By Claire Johnson, Clinical Nutritionist (@claire_womenshealthnutrition). Published by MyOva.

---

When women think about hormone health, the focus is often on food, supplements or blood tests. These can matter, but there is another piece of the puzzle that gets overlooked: the nervous system.

Your nervous system plays a central role in how your body handles sleep, digestion, mood, metabolism and the signals that run your menstrual cycle. If your body is under constant pressure, whether physical, emotional or mental, hormone health can get harder to maintain.

Understanding how your nervous system works, and how to support it, is a useful and often missing part of women's health care, especially in a fast-paced, always-on world. This is what I wish someone had told me earlier. It's not a magic fix, but it is a foundation worth building.

In this guide:

• What do we mean by "nervous system health"?
• How stress affects hormones and menstrual cycles
• Stress, PMS and the nervous system
• The gut-brain-hormone connection
• Nervous system health and fertility
• What does the research say about calming practices?
• Practical ways to support your nervous system
• The bottom line

---

What Do We Mean by "Nervous System Health"?

The nervous system includes the brain, spinal cord and nerves. When we talk about stress and hormones, we're usually talking about the autonomic nervous system (ANS), which has two main branches:

• The sympathetic nervous system ("fight or flight"), which switches on during stress.
• The parasympathetic nervous system ("rest and digest"), which is involved in recovery, digestion and repair.

Both are essential. Problems arise when the body spends too much time in a heightened stress state and not enough in recovery.

Many of us live with chronic, low-grade stress. The usual culprits are busy schedules, work pressure, poor nutrition, short sleep, intense exercise, emotional load and constant digital stimulation. Even if life doesn't feel overwhelming, your body may still be treating it as ongoing pressure.

---

How Stress Affects Hormones and Menstrual Cycles

Stress isn't "just in your head". It causes real physiological changes. When your body perceives stress it releases cortisol, the main stress hormone. A short burst of cortisol is normal and useful. The question is what happens when the pressure doesn't let up.

What the research actually shows

In a prospective study that followed healthy women across their menstrual cycles, women who reported higher everyday stress had slightly lower progesterone in the second half of their cycle and higher odds of a cycle in which they did not ovulate [1]. The effect was modest, and most cycles in the study were still ovulatory. A stressful month does not automatically mean a broken cycle.

At the more extreme end, a combination of significant stress, under-eating and over-exercise can switch ovulation off altogether. This is called functional hypothalamic amenorrhoea, and it happens because the brain stops sending the signals that drive the cycle, the hypothalamic-pituitary-ovarian (HPO) axis [2].

Progesterone is the main hormone of the second half of your cycle, and it is only made in meaningful amounts after ovulation. If ovulation is weak or missing, women may notice:

• Short or irregular cycles
• Spotting before periods
• Difficulty conceiving

These signs have many possible causes, and stress is only one of them. If you notice them, it's worth speaking to your GP rather than assuming. Our guide to the signs of low progesterone explains what else to look at.

---

Stress, PMS and the Nervous System

PMS is often discussed as a purely hormonal issue. But women with PMS typically have normal hormone levels. What differs is how they respond to the normal monthly rise and fall of those hormones [3]. That raises an obvious question: does the nervous system play a part in that response?

Some small studies suggest it might. In studies of women with premenstrual syndrome or premenstrual dysphoric disorder (PMDD), researchers have found lower parasympathetic (calming) activity, measured through heart rate variability, either in the late luteal phase or during sleep [4, 5]. The findings are not consistent, though. One study found the difference in the first half of the cycle rather than just before a period, which hints that it may be a trait rather than a symptom of the luteal phase [6].

So the short version is this: the link is plausible and worth watching, but it's not settled. We don't yet know whether a lower calming tone drives PMS symptoms or is simply a consequence of feeling awful. If your symptoms are severe, our guide to PMDD versus severe PMS explains how to tell the difference and what to ask for.

---

The Gut-Brain-Hormone Connection

Your nervous system is closely connected to your digestive system through the gut-brain axis [7]. Many women notice bloating or changes in bowel habits when they're under pressure, and that's a real, recognised link.

It's easy to overstate the next step, so here is where the evidence sits. Human studies connecting psychological stress to the make-up of gut bacteria show small and inconsistent associations [8]. The gut microbiome is also thought to be involved in oestrogen metabolism, but most of that work comes from breast cancer research and doesn't tell us whether it explains everyday hormonal symptoms [9].

The practical takeaway is simple. If digestion is a problem for you, it's worth addressing in its own right, and stress management is one reasonable piece of that. Our guide to liver and gut health goes deeper.

---

Nervous System Health and Fertility

One way to think about it is that the body prioritises survival over reproduction. If it consistently reads your situation as stressful, it can down-regulate the reproductive system. At the extreme end that's the functional hypothalamic amenorrhoea described above [2].

