bone breakdown. Once it vanishes, osteoclasts (the cells that dissolve old bone) outpace the cells that build new bone, and density drops. In one study of women who had oophorectomy for cancer-risk reduction, lumbar spine bone mineral density fell by about 8.5 percent in just 18 months, with hip density declining roughly 5 to 6 percent over the same period.5PubMed Central. Bone Loss Following Oophorectomy Among High-Risk Women That rate of loss is considerably faster than the roughly 1 to 2 percent per year women lose in the early years of natural menopause.
Whether that accelerated bone loss always translates into more broken bones is less clear-cut. A meta-analysis found that bilateral oophorectomy was associated with about a 17 percent higher risk of fracture compared to no oophorectomy, and the combined surgical group (oophorectomy plus hysterectomy versus no surgery) showed roughly a 50 percent increase in osteoporosis risk.6European Journal of Endocrinology. Hysterectomy, oophorectomy, and bone health: a systematic review and meta-analysis However, a large registry study of over 25,000 nurses found no statistically significant link between bilateral oophorectomy at any age and fragility fractures, though the trends pointed toward increased risk in women who had surgery before 51.7PubMed Central. Risk of Fracture After Bilateral Oophorectomy The take-home: bone loss is real and measurable, but fracture risk depends on many other factors including exercise, calcium intake, body weight, and whether hormone therapy is used.
Brain Health and Dementia
Some of the most concerning research involves cognition. Estrogen receptors are concentrated in brain regions involved in memory and learning, and removing the ovaries early appears to put those regions at a disadvantage over time. A study of older women found that, among those who had surgical menopause, an earlier age at surgery was tied to faster decline in global cognition and episodic memory, and to more Alzheimer’s disease-related brain changes at autopsy.8PubMed Central. Age at surgical menopause influences cognitive decline and Alzheimer pathology in older women
A separate population-based study reported that women who had oophorectomy before natural menopause had about a 46 percent higher risk of cognitive impairment or dementia, with the risk climbing the younger the woman was at surgery.9PubMed. Increased risk of cognitive impairment or dementia in women who underwent oophorectomy before menopause A systematic review and meta-analysis reinforced this pattern: surgical menopause at any age showed a trend toward higher dementia risk that did not quite reach statistical significance, but early surgical menopause (at or before age 45) was associated with a 70 percent increase.10PubMed. Surgical menopause in association with cognitive function and risk of dementia: A systematic review and meta-analysis The younger a woman is when she loses ovarian hormones, the steeper the cognitive penalty appears to be decades later.
Depression, Anxiety, and Emotional Health
The abrupt estrogen withdrawal also hits serotonin and dopamine pathways in the brain, and the emotional consequences can be severe. A prospective study following women who had risk-reducing bilateral salpingo-oophorectomy found that clinically significant depressive symptoms roughly doubled within three months of surgery, persisting at 12 months. Anxiety symptoms nearly tripled at three months before eventually returning to baseline around one year.11PubMed. What happens after menopause? (WHAM): A prospective controlled study of depression and anxiety up to 12 months after premenopausal risk-reducing bilateral salpingo-oophorectomy Those women carried a threefold higher risk of chronic depressive symptoms compared to the comparison group.
Cross-sectional data from India echoed these findings: women in surgical menopause had depression scores roughly three times higher than women in natural menopause, and significant anxiety was present in about a quarter of the surgical group versus about 8 percent of the natural menopause group.12PubMed Central. Impact of Surgical Menopause versus Physiological Menopause on Quality of Life and Mental Health: A Cross-sectional Study in Eastern Part of India The abrupt loss of estrogen’s influence on serotonin and dopamine pathways is likely a major contributor.
Metabolic and Body Composition Changes
Weight gain and shifts in where fat is stored are common complaints after oophorectomy. A nationally representative U.S. study found that women who had oophorectomy before age 40 had significantly higher body fat percentage, larger waist circumference, and greater skinfold thickness compared to women with intact ovaries. They were nearly three times as likely to have body fat in the highest third of the distribution. The association grew even stronger when women who used hormone therapy were excluded from the analysis.13PubMed Central. Association of bilateral oophorectomy and body fatness in a representative sample of US women Women who had surgery after age 40 did not show the same degree of difference, suggesting the metabolic impact is most pronounced when the hormonal cliff comes early.
The metabolic picture goes beyond body fat. A Norwegian population study found that women who had bilateral oophorectomy before 50 had substantially higher rates of metabolic syndrome, with 47 percent meeting the criteria versus 36 percent of controls. Their Framingham cardiovascular risk scores were also elevated.14PubMed. Bilateral oophorectomy before 50 years of age is significantly associated with the metabolic syndrome and Framingham risk score In short, losing ovarian hormones early tends to push the body toward central fat storage, insulin resistance, and unfavorable lipid profiles.
