Low AMH, DOR, and the Nervous System Behind Your Numbers

Sarah Clark recording fertility podcast low amh, dor and the nervous system

If you have low AMH or a diminished ovarian reserve diagnosis, the number is real, and you already know it matters. You have probably also had the feeling that it is not the whole story, and that the conversation ended before anyone explained what was driving it.

One factor that can sit upstream of that number is the nervous system. The stress response and the reproductive system share wiring in the brain, and when the stress side runs high for a long time, the reproductive side can get turned down. This rarely shows up on a standard workup, which can leave you sensing there is more to look at without knowing what to ask for.

Listen to the episode: Low AMH, Failed IVF, Told Donor Eggs? The Nervous System No One Checks

 

Here are five parts of that picture that you can bring back to your medical team.

Low AMH, DOR, and the stress response share the same wiring

The brain runs reproduction and the stress response from overlapping circuitry. When the body reads a sustained demand, it tends to prioritize getting through the day, and reproductive signaling can be turned down as a result. A 2017 review in the International Journal of Molecular Sciences describes how activation of the stress axis can suppress reproductive signaling at several levels, from the brain to the pituitary to the ovary itself. This does not mean stress alone sets your AMH. It means the environment your ovaries are working in may be part of the picture, and it is fair to ask whether anyone has looked at it.

Why one cortisol blood test rarely shows the full picture

If you have raised stress, you may have been told that your cortisol level looked fine. A single blood draw captures one moment. Cortisol is meant to follow a daily rhythm, higher in the morning and lower at night so you can sleep, and after a long stretch of demand, that rhythm can flatten or flip. A one-time number can miss this. A cortisol pattern measured across the day, sometimes through a DUTCH test, can show what a single draw does not. It is a reasonable thing to ask for if the 3 am waking and afternoon crashes sound familiar.

Thyroid antibodies behind a normal TSH

Many women are told their thyroid is fine on the basis of TSH alone. TSH is one marker. Thyroid antibodies and reverse T3 can be part of the picture even when TSH is in range, and stress physiology can affect them. Because thyroid function is connected to ovulation and egg quality, a full thyroid panel, including antibodies and reverse T3, is a fair request when symptoms continue after a normal TSH.

How cortisol can compete with progesterone

Cortisol and progesterone draw on shared raw material. When the body is meeting a constant demand for cortisol, progesterone can be what is left. Progesterone is often one of the first hormones to move, sometimes before AMH or FSH shift, and it is associated with a short luteal phase. Progesterone support sometimes has a place. The more useful question is why progesterone is low to begin with, which rarely gets asked when the focus stays on the reproductive numbers.

The nervous system inside the ovary and egg quality

The ovary is directly innervated by the sympathetic nervous system. In animal studies, changes in that nerve activity can influence how follicles develop, which places the stress response not just near the ovary but inside it. Sleep is part of this, too. Melatonin concentrates in the fluid around the developing follicle and acts as an antioxidant there. A small 2025 randomized trial in women with diminished ovarian reserve, published in the Journal of Ovarian Research, found that melatonin lowered markers of oxidative stress in the follicle and was associated with improvements in egg quality. It was a small study, so it is a signal rather than a settled answer, but it points to the same place. The environment around the egg is something you may be able to influence.

None of this means you failed, or that the work you have already done on stress was wasted. It means there may be a layer of physiology underneath your numbers that a standard workup rarely measures, and it is a layer you can ask about and, in many cases, support.

The Case for a Second Opinion

We review your timeline, your existing labs, and your IVF history, if applicable, and we identify what may have been missed before the next decision gets made.

We are not a substitute for your medical team. We work alongside them.

👉 Book a Functional Fertility Second Opinion here.

If you are not ready for a call yet but want to understand what may be missing in your existing workup, download What Your Clinic Missed.

👉 Email hello@fabfertile.ca, subject line MISSED

Related reading:

Diminished Ovarian Reserve: The Functional Fertility Approach

Low AMH in Context

When Stress Is the Missing Diagnosis: Nervous System Load and Fertility

The Myth of Poor Egg Quality, and Before You Choose Donor Eggs: A Functional Fertility Assessment.

About the Host

I'm Sarah Clark, founder of Fab Fertile and host of Get Pregnant Naturally, a podcast with over one million downloads. My functional fertility team works with couples navigating low AMH and failed IVF, reviewing functional lab results, gut microbiome, food sensitivity, vaginal microbiome, nutrigenomics, HTMA, DUTCH, toxin testing, and bloodwork alongside nervous system work, to help identify patterns that may not have been considered. We work alongside your medical team, not instead of them.

By Sarah Clark, founder of Fab Fertile, host of Get Pregnant Naturally (1M+ downloads), and author of Fabulously Fertile. Last reviewed June 2026.

References:
Joseph DN, Whirledge S. Stress and the HPA Axis: Balancing Homeostasis and Fertility. International Journal of Molecular Sciences. 2017, 18(10), 2224.
The effects of melatonin on follicular oxidative stress and ART outcomes in women with diminished ovarian reserve: a randomized controlled trial. Journal of Ovarian Research. 2025, 18(1), 5.
Metabolic control of ovarian function through the sympathetic nervous system. Frontiers in Endocrinology. 2024.