For most women the picture is less dramatic. In the LIFE study, which followed couples trying for a baby, women with the highest levels of a stress marker in their saliva (alpha-amylase) were more likely to meet the clinical definition of infertility. The cycle-by-cycle difference in conception chances was borderline, and cortisol itself showed no link [10]. Because it was an observational study, it can't prove that stress was the cause.

This does not mean fertility challenges are caused by stress alone, or that you should simply "relax". Telling someone to relax is not a fertility plan. There is no good evidence yet that nervous system practices improve cycle regularity or the chance of conceiving. What they can do is help you cope with the strain of waiting, alongside proper investigation.

Important: nervous system support is a complement to medical care, never a replacement for it.

---

What Does the Research Say About Calming Practices?

The research on this is actually pretty clear in places, and patchy in others. Here is what has been tested:

• Yoga and mindfulness-based stress reduction. A meta-analysis of 42 randomised trials found that these practices were linked to lower cortisol and higher heart rate variability, with the clearest effect from yoga. They made no difference to inflammatory markers such as CRP or IL-6 [11].
• Slow breathing. A systematic review of 15 studies linked slow breathing to higher heart rate variability and lower anxiety and low mood. The studies were small, none were randomised trials, and cortisol wasn't measured [12].
• Forest bathing. A meta-analysis found lower salivary cortisol after short periods spent in forest environments [13].
• PMS specifically. A meta-analysis of yoga for PMS found improvements in overall symptom scores, although the trials varied a lot in design and quality [14].

Joy, laughter, time with people you like and stroking a pet (yes, that counts) are less well studied, but they cost nothing and carry no downside.

None of this means breathing treats PMS, or that meditation changes your hormone levels on its own. What these practices can do is lower the stress load your body is carrying, which is a sensible place to start.

---

Practical Ways to Support Your Nervous System

Supporting your nervous system doesn't need perfection or long, tedious routines. Small, consistent habits tend to work best.

1. Choose supportive movement

Exercise is good for you, but not all movement is calming. For many women, especially under high stress, lighter movement may suit some weeks better than others:

• Walking
• Yoga or Pilates
• Moderate resistance training

The goal is movement that leaves you feeling better, not depleted. If you train hard, eat little and your periods have become irregular or stopped, speak to your GP, because that combination is a recognised cause of missed periods [2].

2. Use breathing to calm the body

Slow, deliberate breathing is linked to higher heart rate variability, a marker of parasympathetic activity [12]. Helpful techniques include:

• Breathing with a longer exhale than inhale, exhaling through the nose
• Box breathing: inhale for 4, hold for 4, exhale for 4, hold for 4

There are lots of methods, apps and free tools online, so get curious and see what suits you. Aim for 3 to 5 minutes a day. Think you don't have time? Check your phone's screen time. Swapping five minutes of scrolling for deep breathing is usually easy to find.

3. Eat regularly and enough

Skipping meals or under-fuelling can act as a stress signal to the body. In one observational study, women who regularly skipped breakfast had a disrupted cortisol rhythm and higher blood pressure than women who ate it, though that can't tell us breakfast was the cause [15]. Supportive habits include:

• Eating regular, balanced meals
• Including protein and high-fibre carbohydrates in meals and snacks
• Avoiding long gaps without food and extreme fasting
• Eating enough to match what you're asking of your body, especially if you are active

To be clear, there's no good evidence that regular meals lower your cortisol directly. The point is that eating enough is a basic requirement for a working cycle [2]. Our article on blood sugar balance covers the practical side.

4. Protect your sleep and routines

In a study of women tracked across their cycles, each additional hour of sleep was associated with modestly higher oestradiol and luteal progesterone [16]. Consistent sleep times, meal timing and daily rhythms also make life more predictable, and many women find that lowers their overall stress load.

5. Reduce constant stimulation

Modern life keeps the nervous system in near-constant alert. Small changes can help:

• Phone-free meals
• Less screen time before bed
• Quiet walks without podcasts or music

---

The Bottom Line

Your nervous system and your hormones are closely linked. Stress can nudge progesterone down and, in extreme cases, switch ovulation off. The evidence for a calming practice fixing PMS or fertility is thin, but the evidence that these practices lower stress markers is decent.

If you're dealing with PMS, irregular cycles, fertility challenges, digestive issues or persistent fatigue, supporting your nervous system is a sensible foundation. It is not a substitute for getting symptoms properly investigated. Your body is trying to tell you something, so ask for the tests, and keep asking.

Hormone health isn't about doing more. Often it's about helping your body feel safe enough to do what it already knows how to do.

If you'd like to see what's in MyOva's Cycle Support, the full ingredient list and directions are on the product page. Food supplements are not a substitute for a varied diet, a healthy lifestyle or medical care.

