Ovaries left in place during a hysterectomy keep working, but they don’t work exactly the same way as before. Even when both ovaries are carefully preserved, the surgery itself disrupts some of the blood supply that feeds them, and measurable markers of ovarian function tend to decline in the months and years that follow. The practical upshot is that women who have a hysterectomy with ovarian conservation reach menopause roughly two to four years earlier than women who keep their uterus. That shift, along with a cascade of hormonal and metabolic effects, is something many women are never told about before the surgery.
How Hysterectomy Disrupts Ovarian Blood Flow
The uterus and the ovaries share part of their blood supply through a network of interconnected vessels. When the uterus is removed, some branches of the uterine artery that also feed the ovary are inevitably cut or sealed. One study found that within days of a hysterectomy, peak blood-flow velocity in the ovarian arteries rose sharply while estradiol and progesterone levels dropped, consistent with the ovaries struggling to compensate for a reduced vascular bed.1PubMed. The effect of hysterectomy on ovarian blood supply and endocrine function At one and three months post-surgery, blood-flow resistance in the ovarian arteries was still elevated and estrogen levels remained lower than before the operation.
Not all research paints the same picture in the short term. A separate study using a different ovarian-reserve marker found no meaningful change in ovarian blood-flow indices or in anti-Müllerian hormone (AMH) levels up to three months after surgery, suggesting that the immediate disruption may be modest in some women.2European Journal of Obstetrics & Gynecology and Reproductive Biology. Change in the ovarian environment after hysterectomy as assessed by ovarian arterial blood flow indices and serum anti-Müllerian hormone levels The disagreement likely reflects differences in surgical technique, the specific vessels disrupted, and how individual anatomy varies. What the evidence agrees on is the direction of travel: over months to years, ovarian function after hysterectomy trends downward faster than it would have otherwise.
The Decline in Ovarian Reserve
AMH is produced by developing follicles in the ovary and serves as a useful gauge of how many eggs remain. A systematic review and meta-analysis pooling data from multiple studies found that women who had a hysterectomy showed significantly lower AMH levels compared with controls who did not have the surgery.3PubMed Central. Effect of hysterectomy on ovarian function: a systematic review and meta-analysis One study measured an average drop of about 14% in AMH just three days after the procedure, with the decline more pronounced in women who had a laparoscopic-assisted vaginal hysterectomy compared with an open abdominal approach.4PubMed Central. Effect of Hysterectomy on Ovarian Reserve in the Early Postoperative Period Based on the Type of Surgery
Why would the surgical approach matter? Laparoscopic techniques typically rely on electrocautery or energy-based devices to seal blood vessels near the ovary, and the thermal energy can spread to nearby ovarian tissue. One study found that laparoscopic hysterectomy was an independent risk factor for a meaningful AMH decline at two months after surgery, with roughly double the rate of significant decline compared with open surgery.5PubMed. Assessment of ovarian reserve after hysterectomy: Laparoscopic vs. non-laparoscopic surgery A more recent prospective comparison of total laparoscopic and total abdominal hysterectomy, however, found similar declines in estrogen and similar rises in FSH at six months regardless of technique.6PubMed Central. Comparison of the effects of total laparoscopic hysterectomy and total abdominal hysterectomy on ovarian reserve and sexual function: a non-randomised prospective study The takeaway for patients is that while there may be small differences between techniques, no approach to hysterectomy fully protects the ovaries from some functional decline.
Menopause Arrives Earlier
The cumulative effect of reduced blood flow and accelerated follicle loss is an earlier menopause. A prospective cohort study following women for several years after surgery found that those who had a hysterectomy faced nearly twice the risk of ovarian failure compared with women whose uteruses were intact. About 15% of the hysterectomy group experienced ovarian failure within four years, compared with 8% of the control group, a difference that translated to menopause arriving roughly two years sooner.7PubMed Central. Effect of Hysterectomy With Ovarian Preservation on Ovarian Function That risk was highest among women who also had one ovary removed alongside the hysterectomy, but it was still significantly elevated even when both ovaries were preserved.
A separate prospective cohort found a similar signal: women who entered surgery with healthy hormone levels reached menopause about 3.7 years earlier than a comparison group, independent of body weight, smoking, or whether one ovary had been taken out.8PubMed. The association of hysterectomy and menopause: a prospective cohort study The challenge for women and their doctors is that there is no way to know in advance exactly how much a given woman’s menopause will shift. The two-to-four-year range is a population average; for some women the effect may be negligible, while for others it could be considerably larger.
