Key points

●      Vulvar and vaginal tissue makes hormones locally but cannot make DHEA.

●      After menopause, adrenal DHEA is the main source of that raw material.

●      DHEA output falls 1–2% per year; by age 70–80 DHEA-S is ~30% of peak values in women.

●      Cortisol is preserved or rises over the same period, so the cortisol:DHEA-S ratio climbs.

Where does the raw material come from?

After menopause, adrenal DHEA is the principal precursor available to peripheral tissue.[3]

Vulvar and vaginal tissue converts DHEA into active androgens inside its own cells — but it carries almost none of the machinery to build DHEA itself, and depends on what arrives from circulation.[4] → Intracrine Hormone Signaling

So there are two separate questions. What the tissue can do with DHEA is one. How much DHEA reaches it is another — and that is an adrenal question, not a tissue question.

This article is about the second.

What happens to DHEA with age?

Adrenal DHEA output declines by 1–2% per year — one of the largest endocrine changes in human aging — while cortisol is preserved or rises.[1]

The cause of the DHEA decline is not competition for shared substrate. It appears to reflect selective depletion of cells in the zona reticularis — the adrenal layer that produces DHEA — while the cortisol-producing layer is preserved.[1] The underlying mechanism remains unclear.

The two hormones also act in opposition — cortisol is immunosuppressive, DHEA immune-enhancing — so the shifting ratio is used as a marker of stress-system state rather than either hormone alone.[1]

Does chronic stress lower DHEA?

An elevated cortisol-to-DHEA-S ratio is associated with chronic stress, and reduced DHEA-S is a consistent finding in major depressive disorder.[1]

Two cautions matter here, because this is where consumer health content usually overreaches.

These are associations. The relationship between stress, the HPA axis and aging is explicitly correlational rather than causal in the review literature.[1] Whether chronic stress causes lower DHEA output, or whether both reflect something upstream, is not settled.

The "pregnenolone steal" explanation is not supported. You may have read that cortisol demand diverts shared substrate away from DHEA production. That mechanism circulates widely in wellness content and is not what the endocrinology describes. The two hormones are made in different adrenal layers, and the age-related fall in DHEA is attributed to selective loss of the DHEA-producing layer — not to substrate being diverted elsewhere.[1]

Does this affect vulvar tissue?

This is the honest answer: it is a reasonable inference, and it has not been demonstrated.

The reasoning is straightforward. Vulvar and vaginal tissue depends on circulating DHEA as substrate.[4] DHEA output is measurably lower with age, chronic stress and depression.[1] Less substrate arriving means less available for local conversion.

Each step rests on established findings. The connection between them has not been studied. No trial has examined whether cortisol:DHEA ratio predicts vulvovaginal symptoms, or whether stress reduction changes tissue outcomes.

We think the inference is worth stating because it is mechanistically coherent and because it points somewhere useful. We are not going to present it as more than it is.

What else modifies how tissue responds?

Three systemic factors influence tissue behaviour independently of hormone supply. Each is well described in general physiology; none has been specifically studied in vulvovaginal tissue.

That last one is worth naming plainly: when dryness varies with a bad week, that is neurovascular, not psychological. The distinction matters, because women reporting fluctuating symptoms are frequently told the problem is in their head.

*(What changes in the tissue itself: What Causes Vaginal Dryness.)*

What does this mean practically?

It means supply and context are worth attention alongside the tissue itself — sleep, stress load, recovery, inflammatory burden and metabolic health are the levers that plausibly affect what reaches the tissue.

Two honest caveats.

Nothing here replaces medical assessment. Persistent symptoms need evaluation. If a clinician has recommended treatment, this is not a reason to decline it. → Why Estrogen Isn't Enough

Do not measure your own DHEA and act on it. There is no established relationship between an individual's DHEA level and her symptoms, and no test of tissue-level conversion capacity.[4]

Frequently asked questions

Can stress cause vaginal dryness? Stress is associated with lower DHEA-S and a higher cortisol-to-DHEA-S ratio, and vulvovaginal tissue depends on DHEA as substrate.[1,4] A direct causal link between stress and vaginal dryness has not been demonstrated.

Should I test my cortisol-to-DHEA-S ratio? It is used in research as a marker of stress-system state, but there is no established relationship between it and vulvovaginal symptoms, and no treatment threshold. Testing outside a clinical question is unlikely to give you usable information.

Is "adrenal fatigue" real? It is not a recognised medical diagnosis. The documented phenomenon is different and has its own name — adrenopause, the age-related fall in adrenal DHEA production, which occurs alongside preserved or rising cortisol.[1] That is a specific change in one adrenal layer, not global exhaustion of the gland.

Does DHEA come only from the adrenals after menopause? After ovarian production ends, adrenal DHEA is the principal precursor available to peripheral tissue.[3]

Will reducing stress improve my symptoms? Unknown for vulvovaginal symptoms specifically — no study has tested it. There is evidence that stress management and exercise improve the cortisol:DHEA ratio in other contexts.[1] Whether that translates to tissue outcomes has not been examined.

What's established, and what isn't

Established: adrenal DHEA output falls 1–2% per year, reaching ~30% of peak in women by age 70–80, while cortisol is preserved or rises; the cortisol:DHEA-S ratio climbs with age and is elevated in chronic stress and depression; the decline reflects selective depletion of the DHEA-producing adrenal layer; cortisol and DHEA have opposing immune effects; adrenal DHEA is the principal peripheral precursor after menopause; vulvovaginal tissue cannot synthesise DHEA.[1–4]

Inferred: that reduced adrenal DHEA output meaningfully limits substrate available to vulvovaginal tissue, and that inflammatory, metabolic and autonomic state modify tissue response. Mechanistically coherent; not demonstrated.

Not established: any causal link between stress and vulvovaginal symptoms; any predictive value of cortisol:DHEA ratio for these symptoms; any evidence that stress reduction changes vulvovaginal outcomes specifically. The "pregnenolone steal" mechanism is not supported, and the cause of the age-related DHEA decline remains unclear.

Educational note: For educational purposes only; not intended to diagnose, treat, cure or prevent any medical condition. Persistent or new symptoms should be evaluated by a qualified healthcare provider.

By Laura Kelly, DAOM, L.Ac., Dipl. OM

ORCID 0000-0001-6586-7308. 

More about Dr. Kelly

References

1.   Yiallouris A, Tsioutis C, Agapidaki E, Zafeiri M, Agouridis AP, Ntourakis D, Johnson EO. Adrenal aging and its implications on stress responsiveness in humans. Front Endocrinol. 2019;10:54. doi:10.3389/fendo.2019.00054 — verified

2.   Baulieu EE, Thomas G, Legrain S, et al. Dehydroepiandrosterone (DHEA), DHEA sulfate, and aging: contribution of the DHEAge Study to a sociobiomedical issue. Proc Natl Acad Sci U S A. 2000;97(8):4279–4284.

3.   Labrie F. Intracrinology and menopause: the science describing the cell-specific intracellular formation of estrogens and androgens from DHEA and their strictly local action and inactivation in peripheral tissues. Menopause. 2019;26(2):220–224. doi:10.1097/GME.0000000000001177

4.   Cellai I, Di Stasi V, Comeglio P, et al. Insight on the intracrinology of menopause: androgen production within the human vagina. Endocrinology. 2021;162(2):bqaa219. doi:10.1210/endocr/bqaa219