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            <h1>
              Chronic Stress, Cortisol, and the <span className="it">Hidden Link to Hormonal Disorders</span>
            </h1>

            <PostByline slug="chronic-stress-cortisol-and-the-hidden-link-to-hormonal-disorders" />

            <figure className="figure reveal">
              <img src="/assets/chronic-stress-cortisol-hormonal-disorders-header.png" alt="Person from behind reaching up to touch the back of their neck, suggesting tension and fatigue" />
            </figure>

            <p className="lede-p">
              Modern stress rarely looks like a crisis. It usually looks like answering emails while exhausted,
              carrying the invisible mental load, running on caffeine, sleeping too little, and promising
              yourself you'll finally rest "after this week," a week that never seems to end.
            </p>

            <p>
              Your body, however, doesn't experience stress as an idea, it experiences it as a physiological
              state.
            </p>

            <p>
              At the center of that state is cortisol, the body's main stress hormone. In the short term,
              cortisol is protective and necessary. But when stress becomes chronic, cortisol patterns can
              become dysregulated, and that dysregulation can ripple through the hormonal systems that govern
              your cycle, ovulation, thyroid function, metabolism, and mood (
              Toufexis et al., 2014
              ;{' '}
              Chrousos, 2009
              ;{' '}
              McEwen, 1998
              ). This doesn't mean your body is broken. It often means your body has been operating in survival
              mode for longer than it was designed to.
            </p>

            <h2>What cortisol is (and why you need it)</h2>

            <p>
              Cortisol is produced by the adrenal glands in response to signals from the brain via the
              hypothalamic-pituitary-adrenal (HPA) axis. When your brain perceives stress, it releases
              corticotropin-releasing hormone (CRH), which triggers adrenocorticotropic hormone (ACTH), which
              then stimulates cortisol release (
              Chrousos, 2009
              ).
            </p>

            <p>In healthy rhythms, cortisol:</p>

            <ul>
              <li>helps you wake up and mobilize energy in the morning</li>
              <li>supports blood sugar regulation (especially under demand)</li>
              <li>modulates immune and inflammatory responses</li>
              <li>helps the body respond to short-term threats</li>
            </ul>

            <p>
              The issue isn't cortisol itself, it's what happens when the body is repeatedly pushed into
              "on mode" without enough recovery.
            </p>

            <h2>Acute stress vs. chronic stress: Why the difference matters</h2>

            <p>
              Acute stress is short-lived and can be adaptive. Cortisol rises, helps you cope, and then
              returns to baseline.
            </p>

            <p>Chronic stress is prolonged or repeated activation. Over time, the body may show:</p>

            <ul>
              <li>frequent activation of stress systems</li>
              <li>difficulty "shutting off" the stress response</li>
              <li>compensatory changes across other systems trying to maintain balance</li>
            </ul>

            <p>
              This cumulative "wear and tear" is often described as allostatic load (
              McEwen, 1998
              ;{' '}
              Juster et al., 2010
              ). When allostatic load increases, systems that are not essential for immediate survival, like
              reproduction, may be down-regulated (
              Toufexis et al., 2014
              ).
            </p>

            <h2>How chronic stress can disrupt female hormones</h2>

            <h3>1) Suppress the reproductive axis (and ovulation)</h3>

            <p>
              Reproduction is energetically expensive. Under sustained stress, the brain can reduce signaling
              to the reproductive system (the hypothalamic-pituitary-gonadal axis), affecting pulsatile GnRH
              release, LH/FSH patterns, ovulation, and ovarian steroid production (
              Toufexis et al., 2014
              ;{' '}
              Domes et al., 2024
              ).
            </p>

            <p>This is part of why chronic stress is associated with:</p>

            <ul>
              <li>delayed ovulation or anovulation</li>
              <li>longer or irregular cycles</li>
              <li>luteal phase disruption (sometimes experienced as worsened PMS or spotting)</li>
              <li>
                in more severe cases, functional hypothalamic amenorrhea (FHA); a condition where periods stop
                because the brain suppresses reproductive hormones (
                <a href={AylaRouter.pathFor(rareDisordersRoute)} onClick={(e) => { e.preventDefault(); setRoute(rareDisordersRoute); }}>
                  see our guide to rare hormonal disorders
                </a>
                )
              </li>
            </ul>