---

Related Reading

• Blood Sugar Balance: An Underrated Tool for Women's Hormone Health
• Liver and Gut Health: The Missing Link in Hormonal Balance
• PMDD vs Severe PMS: How to Tell the Difference (And Why It Matters)
• Oestrogen Dominance: Is It Real? What the Research Says
• Week 1 Reset & Routine: Laying the Foundations for Hormonal Balance
• Week 8 Nourishment & Recovery: Supporting Your Body and Hormones

---

This article is for educational purposes only and does not constitute medical advice. MyOva products are food supplements, not medicines, and are not intended to diagnose, treat, cure or prevent any disease. Always consult your GP or pharmacist before starting a new supplement, particularly if you are pregnant, breastfeeding, on medication, or managing a diagnosed condition.

References

1. Schliep KC, Mumford SL, Vladutiu CJ, Ahrens KA, Perkins NJ, Sjaarda LA, et al. Perceived stress, reproductive hormones, and ovulatory function: a prospective cohort study. Epidemiology. 2015;26(2):177-184. doi:10.1097/EDE.0000000000000238
2. Gordon CM, Ackerman KE, Berga SL, et al. Functional hypothalamic amenorrhea: an Endocrine Society clinical practice guideline. J Clin Endocrinol Metab. 2017;102(5):1413-1439. doi:10.1210/jc.2017-00131
3. Schmidt PJ, Nieman LK, Danaceau MA, Adams LF, Rubinow DR. Differential behavioral effects of gonadal steroids in women with and in those without premenstrual syndrome. N Engl J Med. 1998;338(4):209-216.
4. Matsumoto T, et al. Altered autonomic nervous system activity as a potential etiological factor of premenstrual syndrome and premenstrual dysphoric disorder. BioPsychoSoc Med. 2007;1:24. doi:10.1186/1751-0759-1-24
5. Baker FC, Colrain IM, Trinder J. Reduced parasympathetic activity during sleep in the symptomatic phase of severe premenstrual syndrome. J Psychosom Res. 2008;65(1):13-22.
6. Landén M, et al. Heart rate variability in premenstrual dysphoric disorder. Psychoneuroendocrinology. 2004;29(6):733-740. doi:10.1016/S0306-4530(03)00117-3
7. Foster JA, Rinaman L, Cryan JF. Stress & the gut-brain axis: regulation by the microbiome. Neurobiol Stress. 2017;7:124-136. doi:10.1016/j.ynstr.2017.03.001
8. Ma L, Yan Y, Webb RJ, et al. Psychological stress and gut microbiota composition: a systematic review of human studies. Neuropsychobiology. 2023;82(5):247-262. doi:10.1159/000533131
9. Kwa M, Plottel CS, Blaser MJ, Adams S. The intestinal microbiome and estrogen receptor-positive female breast cancer. J Natl Cancer Inst. 2016;108(8):djw029. doi:10.1093/jnci/djw029
10. Lynch CD, Sundaram R, Maisog JM, Sweeney AM, Buck Louis GM. Preconception stress increases the risk of infertility: results from a couple-based prospective cohort study, the LIFE study. Hum Reprod. 2014;29(5):1067-1075. doi:10.1093/humrep/deu032
11. Pascoe MC, Thompson DR, Ski CF. Yoga, mindfulness-based stress reduction and stress-related physiological measures: a meta-analysis. Psychoneuroendocrinology. 2017;86:152-168. doi:10.1016/j.psyneuen.2017.08.008
12. Zaccaro A, et al. How breath-control can change your life: a systematic review on psycho-physiological correlates of slow breathing. Front Hum Neurosci. 2018;12:353. doi:10.3389/fnhum.2018.00353
13. Antonelli M, Barbieri G, Donelli D. Effects of forest bathing (shinrin-yoku) on levels of cortisol as a stress biomarker: a systematic review and meta-analysis. Int J Biometeorol. 2019;63(8):1117-1134. doi:10.1007/s00484-019-01717-x
14. Pal A, Nath B, Paul S, Meena S. Evaluation of the effectiveness of yoga in management of premenstrual syndrome: a systematic review and meta-analysis. J Psychosom Obstet Gynaecol. 2022;43(4):517-525. doi:10.1080/0167482X.2022.2086457
15. Witbracht M, Keim NL, Forester S, Widaman A, Laugero KD. Female breakfast skippers display a disrupted cortisol rhythm and elevated blood pressure. Physiol Behav. 2015;140:215-221. doi:10.1016/j.physbeh.2014.12.044
16. Michels KA, Mendola P, Schliep KC, et al. The influences of sleep duration, chronotype, and nightwork on the ovarian cycle. Chronobiol Int. 2020;37(2):260-271. doi:10.1080/07420528.2019.1694938

---

References