Sexual Function and Body Image
Both desire and physical comfort during sex can be affected. Testosterone, roughly half of which comes from the ovaries, influences libido, and its loss often dampens desire. An older but frequently cited study found that oophorectomized women who did not receive hormone therapy reported significantly lower desire and arousal, along with poorer body image, compared to women who had other surgeries or no surgery at all. About a third of the control group reported positive changes in sexuality over the preceding five years; that effect was almost absent in the untreated oophorectomy group.15PubMed. Body image and sexuality in oophorectomized women
The picture with adequate hormone treatment looks different. A study comparing oophorectomized women on estrogen therapy to naturally menopausal women found that, despite having lower testosterone levels, the oophorectomized group actually reported lower rates of sexual dysfunction, less pain, better lubrication, and greater satisfaction. The catch was that they required about 50 percent higher estrogen doses to control vasomotor symptoms. Testosterone levels still correlated with desire, and estrogen levels correlated with arousal, but adequate replacement seemed to close much of the gap.16Europe PMC. Sexual Function Under Adequate Estrogen Therapy in Women After Oophorectomy Versus Natural Menopause
Overall Mortality
Perhaps the most sobering data involves overall life expectancy. A population-based cohort study found that women who had prophylactic bilateral oophorectomy before age 45 had 67 percent higher mortality than women in the reference group, driven mainly by cardiovascular and other non-cancer causes. The increased risk was concentrated among women who did not receive estrogen therapy afterward.17PubMed. Survival patterns after oophorectomy in premenopausal women: a population-based cohort study The Nurses’ Health Study corroborated this: among women younger than 50 at hysterectomy, bilateral oophorectomy was linked to 41 percent higher all-cause mortality, but only in those who had never taken estrogen therapy.18PubMed Central. Long-term Mortality Associated with Oophorectomy versus Ovarian Conservation in the Nurses’ Health Study
Across cardiovascular, cognitive, and all-cause mortality data, the same pattern reappears: the risks of early oophorectomy are largest for women who do not receive hormone replacement. That consistency is what has made estrogen therapy such a central part of the post-oophorectomy conversation.
How Hormone Therapy Changes the Equation
Starting estrogen at the time of surgery and continuing until at least the average age of natural menopause (around 51 or 52) appears to offset most, though not all, of the increased risks associated with early oophorectomy. Data from the Mayo Clinic cohort support what researchers call the “timing hypothesis”: hormone replacement works best for the heart, bones, and nervous system when it begins as close to the onset of hormone deficiency as possible.19PubMed Central. Hormone replacement therapy in young women with surgical primary ovarian insufficiency
For women with BRCA mutations who undergo prophylactic oophorectomy, a common fear is that hormone therapy might increase breast cancer risk. A large study of BRCA1 mutation carriers found that overall use of hormone replacement after oophorectomy was not associated with increased breast cancer risk. However, the type of therapy mattered: after 10 years of follow-up, the cumulative incidence of breast cancer was 12 percent among women who used estrogen alone versus 22 percent among those on combined estrogen-plus-progesterone therapy.20JAMA Oncology. Hormone Replacement Therapy After Oophorectomy and Breast Cancer Risk Among BRCA1 Mutation Carriers Since women who have had both ovaries and uterus removed do not need progesterone to protect the uterine lining, estrogen-only therapy is often the default choice, which is reassuring given these data.
Non-Hormonal Options for Symptom Relief
Some women cannot or prefer not to take hormones, particularly those with hormone-receptor-positive breast cancer. Randomized trials have shown that several non-hormonal drugs reduce hot flashes effectively, including certain antidepressants (paroxetine, venlafaxine, desvenlafaxine, fluoxetine, citalopram) and anti-seizure medications (gabapentin, pregabalin).21PubMed Central. Nonhormonal management of hot flashes for women on risk reduction therapy In 2023, the FDA approved fezolinetant, a neurokinin-3 receptor antagonist that targets the brain’s thermoregulatory center directly. It offers a mechanistically distinct option with a favorable safety profile compared to hormonal therapy.22Dermatological Reviews. Fezolinetant: A Non‐hormonal NK3R Antagonist for the Treatment of Hot Flushes and Vasomotor Symptoms
These drugs primarily address vasomotor symptoms and do not replace the cardiovascular, bone, or cognitive protections that systemic estrogen may provide. For bone protection specifically, bisphosphonates or other osteoporosis drugs can be prescribed independently. The non-hormonal toolkit is growing, but it tends to address individual symptoms rather than the systemic hormone deficiency that underlies them.
When Only One Ovary Is Removed
Losing a single ovary is fundamentally different from losing both. The remaining ovary continues producing hormones, so women do not enter surgical menopause. Studies have found that women who had unilateral oophorectomy reached menopause at a similar age and had similar clinical pregnancy rates compared to women with two intact ovaries, though ovarian reserve (the number of available eggs) was reduced.23PubMed Central. Biological Impact of Unilateral Oophorectomy: Does the Number of Ovaries Really Matter?
