Can Ovarian Cysts Cause Hot Flashes?

Most ovarian cysts, on their own, do not directly cause hot flashes. The common fluid-filled cysts that form during a normal menstrual cycle come and go without disrupting your body’s temperature regulation in any meaningful way. But the relationship between ovarian cysts and hot flashes is more tangled than that reassuring sentence suggests, because certain rare ovarian growths can alter hormone levels enough to trigger flushing, and the medications used to treat cyst-related conditions are themselves a frequent cause of hot flashes.

What Actually Triggers a Hot Flash

Hot flashes happen when your brain’s internal thermostat misfires. A group of specialized nerve cells in the hypothalamus, known as KNDy neurons, helps regulate body temperature by controlling blood vessel dilation in the skin. When estrogen levels drop or fluctuate sharply, these neurons become overactive, essentially lowering the threshold at which your body decides it needs to cool down. The result is a sudden wave of heat, flushing, and sweating even when the room temperature hasn’t changed. Research in animal models has shown that when these KNDy neurons are destroyed, the skin blood-vessel dilation that characterizes a hot flash is consistently reduced, and the normal estrogen-driven regulation of skin temperature is disrupted.¹

The key takeaway is that hot flashes are fundamentally about estrogen signaling to the brain, not about the ovaries themselves. Your ovaries are the primary source of estrogen, so anything that significantly disrupts their estrogen output or causes sudden swings can set off the cascade. This is why menopause is the classic trigger: estrogen production drops permanently. But it also means any condition or treatment that sharply changes estrogen levels has the potential to cause hot flashes, whether or not a cyst is involved.

Why Routine Ovarian Cysts Rarely Cause Hot Flashes

Functional ovarian cysts, the kind that form when a follicle doesn’t release its egg or when the corpus luteum fills with fluid, are extremely common. Many women develop them every cycle without ever knowing. These cysts are part of normal ovarian function, and they typically resolve within one to three menstrual cycles. Because they form within the machinery of a working ovary, they don’t usually suppress estrogen production or cause the kind of hormonal crash that would narrow the thermoneutral zone in the brain.

If anything, some functional cysts produce extra estrogen. A follicular cyst, for instance, is an overgrown follicle that keeps making estrogen instead of releasing an egg. That doesn’t trigger hot flashes; if anything, it pushes estrogen levels up. The situation is different from perimenopause, where the ovaries become increasingly erratic. During the perimenopausal transition, estradiol levels can actually be higher than normal even as the overall hormonal pattern becomes chaotic, with progesterone levels and luteal phase lengths paradoxically decreasing.² That instability, not any specific cyst, is what drives perimenopausal hot flashes.

So if you’ve been diagnosed with a simple ovarian cyst and you’re also having hot flashes, the cyst is probably not the cause. The two may be coinciding because you’re in a stage of life where both are common, particularly in your late thirties or forties when functional cysts still occur and perimenopausal hormone shifts are beginning.

Hormone-Producing Ovarian Tumors Are the Exception

There is one category of ovarian growth that can genuinely cause hot flashes on its own: hormone-secreting ovarian tumors. These are not “cysts” in the typical sense, but they can be discovered during imaging for suspected cysts, and the distinction matters.

Granulosa cell tumors and fibrothecomas are examples of ovarian tumors that actively produce hormones. Some secrete estrogen, which can cause abnormal uterine bleeding rather than hot flashes. But others produce substances that suppress normal ovarian cycling without replacing estrogen, and that disruption can trigger menopausal-type symptoms. One documented case involved a fibrothecoma that produced only inhibin B, a hormone that suppresses the pituitary signals driving ovulation. The result was secondary amenorrhea (periods stopping) and hot flashes, because the tumor effectively shut down normal estrogen production without providing estrogen of its own.³

Granulosa cell tumors can also create hormonal havoc that leads to downstream symptoms including temperature instability.⁴ These tumors are rare, accounting for a small fraction of ovarian neoplasms. But they’re worth knowing about because if you’re premenopausal and experiencing hot flashes alongside irregular periods, and imaging reveals a solid-appearing ovarian mass rather than a simple fluid-filled cyst, hormone-producing tumors belong on the list of possibilities your doctor should consider.