            <p>
              Importantly, FHA isn't only about body weight, it's often linked to a combination of stress,
              energy deficit, and/or intense physical demand, and is frequently characterized by
              hypercortisolemia and altered HPA activity (
              Berga et al., 1997
              ;{' '}
              Sanders et al., 2018
              ).
            </p>

            <h3>2) Worsen insulin resistance (a key driver in PCOS)</h3>

            <p>
              Cortisol helps raise blood glucose during stress by increasing glucose production in the liver
              and influencing how tissues respond to insulin. When cortisol exposure is excessive (whether from
              chronic stress or glucocorticoid medications), insulin sensitivity can worsen through multiple
              pathways involving muscle, liver, adipose tissue, and inflammatory signaling (
              Geer et al., 2014
              ;{' '}
              Ferris &amp; Kahn, 2012
              ;{' '}
              Beaupere et al., 2021
              ).
            </p>

            <p>Over time, this matters because insulin resistance can contribute to:</p>

            <ul>
              <li>increased androgen production in the ovaries</li>
              <li>disrupted ovulation</li>
              <li>weight-resistance patterns and central adiposity</li>
              <li>higher cardiometabolic risk</li>
            </ul>

            <p>
              These mechanisms are relevant to PCOS, where insulin resistance and metabolic dysfunction are
              common (though not universal).
            </p>

            <h3>3) Contribute to "adrenal-driven" androgen symptoms</h3>

            <p>
              Stress biology and androgens can intersect in complex ways. The adrenal glands produce androgens
              (like DHEA-S), and some people experience more androgenic symptoms during prolonged stress
              states. In PCOS specifically, several studies and reviews discuss altered HPA-axis features and
              stress-related physiology as part of the broader picture (though PCOS is multifactorial and not
              "caused by stress") (
              Basu et al., 2018
              ;{' '}
              Gonzalez et al., 2022
              ;{' '}
              Blay et al., 2016
              ).
            </p>

            <p>
              A notable example: hair cortisol (a longer-term measure of cortisol exposure assessed from cortisol
              stored in hair over time) has been investigated in PCOS, with findings suggesting higher hair
              cortisol in subsets of PCOS patients and potential links to metabolic features. Stress may not
              be the sole cause, but it can be a meaningful amplifier for symptoms like acne, hair thinning, or
              cycle irregularity in people already vulnerable.
            </p>

            <h3>4) Influence thyroid signaling and thyroid hormone conversion</h3>

            <p>The thyroid system is sensitive to broader physiological stress. Evidence shows glucocorticoids can:</p>

            <ul>
              <li>reduce TSH</li>
              <li>inhibit peripheral conversion of T4 to active T3</li>
              <li>increase conversion toward reverse T3 (rT3)</li>
            </ul>

            <p>
              This pattern resembles aspects of non-thyroidal illness physiology and stress adaptation (
              Fröhlich &amp; Wahl, 2021
              ;{' '}
              Burr et al., 1976
              ).
            </p>

            <p><b>What this can look like in real life:</b></p>

            <ul>
              <li>fatigue and brain fog</li>
              <li>feeling cold or "slowed down"</li>
              <li>hair shedding</li>
              <li>lower exercise tolerance</li>
            </ul>

            <p>
              Sometimes thyroid labs remain "normal," but symptoms persist. That is why context and clinical
              evaluation matter.
            </p>

            <p>
              <b>Note:</b> thyroid symptoms have many causes; chronic stress is one piece, not a standalone
              diagnosis.
            </p>

            <h3>5) Dysregulation is linked to cyclic mood disorders in some women</h3>

            <p>
              Premenstrual mood disorders like PMS/PMDD are not simply "in your head". They involve sensitivity
              to normal hormonal fluctuations, with emerging evidence pointing to altered stress system
              regulation (including HPA-axis responses) in PMDD (
              Hamidovic et al., 2024
              ).
            </p>