That said, losing one ovary is not entirely without consequence. A longitudinal community-based study found that unilateral oophorectomy was associated with earlier natural menopause, roughly 1.8 years sooner on average. The effect was strongest when the surgery was done before age 40, with nearly fourfold higher odds of premature ovarian insufficiency and about twice the odds of early menopause compared to women who kept both ovaries.24BJOG: An International Journal of Obstetrics & Gynaecology. Unilateral Oophorectomy and Age at Natural Menopause: A Longitudinal Community‐Based Cohort Study25PubMed. The influence of unilateral oophorectomy on the age of menopause So while one ovary can do the job of two for a while, the cushion is thinner, and menopause arrives a bit earlier.
Prophylactic Surgery for BRCA Carriers
For women carrying BRCA1 or BRCA2 mutations, risk-reducing bilateral salpingo-oophorectomy is one of the most effective strategies available. Guidelines recommend the procedure between ages 35 and 40 for BRCA1 carriers and between 40 and 45 for BRCA2, given the different timelines of cancer risk.26PubMed Central. Risk-Reducing Bilateral Salpingo-Oophorectomy for BRCA Mutation Carriers and Hormonal Replacement Therapy: If It Should Rain, Better a Drizzle than a Storm The cancer-risk reductions are dramatic: one study found a 96 percent reduction in the risk of ovarian and related cancers, along with a 53 percent reduction in breast cancer risk.27PubMed. Prophylactic oophorectomy in carriers of BRCA1 or BRCA2 mutations Another reported a 75 percent reduction in the combined risk of breast cancer and BRCA-related gynecologic cancer.28PubMed. Risk-reducing salpingo-oophorectomy in women with a BRCA1 or BRCA2 mutation
The trade-off is that these women undergo surgical menopause at a young age, making the quality-of-life effects discussed throughout this article especially relevant. A non-randomized controlled trial comparing women who had their tubes removed first (salpingectomy, with oophorectomy delayed) versus those who had everything removed at once found that the salpingo-oophorectomy group experienced substantially worse menopausal symptoms and a decline in sexual function scores. Hormone therapy narrowed the gap but did not eliminate it entirely.29JAMA Network. Association of Salpingectomy With Delayed Oophorectomy Versus Salpingo-oophorectomy With Quality of Life in BRCA1/2 Pathogenic Variant Carriers
Salpingectomy as a Middle Ground
Growing evidence that many ovarian cancers actually originate in the fallopian tubes has opened up a different surgical strategy: remove the tubes but leave the ovaries in place. Bilateral salpingectomy with ovarian conservation reduces ovarian cancer risk while preserving hormonal function.30The Obstetrician & Gynaecologist. Oophorectomy or ovarian conservation at the time of hysterectomy for benign disease A Cochrane review found that adding salpingectomy to a hysterectomy for benign conditions did not meaningfully affect ovarian hormone markers such as anti-Müllerian hormone.31PubMed Central. Hysterectomy with opportunistic salpingectomy versus hysterectomy alone
This approach is increasingly offered as “opportunistic salpingectomy” during hysterectomies performed for reasons unrelated to cancer. It avoids the cascade of hormonal consequences described throughout this article while still lowering one of the major cancer risks that historically justified removing the ovaries. For high-risk BRCA carriers, salpingectomy-first strategies with delayed oophorectomy are being studied as a way to buy women a few more years of ovarian function before the ovaries ultimately need to come out.
Pain Sensitivity After Ovarian Hormone Loss
A less-discussed consequence of oophorectomy involves changes in how the body processes pain. In animal models, removal of the ovaries leads to increased sensitivity to mechanical pain, a lower threshold at which pressure becomes painful. One study found that ovariectomized mice developed heightened mechanical pain sensitivity without showing changes in thermal or cold pain, suggesting the mechanism is specific rather than a generalized increase in all pain perception.32PubMed Central. Activation of GABAergic neurons in the dorsal raphe nucleus alleviates hyperalgesia induced by ovarian hormone withdrawal Emerging research ties this to changes in the gut microbiome that follow surgical menopause, which may drive inflammation in nerve tissue of the spinal cord.33PubMed. Dynamic changes in intestinal microbiota mediate mechanical hyperalgesia in surgical menopause model While most of this evidence comes from mouse studies, it aligns with clinical reports that chronic pain conditions become more common in postmenopausal women, and it opens up a line of research that may eventually change how pain after oophorectomy is managed.
The gut microbiome connection extends beyond pain. Mouse studies have shown that the composition of gut bacteria shifts after ovary removal, and that the altered microbiome may contribute to vaginal atrophy, one of the most persistent and undertreated symptoms of surgical menopause.34PubMed Central. Fecal microbiota transplantation mitigates vaginal atrophy in ovariectomized mice This research is still early-stage, but it hints at a future where the gut microbiome is considered part of the post-oophorectomy treatment picture, not just the hormones themselves.