The Surprising Disconnect Between PCOS and Hot Flashes

Polycystic ovary syndrome involves multiple small cysts on the ovaries and is one of the most common hormonal conditions in women of reproductive age. You might expect that having chronically disrupted ovarian function would predispose someone to hot flashes, especially as they approach menopause. The evidence says otherwise.

A study examining the relationship between PCOS and hot flashes during the midlife transition found that PCOS was not associated with increased odds of experiencing hot flashes.⁵ This is somewhat counterintuitive, but it may make sense when you consider the hormonal profile of PCOS. Women with PCOS tend to have higher androgen levels and often have relatively stable (if abnormal) estrogen levels. Their ovaries are dysfunctional in terms of ovulation, but they’re not experiencing the sharp estrogen withdrawal that triggers the thermoregulatory disruption behind hot flashes. The type of hormonal imbalance matters more than the simple presence of ovarian cysts.

This finding is useful to know if you have PCOS and are experiencing hot flashes. Rather than assuming the cysts are responsible, it’s worth investigating other explanations, whether that’s early perimenopause, a thyroid issue, or a medication side effect.

When the Treatment Causes Hot Flashes, Not the Cyst

Here is where the ovarian cyst and hot flash connection gets real for many women, just not in the way they might assume. Endometriomas, sometimes called “chocolate cysts,” are cysts caused by endometriosis. The cysts themselves don’t cause hot flashes, but the medications prescribed to treat endometriosis-related cysts frequently do.

GnRH agonists (gonadotropin-releasing hormone agonists) are a mainstay of endometriosis treatment. They work by temporarily shutting down the hormonal signals from the pituitary gland that stimulate the ovaries, creating a reversible menopausal state. The trade-off is predictable: suppressing ovarian estrogen production brings on menopausal symptoms, with hot flashes being one of the most common complaints. In studies of women receiving GnRH agonist therapy, hot flash and sweating scores increased significantly across all treatment groups.⁶

The severity of these medication-induced hot flashes can be substantial, and “add-back” therapy, where a small amount of estrogen or another hormone is given alongside the GnRH agonist, is often used to take the edge off without undermining the treatment’s purpose. Research on low-dose estrogen add-back found that hypoestrogenic symptoms like hot flashes and sweating were present but did not differ significantly between the add-back and control groups, suggesting the benefit of add-back for temperature symptoms can be modest.⁷

An alternative medication, dienogest, has gained traction partly because it causes fewer vasomotor side effects. A comparison of dienogest and GnRH agonists given before surgery for ovarian endometriomas found that the incidence of hot flashes was significantly lower with dienogest.⁸ Another randomized trial comparing the two drugs after laparoscopic surgery for endometriosis found no significant difference in hot flash rates between the dienogest and GnRH agonist groups, though overall side-effect profiles differed.⁹ The picture isn’t perfectly consistent across studies, but the general pattern is clear: GnRH agonists reliably cause hot flashes, and alternative medications may produce fewer of them.

If you’re experiencing hot flashes while being treated for endometriomas or other cyst-related conditions, the most likely culprit is the medication rather than the cyst. This matters practically because it means the hot flashes will typically stop when the medication course ends, and your doctor may be able to adjust the treatment approach if the symptoms are unbearable.

Other Causes Worth Ruling Out

One reason the “can ovarian cysts cause hot flashes” question persists is that hot flashes have a longer list of causes than most people realize. When someone with an ovarian cyst experiences hot flashes, the cyst draws suspicion simply because it’s the known medical issue. But the actual cause could be entirely unrelated.

The differential diagnosis of hot flashes extends well beyond the ovaries. Non-hormonal medical conditions that can produce flushing episodes include:

Carcinoid syndrome: tumors that release serotonin and other substances causing episodic flushing
Pheochromocytoma: an adrenal gland tumor that triggers adrenaline surges with flushing, sweating, and rapid heartbeat
Medullary thyroid carcinoma: a thyroid cancer that produces calcitonin, which can cause flushing
Systemic mast cell disease: an overproduction of mast cells leading to histamine-driven flushing
Neurological flushing: related to spinal cord injuries or autonomic nervous system dysfunction
Drug and alcohol reactions: certain medications, alcohol, and even food additives can trigger flushing episodes

A review of the differential diagnosis of hot flashes catalogued this wide range of causes, including flushing from emotional triggers, renal cell carcinoma, and pancreatic tumors.¹⁰ Most of these are uncommon, but they highlight why assuming an ovarian cyst is the source of your hot flashes can be misleading. If your hot flashes are severe, persistent, or accompanied by other symptoms like rapid heart rate, diarrhea, or sudden blood pressure spikes, the evaluation should extend beyond your reproductive system.