One practical complication: because the uterus has been removed, there are no periods to track. That means a woman who has had a hysterectomy with ovarian conservation has no obvious external signal when her ovaries finally stop working. She may experience hot flashes, sleep disruption, or mood changes, but these symptoms can creep in gradually and be attributed to other causes. Without a menstrual calendar, the transition into menopause can go unrecognized for months or even years.
Cysts, Pain, and the Retained-Ovary Problem
Ovaries that remain after a hysterectomy sometimes develop functional cysts. One study found that about 3.6% of women developed an ovarian cyst within six months of their hysterectomy, with some resolving on their own and others requiring additional surgery.9PubMed Central. Ovarian function and ovarian blood supply following premenopausal abdominal hysterectomy A comparison study showed that the rate of new cyst formation after hysterectomy was lower than the rate seen with certain hormonal intrauterine devices, but cysts after hysterectomy can be harder to evaluate because the altered pelvic anatomy makes ultrasound interpretation trickier.10PubMed. Comparison of ovarian cyst formation in women using the levonorgestrel-releasing intrauterine system vs. hysterectomy
A more troublesome complication is residual ovarian syndrome, where one or both preserved ovaries become encased in scar tissue after surgery and cause chronic pelvic pain, pain during sex, or a pelvic mass.11PubMed. Residual ovarian syndrome: A case report with classic symptoms, imaging and pathology findings, and treatment Diagnosis and surgical removal of a trapped ovary are frequently difficult, because the ovary may be fixed to the pelvic sidewall or bowel by adhesions.12PubMed. Chronic pelvic pain caused by residual ovaries and ovarian remnants This is different from ovarian remnant syndrome, which happens when tiny fragments of ovarian tissue are unintentionally left behind during a surgery intended to remove the ovaries entirely. In that case, the remnant can regrow, produce hormones, and cause pain or a mass even though the patient was told all ovarian tissue had been taken out. Risk factors include a history of endometriosis, pelvic inflammatory disease, and multiple prior surgeries.13PubMed. Ovarian remnant syndrome
Cardiovascular and Metabolic Consequences
The hormonal environment after hysterectomy appears to nudge cardiovascular and metabolic risk upward, though researchers still debate how large that nudge is and how much of it stems from the surgery itself versus the population of women who undergo it. A cohort study following women with ovarian conservation found they had modestly elevated risks of high cholesterol, high blood pressure, obesity, irregular heart rhythms, and coronary artery disease compared with age-matched women who did not have a hysterectomy.14PubMed Central. Cardiovascular and metabolic morbidity after hysterectomy with ovarian conservation: a cohort study These were not dramatic increases, on the order of a 13% to 33% higher relative risk depending on the condition, but they were consistent across multiple cardiovascular outcomes.
The picture shifts when the ovaries are actually removed. In the Nurses’ Health Study, bilateral oophorectomy was associated with an increased risk of coronary heart disease, with the strongest signal in women who had their ovaries removed before age 45. Over 24 years of follow-up, the study estimated that for every 130 women who undergo bilateral oophorectomy, one additional death from heart disease would occur that would not have happened with ovarian conservation.15PubMed Central. Ovarian Conservation at the Time of Hysterectomy and Long-Term Health Outcomes in the Nurses’ Health Study
Complicating the story, data from the Study of Women’s Health Across the Nation found that the annual rate of change in cardiovascular risk factors did not differ substantially between women who had a hysterectomy and those who did not, regardless of whether the ovaries were kept or removed.16PubMed Central. Changes in cardiovascular risk factors by hysterectomy status with and without oophorectomy: Study of Women’s Health Across the Nation The authors concluded that hysterectomy in midlife was unlikely to accelerate cardiovascular risk. The tension between these findings remains unresolved, but the weight of evidence leans toward a real, if modest, cardiovascular cost when the ovaries are removed in younger women.
Bone Health After Hysterectomy
Estrogen is a key protector of bone density, so it is no surprise that losing ovarian function faster leads to bone changes. Among women who had both ovaries removed, bone mineral density at the lumbar spine dropped by roughly 8.5% over 18 months, and hip density dropped by about 5.7%, even without other osteoporosis risk factors.17PubMed Central. Bone Loss Following Oophorectomy Among High-Risk Women: An NRG Oncology/Gynecologic Oncology Group study That’s a steep decline in a short window.