            <p>
              Not every person with PMS/PMDD has "high cortisol." Some studies show blunted or altered cortisol
              responses to stress, which can reflect dysregulation rather than a single direction (high vs low).
              This matters because it reframes symptoms as physiology, not weakness.
            </p>

            <h2>A critical myth check: "cortisol steal"</h2>

            <p>
              You may hear claims like "cortisol steals progesterone" (or "pregnenolone steal"). While it's a
              popular narrative, it's not considered a well-supported biochemical mechanism in the way it's
              commonly described.
            </p>

            <p>A more accurate, evidence-based framing is:</p>

            <ul>
              <li>chronic stress can suppress reproductive signaling and ovarian function</li>
              <li>ovulation and luteal function can be disrupted</li>
              <li>progesterone patterns may shift as a downstream effect of altered HPG axis regulation</li>
            </ul>

            <p>
              In other words: progesterone issues under stress are real, the simplistic "steal" story is often
              overstated.
            </p>

            <h2>Signs your stress physiology may be affecting your hormones</h2>

            <p>
              This isn't a diagnosis, it's a pattern-awareness checklist to discuss with a clinician if it
              resonates:
            </p>

            <ul>
              <li>cycles becoming longer, more irregular, or ovulation signs disappearing</li>
              <li>PMS worsening, more spotting, shorter luteal phase symptoms</li>
              <li>fatigue that doesn't improve with rest (especially with anxiety or wired-tired feeling)</li>
              <li>worsening acne/hair shedding during prolonged stressful periods</li>
              <li>blood sugar instability, cravings, or "hangry" crashes</li>
              <li>mood symptoms that reliably intensify premenstrually</li>
            </ul>

            <h2>What actually helps</h2>

            <p>
              Healing stress physiology isn't about adding another task to your to-do list. It's about
              restoring signals of safety and stability in the body.
            </p>

            <p>Evidence-informed, practical foundations include:</p>

            <p><b>1) Stabilize blood sugar</b></p>
            <p>
              Consistent meals with protein/fiber/healthy fats can reduce glucose swings that intensify cortisol
              demand. This is especially relevant if insulin resistance is present.
            </p>

            <p><b>2) Sleep protection (not perfection)</b></p>
            <p>
              Sleep disruption itself is a stressor. Creating predictable wind-down cues and minimizing
              night-time stress activation supports HPA regulation.
            </p>

            <p><b>3) Nervous system regulation practices you'll actually do</b></p>
            <p>
              Breathwork, gentle movement, walking outdoors, stretching, and social connection can reduce stress
              reactivity over time, especially when practiced consistently rather than intensely.
            </p>

            <p><b>4) Training that matches your physiology</b></p>
            <p>
              Overtraining + underfueling is a common path toward cycle disruption and FHA risk in vulnerable
              women.
            </p>

            <p><b>5) Get the right labs (when needed)</b></p>
            <p>
              If cycles shift significantly, symptoms are severe, or you're postpartum, it can be appropriate to
              evaluate thyroid markers, iron, metabolic markers, and reproductive hormones in context, guided by
              a clinician. For a testing roadmap, see our{' '}
              <a href={AylaRouter.pathFor(bloodworkRoute)} onClick={(e) => { e.preventDefault(); setRoute(bloodworkRoute); }}>
                bloodwork guide for women
              </a>.
            </p>

            <h2>The Ayla take</h2>

            <p>
              If your hormones feel chaotic, it may not be because your body is failing. It may be because your
              body is doing exactly what it evolved to do: prioritize survival when it senses threat, even if
              that "threat" is modern life, chronic pressure, and no recovery.
            </p>

            <p>
              At Ayla Wellness, we don't believe in blaming women for biology. We believe in understanding it
              and building a lifestyle that supports it.
            </p>

            <p>
              <a href={AylaRouter.pathFor('waitlist')} onClick={(e) => { e.preventDefault(); setRoute('waitlist'); }}>
                Join Ayla's waitlist
              </a>{' '}
              for cycle-aware support and hormone health insights.
            </p>