Perimenopause and Ovarian Cysts Coexisting

Perhaps the most common real-world scenario is a woman in her late thirties or forties who has both ovarian cysts and hot flashes, not because one is causing the other, but because both are manifestations of ovaries in transition. During perimenopause, follicles become less responsive to hormonal signals, leading to irregular ovulation. Sometimes a follicle grows but doesn’t release its egg, forming a functional cyst. At the same time, the erratic pattern of estrogen and progesterone production creates the hormonal volatility that drives hot flashes.

The perimenopausal period is defined by changes in ovarian hormones and their feedback relationships, typically beginning between ages 35 and 50, and the paradox is that estrogen levels are often elevated rather than low during this time, even as other markers of ovarian function decline.² It’s the instability, the swings between high and low, rather than steady low estrogen, that triggers symptoms in many perimenopausal women. Ovarian cysts during this period are fellow travelers, not drivers. Treating or removing a cyst in this context won’t address the hot flashes because the underlying hormonal turbulence will continue regardless.

Your doctor can usually distinguish perimenopausal hot flashes from other causes with a combination of your symptom history and blood tests measuring FSH and estradiol levels. If FSH is rising and your cycle is becoming irregular, perimenopause is the most parsimonious explanation for both the cysts and the flashes.

Newer Treatments Targeting the Hot Flash Mechanism Directly

Understanding the brain-based mechanism behind hot flashes has opened up new treatment avenues that bypass the ovaries entirely. Because KNDy neurons in the hypothalamus use a signaling molecule called neurokinin B, which acts through a receptor known as NK3, drugs that block that receptor can dampen hot flash activity without affecting estrogen levels at all.¹

Fezolinetant is one such drug, approved by the FDA for moderate-to-severe vasomotor symptoms. It represents an alternative for women who cannot or prefer not to use hormone therapy, which remains the most effective treatment for hot flashes but is contraindicated for some patients and viewed with hesitation by others.¹¹ For women dealing with ovarian cysts whose treatment is already causing hot flashes through hormonal suppression, an NK3 receptor antagonist could theoretically address the vasomotor symptoms without interfering with the cyst treatment, though clinical data on that specific combination is still limited.

The broader point is that hot flash management has moved beyond the simple framework of “replace the estrogen your ovaries aren’t making.” If your hot flashes are caused by medication you’re taking for an ovarian condition, or if they’re coinciding with cysts during perimenopause, there are now multiple pharmacological angles to explore with your doctor beyond traditional hormone replacement.

When an Ovarian Cyst Does Warrant Hot Flash Investigation

Given everything above, there are a few specific situations where an ovarian cyst and hot flashes should be evaluated together rather than dismissed as coincidence:

You’re premenopausal and your periods have stopped: If an ovarian mass is found alongside amenorrhea and hot flashes in a woman who should still be cycling, a hormone-producing tumor should be considered. Blood tests for inhibin, estradiol, AMH, and androgens can help clarify what the mass is doing hormonally.
You recently started endometriosis medication: GnRH agonists are the most likely medication cause. Discuss with your doctor whether switching to dienogest or adding back-therapy makes sense for your situation.
Imaging shows a solid or complex mass, not a simple cyst: Simple, thin-walled, fluid-filled cysts are almost always benign functional cysts. Solid components, thick septations, or blood flow within the mass raise the possibility of a tumor that could be hormonally active.
Your hot flashes came on abruptly and you’re not near menopause age: Hot flashes in a 25-year-old with an ovarian mass are a different clinical picture than hot flashes in a 48-year-old with a follicular cyst. The younger scenario deserves a more thorough hormonal workup.

For most women, though, the practical answer is reassuring. The small cyst your ultrasound found is almost certainly not why you’re having hot flashes. The two are likely parallel events driven by the same underlying hormonal shifts of aging, or the hot flashes are a side effect of treatment rather than the condition itself. Knowing the difference helps you focus your energy, and your doctor’s attention, on what’s actually causing the symptom rather than on the incidental finding that happened to show up on the same scan.