A large Korean cohort study found that women who had a hysterectomy without any ovarian surgery still had a roughly 28% higher risk of developing osteoporosis within the first seven years after surgery compared with women who did not have a hysterectomy, though the risk evened out after that period. Women whose hysterectomy also involved an adnexal procedure faced a 56% higher risk within seven years, and that elevated risk persisted beyond the seven-year mark.18JAMA Network Open. Osteoporosis and Fracture Risk Following Benign Hysterectomy Among Female Patients in Korea A recent meta-analysis confirmed the trend: bilateral oophorectomy carried a roughly 17% higher fracture risk, and hysterectomy without oophorectomy was still associated with a significantly higher risk of osteoporosis compared with no surgery at all.19European Journal of Endocrinology. Hysterectomy, oophorectomy, and bone health: a systematic review and meta-analysis
Cognitive and Mental Health Effects
The brain has estrogen receptors throughout, and emerging research links earlier loss of ovarian hormones to faster cognitive decline. A combined analysis of two large cohorts suggested a stepwise increase in dementia risk that correlated with the extent of gynecological surgery: hysterectomy alone carried some additional risk, hysterectomy with removal of one ovary carried more, and hysterectomy with removal of both ovaries carried the most. The risk was greater when the surgery occurred at a younger age.20PubMed Central. Hysterectomy, Oophorectomy, Estrogen, and the Risk of Dementia A systematic review and meta-analysis of surgical menopause reinforced this, finding that early surgical menopause (before age 45) was associated with a 70% higher risk of dementia, along with faster declines in verbal memory, processing speed, and other cognitive measures.21PubMed. Surgical menopause in association with cognitive function and risk of dementia: A systematic review and meta-analysis
Mental health effects beyond cognition are also in the picture. A cohort study with over two decades of follow-up found that women who had a hysterectomy, even with their ovaries preserved, had a roughly 26% higher risk of developing depression and a 22% higher risk of developing anxiety compared with matched controls.22PubMed Central. Long-term risk of de novo mental health conditions after hysterectomy with ovarian conservation: a cohort study Removing the ovaries on top of the hysterectomy was associated with an even stronger correlation with depression than hysterectomy alone.23Scientific Reports. Correlation analysis of hysterectomy and ovarian preservation with depression These findings are not universal. Another study, looking at mood trajectories around the time of menopause, found no significant difference in depressive or anxiety symptoms between women who had a hysterectomy (with or without oophorectomy) and women who went through natural menopause.24PubMed Central. Mood Symptoms After Natural Menopause and Hysterectomy With and Without Bilateral Oophorectomy Among Women in Midlife The discrepancy probably reflects differences in follow-up length, how mental health was measured, and the underlying reasons women had surgery in the first place.
The Case for Keeping Ovaries, and When Removal Still Makes Sense
For most women having a hysterectomy for a non-cancerous condition, the evidence strongly favors leaving the ovaries in place. Over 28 years of follow-up in the Nurses’ Health Study, women who had both ovaries removed at the time of hysterectomy had a 13% higher rate of death from all causes compared with women whose ovaries were conserved.25PubMed Central. Long-term Mortality Associated with Oophorectomy versus Ovarian Conservation in the Nurses’ Health Study A large population-based study echoed this, finding that ovarian conservation was associated with significantly lower hazards of death from all causes, ischemic heart disease, and cancer compared with bilateral removal in premenopausal women.26PubMed. Removal of all ovarian tissue versus conserving ovarian tissue at time of hysterectomy in premenopausal patients with benign disease: study using routine data and data linkage
Age matters. A large cohort study found that bilateral oophorectomy was associated with increased mortality in women under 50, but in women aged 50 to 54, the association actually reversed, with removal linked to slightly lower mortality. In women 55 and older, there was no significant difference either way.27PubMed. Association of bilateral salpingo-oophorectomy with all cause and cause specific mortality: population based cohort study This suggests that the protective value of the ovaries diminishes as a woman approaches natural menopause and her ovaries wind down on their own. Still, at no age in currently available data does elective oophorectomy appear to offer a survival benefit for average-risk women.28PubMed. Ovarian conservation vs removal at the time of benign hysterectomy
The calculus changes for women at high genetic risk for ovarian cancer, particularly carriers of BRCA1 or BRCA2 mutations. For these women, the lifetime risk of ovarian cancer is high enough that prophylactic oophorectomy is often recommended, typically after childbearing is complete. The harms of early estrogen loss are real but are outweighed by the cancer-risk reduction in this population.