            <div className="article-references">
              <h2>References</h2>
              <ol>
                <li>
                  Toufexis D, Rivarola MA, Lara H, Viau V. Stress and the reproductive axis. <em>J Neuroendocrinol.</em> 2014;26(9):573–586. Available from:{' '}
                  <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC4166402/" target="_blank" rel="noopener noreferrer">https://pmc.ncbi.nlm.nih.gov/articles/PMC4166402/</a>
                </li>
                <li>
                  Chrousos GP. Stress and disorders of the stress system. <em>Nat Rev Endocrinol.</em> 2009;5(7):374–381.
                </li>
                <li>
                  McEwen BS. Stress, adaptation, and disease: allostasis and allostatic load. <em>Ann N Y Acad Sci.</em> 1998;840:33–44.
                </li>
                <li>
                  Juster RP, McEwen BS, Lupien SJ. Allostatic load biomarkers of chronic stress and impact on health and cognition. <em>Neurosci Biobehav Rev.</em> 2010;35(1):2–16.
                </li>
                <li>
                  Domes G, et al. Gonads under stress: a systematic review and meta-analysis on the effects of psychosocial stress on gonadal steroids in humans. <em>Psychoneuroendocrinology.</em> 2024.
                </li>
                <li>
                  Berga SL, et al. Women with functional hypothalamic amenorrhea but not other forms of anovulation display increased cortisol secretion. <em>Fertil Steril.</em> 1997.
                </li>
                <li>
                  Sanders KM, et al. Heightened cortisol response to exercise challenge in women with functional hypothalamic amenorrhea. <em>Am J Obstet Gynecol.</em> 2018.
                </li>
                <li>
                  Geer EB, Islam J, Buettner C. Mechanisms of glucocorticoid-induced insulin resistance. <em>Endocrinol Metab Clin North Am.</em> 2014;43(1):75–102. Available from:{' '}
                  <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC3942672/" target="_blank" rel="noopener noreferrer">https://pmc.ncbi.nlm.nih.gov/articles/PMC3942672/</a>
                </li>
                <li>
                  Ferris HA, Kahn CR. New mechanisms of glucocorticoid-induced insulin resistance: make no bones about it. <em>J Clin Invest.</em> 2012;122(11):3854–3857.
                </li>
                <li>
                  Beaupere C, et al. Molecular mechanisms of glucocorticoid-induced insulin resistance. <em>Int J Mol Sci.</em> 2021;22(2):623.
                </li>
                <li>
                  Basu BR, Chowdhury O, Saha SK. Possible link between stress-related factors and altered body composition in polycystic ovary syndrome. <em>J Hum Reprod Sci.</em> 2018. Available from:{' '}
                  <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC5892097/" target="_blank" rel="noopener noreferrer">https://pmc.ncbi.nlm.nih.gov/articles/PMC5892097/</a>
                </li>
                <li>
                  Gonzalez D, et al. Hair cortisol in polycystic ovary syndrome. <em>Sci Rep.</em> 2022;12:xxxx.
                </li>
                <li>
                  Blay SL, Aguiar JV, Passos IC. Polycystic ovary syndrome and mental disorders: a systematic review and exploratory meta-analysis. <em>Neuropsychiatr Dis Treat.</em> 2016.
                </li>
                <li>
                  Fröhlich E, Wahl R. Physiological role and use of thyroid hormone metabolites. <em>Front Endocrinol (Lausanne).</em> 2021;12:587. (Glucocorticoids decrease TSH; inhibit T4→T3; increase rT3).
                </li>
                <li>
                  Burr WA, et al. Effect of a single dose of dexamethasone on serum T3 and reverse T3 in euthyroid subjects. <em>Lancet.</em> 1976.
                </li>
                <li>
                  Hamidovic A, et al. Blunted cortisol response to acute psychosocial stress in women with premenstrual dysphoric disorder during the late luteal phase. [Journal]. 2024. Available from:{' '}
                  <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC10965026/" target="_blank" rel="noopener noreferrer">https://pmc.ncbi.nlm.nih.gov/articles/PMC10965026/</a>
                </li>
              </ol>
            </div>
          </article>

          <aside>stress · cortisol · HPA axis</aside>
        </div>
      </div>

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