After menopause, your ovaries shrink significantly, stop releasing eggs, and lose most of their blood supply, but they don’t shut down entirely. They continue producing hormones, particularly androgens like testosterone, for up to a decade or more after your last period. Understanding what’s still happening inside these small organs helps explain why they matter long after fertility ends.
How Ovaries Shrink and Change Shape
The most visible change is size. During your reproductive years, an average ovary has a volume of about 9.8 cubic centimeters, roughly the size of a large grape. After menopause, that drops to around 5.8 cubic centimeters, according to ultrasound measurements from Johns Hopkins researchers, and continues to decrease over time. On an ultrasound, postmenopausal ovaries look smaller, denser, and more uniform in texture compared to the varied, follicle-dotted appearance they have during fertile years. You may still see occasional small follicle-like structures, but nothing that’s actively maturing or preparing for ovulation.
Internally, the soft, egg-rich tissue of the ovarian cortex is gradually replaced by fibrous tissue. This process, called stromal fibrosis, involves the buildup of connective tissue where follicles and active cells once lived. The ovarian surface thickens, and the tissue becomes progressively stiffer. Blood flow to the ovaries also drops measurably. Doppler imaging shows that the resistance in the ovarian artery increases after menopause, meaning less blood is reaching the organ compared to the rich supply it received during ovulation. This reduced blood flow both reflects and accelerates the shrinking process.
Follicle Depletion and the End of Ovulation
You’re born with all the egg-containing follicles you’ll ever have, roughly one to two million. By puberty that number has already dropped to a few hundred thousand, and the decline continues steadily through your reproductive life. The final menstrual period is essentially a marker for when follicle numbers have fallen below the threshold needed to sustain a regular cycle. Throughout perimenopause, the count drops sharply, and by the time periods stop entirely, only a tiny residual population may remain.
It’s worth noting that menstruation doesn’t always end purely because of follicle depletion. In some women, cycles stop due to thyroid or pituitary issues even while some follicles remain. And in others, vaginal bleeding can persist beyond true follicle depletion if estrogen is being produced by fat tissue. But for most women, the final period and follicle exhaustion are closely linked events.
Hormones Your Ovaries Still Produce
This is perhaps the most underappreciated part of the story. Postmenopausal ovaries are not hormonally dead. While estrogen production drops dramatically (since estrogen depends on maturing follicles), your ovaries continue secreting androgens, including testosterone and androstenedione. This happens because rising levels of luteinizing hormone (LH), the same signal that once triggered ovulation, keep stimulating the ovarian tissue that produces these hormones.
Research published in Menopause Review confirms that ovaries remain hormonally active for up to 10 years after menstruation ends. These androgens play a role in maintaining bone density, muscle mass, energy levels, and sex drive. Some of the testosterone your ovaries produce also gets converted into small amounts of estrogen in fat and other peripheral tissues, providing a low but meaningful baseline of estrogen even after menopause. This ongoing hormonal contribution is one of the key reasons the decision to surgically remove ovaries is more complex than it might seem.
Surgical Removal vs. Natural Menopause
When ovaries are surgically removed (bilateral oophorectomy), the hormonal shift is immediate and total rather than gradual. Research comparing surgical and natural menopause found that women who had their ovaries removed experienced significantly higher rates of hot flushes, sweating, memory difficulties, changes in sexual desire, and osteoporosis, particularly in the hip. The abrupt loss of both estrogen and the androgens that ovaries would otherwise continue producing accounts for these differences.
Metabolic syndrome rates were similar between the two groups (about 48% in surgical menopause versus 40% in natural menopause, a difference that was not statistically significant). But the bone and symptom differences are substantial enough that doctors now weigh the decision to remove healthy ovaries much more carefully, even during surgery for other reasons. The hormones your postmenopausal ovaries produce, while modest, provide a real protective buffer.
Ovarian Cysts After Menopause
Finding a cyst on a postmenopausal ovary sounds alarming, but small simple cysts are actually common and overwhelmingly benign. Cysts between 1 and 3 centimeters represent the most common size range in postmenopausal women, accounting for over 40% of detected cysts. In a study tracking these cysts over an average of 5.4 years, virtually all remained stable or resolved on their own. Only one out of more than 200 ovarian cysts in that size range grew larger, and even that one turned out to be benign after surgery.
Current guidelines use 3 centimeters as the threshold for follow-up. Simple cysts below that size typically require only routine monitoring rather than intervention. Cysts that are larger, have irregular features, or contain solid components get closer evaluation, since postmenopausal ovaries are no longer cycling through the normal follicle growth that explains most premenopausal cysts.
Ovarian Cancer Risk After Menopause
Menopause itself is a recognized risk factor for ovarian cancer, and the majority of cases are diagnosed after periods have stopped. Globally, ovarian cancer is most commonly diagnosed between ages 60 and 64, with a typical age of 63 at diagnosis. About 90% of cases occur in women over 45, and 80% in women over 50.
The most common type, epithelial ovarian cancer, is diagnosed after menopause roughly 58% of the time, with serous and endometrioid subtypes showing even higher postmenopausal rates (around 60%). Other types follow different patterns: germ cell tumors overwhelmingly affect younger women, with 75% diagnosed before age 30, and sex cord tumors split more evenly across age groups.
Several factors tied to lifetime hormonal exposure influence risk. Early first periods and late menopause both increase lifetime ovulation count, which correlates with higher risk. An earlier menopause is negatively correlated with developing ovarian cancer. Obesity and hormone replacement therapy during menopause are also identified risk factors. Because postmenopausal ovaries are small and often difficult to feel on a pelvic exam, imaging becomes more important for detection in this age group.
What a Normal Postmenopausal Ovary Looks Like
If you’ve had a pelvic ultrasound after menopause and wondered what the technician was seeing, here’s the picture: a small, homogenous, oval structure without the dark circles (follicles) that characterize a younger ovary. The tissue appears more uniform because the follicles that once gave it a varied texture are largely gone. Occasionally, a few small hypoechoic spots appear, remnants of follicular structures, but they’re inactive. Sometimes postmenopausal ovaries are so small they’re difficult to identify on ultrasound at all, which is normal and not a cause for concern.