Salpingectomy as a Middle Path
Growing evidence that many high-grade ovarian cancers actually start in the fallopian tubes has shifted surgical thinking.29PubMed Central. Uptake and Predictors of Opportunistic Salpingectomy for Ovarian Cancer Risk Reduction in the United States Removing the fallopian tubes at the time of hysterectomy while leaving the ovaries intact, a strategy called opportunistic salpingectomy, has been associated with a 49% to 77% reduction in ovarian cancer risk in modeling studies.30PubMed Central. Opportunistic salpingectomy during gynecologic and non-gynecologic abdominopelvic procedures for ovarian cancer primary prevention: a cost-effectiveness analysis Because this approach spares the ovaries, it preserves hormonal function while still cutting cancer risk. Many surgical guidelines now recommend that surgeons discuss salpingectomy with patients any time a hysterectomy is planned. One caveat: a Cochrane review found no direct clinical trial data yet comparing long-term ovarian cancer rates in women who had salpingectomy versus those who did not, so the estimated risk reduction comes from observational and modeling data rather than randomized evidence.31PubMed Central. Hysterectomy with salpingectomy versus hysterectomy alone
Hormone Therapy After Oophorectomy
When both ovaries are removed, AMH drops to undetectable levels almost immediately, confirming that all ovarian tissue is gone.32PubMed Central. Anti-Müllerian Hormone Decline in Patients Undergoing Hysterectomy With and Without Oophorectomy Compared With Natural Menopause The resulting instant menopause can be more abrupt and more symptomatic than a natural transition. Hormone therapy becomes a pressing question rather than an optional one, particularly for younger women.
For women who have had both the uterus and ovaries removed, estrogen-only therapy (without a progestogen) is typically recommended, since the main reason for adding progestogen to hormone therapy is to protect the uterine lining from estrogen-driven overgrowth, a concern that no longer exists.33PubMed Central. Hormone replacement therapy in young women with surgical primary ovarian insufficiency Data from the Women’s Health Initiative trial showed that among women aged 50 to 59 who had previously undergone bilateral oophorectomy, estrogen therapy was associated with a roughly 32% lower risk of death from all causes during long-term follow-up, a benefit not seen in older women or in women whose ovaries had been left in place.34PubMed Central. Menopausal Estrogen-Alone Therapy and Health Outcomes in Women With and Without Bilateral Oophorectomy: A Randomized Trial The implication is that replacing the hormones a young woman’s ovaries would have made is not merely about managing hot flashes; it appears to offset at least some of the mortality cost of early ovarian loss.
Sexual Function and the Role of Ovarian Androgens
Ovaries produce more than estrogen. They are also a significant source of testosterone and other androgens, which play a role in libido, arousal, and overall sexual satisfaction. When both ovaries are removed, androgen levels drop sharply. A study comparing oophorectomized women on estrogen replacement with women who kept their ovaries found that those without ovaries reported less sexual pleasure, lower libido, and reduced lubrication, even though they were receiving estrogen.35PubMed. Elective ovarian removal and estrogen replacement therapy–effects on sexual life, psychological well-being and androgen status Estrogen replacement alone does not fully replicate what intact ovaries provide, which is part of why some clinicians consider adding low-dose testosterone for women who have lost both ovaries and experience persistent sexual complaints.
The Symbolic Weight of Ovaries
Beyond hormones and disease risk, the decision about whether to keep or remove ovaries carries emotional significance for many women. Qualitative research has found that women often place symbolic value on their ovaries as a marker of femininity and biological normalcy, even when the physiological benefits of keeping them are uncertain.36Gender & Society. Hormonal Hierarchy This is not an irrational attachment. The ovaries are the body’s primary source of reproductive hormones, and their presence shapes a woman’s endocrine environment for decades. The sense of loss that some women describe after oophorectomy reflects a real physiological change, not just an imagined one. Surgeons who dismiss these feelings as purely psychological are missing the point: the ovaries do something, and women can feel the difference when they are gone.