Spokes 5 and 6: HPA Axis Dysregulation and the Immune Consequences of Chronic Threat

Spoke 5: The Endocrine Spoke — HPA Dysregulation, Steroidogenesis, and the Cortisol Cascade

The endocrine spoke is not a separate problem from the autonomic dysregulation described in the spokes that precede it. It is the same problem expressed through the hormonal system the autonomic nervous system governs. The HPA axis is the endocrine arm of the threat response, and in chronic dysautonomia it gets locked into threat mode and stops returning to baseline. This spoke covers more ground than the others, because the HPA axis touches nearly every other hormonal system in the body. What follows is not a complete account of endocrine dysfunction in dysautonomia. It is the throughline that connects cortisol to the systems each subsection addresses.

The mechanism is sequential and predictable. Perceived threat activates the hypothalamus, which signals the pituitary, which drives adrenal cortisol production. In a normally developed nervous system this cascade fires, resolves, and returns to baseline. In chronic dysautonomia the cascade fires and does not resolve because the safety signal that would restore baseline never arrives (Porges, 2011). The HPA axis is not malfunctioning. It is functioning exactly as the threat state requires. The pathology is not in the axis. It is in the set-point.

The Cortisol Cascade and What It Costs

Cortisol is not a pathological molecule. It is the body’s primary endurance hormone, designed to sustain the organism through prolonged threat when the initial adrenaline surge has been exhausted.

In chronic dysautonomia, cortisol production becomes chronic, remaining calibrated for sustained threat across decades of a life in which the original threat is no longer present but the nervous system has no mechanism to register its absence (McEwen, 2007; Heim et al., 2008).

The downstream costs of chronic cortisol elevation are systemic. Cortisol suppresses neuroplasticity (Andreadi et al., 2025). It reinforces the autonomic dysfunction described in the preceding spokes, further suppressing vagal motor output and amplifying the endocrine consequences of chronic threat (Porges, 2011). It methylates oxytocin into an inert form, which is the biochemical mechanism by which chronic threat dismantles the capacity for social connection and trust. In the limbic system, this oxytocin methylation is not a psychological consequence of trauma. It is a direct molecular consequence of cortisol load, and it operates independently of whether the patient is conscious of being in a threat state.

The defining endocrine consequence of chronic cortisol elevation is its effect on steroidogenesis. Cholesterol is the raw material of the entire steroid hormone cascade. Pregnenolone is synthesized from cholesterol and is the precursor to every subsequent steroid hormone the body produces, including cortisol, DHEA, testosterone, estrogen, progesterone, and aldosterone. When the body is running a sustained cortisol production program, the clinical pattern that results is consistent and recognizable: cortisol stays high while DHEA, sex hormones, and aldosterone trend low. The older “pregnenolone steal” language tried to explain this with a single shared hormone pool. The mechanism is still being worked out, and the explanation may run through several pathways rather than one. What is not in question, clinically, is the pattern itself. Across years and decades it produces a hormonal landscape in which cortisol is chronically elevated and everything downstream of the pregnenolone branch point that leads away from cortisol is chronically depleted.

The clinical expression of that depletion is what fills these patients’ charts. Low DHEA. Testosterone deficiency in both men and women. Estrogen dysregulation across the menstrual cycle and into perimenopause. Aldosterone insufficiency producing the low blood pressure, salt craving, and orthostatic intolerance that are characteristic of this pattern. Progesterone deficiency producing the anxiety, sleep disruption, and cycle irregularity that are routinely treated as psychiatric problems rather than as endocrine consequences of a nervous system running on a chronic survival program (Kalantaridou et al., 2004; Schüle et al., 2014).

The Neurosteroid Layer

Below the classical steroid hormones, in a layer of endocrine function that most clinical protocols do not address, the same prioritization pattern depletes the neurosteroids. Pregnenolone itself, before it is converted to anything else, functions as a neurosteroid with direct effects on brain function, memory consolidation, and autonomic balance (Zorumski et al., 2019). Allopregnanolone, a downstream metabolite of progesterone, is the endogenous modulator of GABA-A receptors and is one of the body’s primary built-in anxiety regulators (Zorumski et al., 2019). When the steroidogenic cascade is running toward cortisol, both pregnenolone and allopregnanolone are chronically reduced. The nervous system is running without its own endogenous calming substrate. The anxiety, the hypervigilance, the inability to downregulate that patients with this pattern experience is not only a learned response pattern. It has a biochemical floor in the depletion of the neurosteroids that would otherwise be modulating it.

The Circadian Layer

The cortisol dysregulation in chronic dysautonomia does not only produce hormonal depletion. It dismantles the circadian architecture that governs the timing of every hormonal cycle in the body. Cortisol and melatonin sit at opposite ends of the circadian axis, peaking at opposite times, and their relationship is inverse and precisely timed. When cortisol is chronically elevated, including at times when it should be low, it suppresses melatonin secretion and delays its onset (Andreadi et al., 2025; Moffitt, 2025).

This disruption is not confined to the trauma population. Screens introduce an independent driver of melatonin suppression through blue light exposure in the evening hours, a mechanism that operates regardless of cortisol status and is now nearly universal (West et al., 2011). Most people in modern life are already running a melatonin deficit before chronic cortisol elevation enters the picture at all. In chronic dysautonomia, the two mechanisms compound: a baseline circadian disruption that is already common, layered with a cortisol-driven suppression that is specific to the threat state.

Patients frequently arrive already taking melatonin, assuming the supplement corrects this deficit. In most cases it does not. Oral melatonin is poorly absorbed and degraded by first pass metabolism before it reaches meaningful circulation, so standard capsules and gummies often amount to a wasted purchase. Liposomal and intranasal formulations bypass this barrier and can meaningfully restore the pathways described here, but the correction is not immediate. Restoring a circadian rhythm suppressed for years takes time, and the supplement form matters as much as the decision to supplement at all (Moffitt, 2025).

The consequences of that compounded deficit extend beyond poor sleep. Chronic cortisol elevation compresses slow wave sleep, the stage during which cortisol normally reaches its lowest point and the bulk of nightly cellular repair occurs (Späth-Schwalbe et al., 1991; Born et al., 1989). Melatonin also governs nighttime insulin suppression, preserving blood glucose for the brain during sleep (Peschke & Mühlbauer, 2010). Without sufficient melatonin, liver glycolysis accelerates, blood glucose drops prematurely, and the liver releases adrenaline to compensate, the mechanism behind the early morning waking many patients describe not as insomnia but as being unable to stay asleep past three or four in the morning.

In some patients the disruption is not only hormonal but learned. Survivors of repeated nighttime threat were conditioned to treat sleep itself as the dangerous state, and the nervous system that learned nighttime meant harm has no reason to release its vigilance once the original threat is gone.

The melatonin deficit also feeds back into the mitochondrial layer described in Spoke 7. Melatonin supports mitochondrial function directly through its antioxidant role at the inner mitochondrial membrane (Lei et al., 2024), so a system depleted of melatonin is a system whose nightly mitochondrial repair cycle is not completing, compounding the bioenergetic depletion Spoke 7 describes.

The Localized Expression

The cortisol dysregulation in chronic dysautonomia does not always present as a systemic pattern that standard endocrine testing captures. Serum cortisol drawn at a single morning timepoint may be within normal reference range in patients whose circadian cortisol rhythm is profoundly disrupted, whose nighttime cortisol suppression is inadequate, and whose local tissue cortisol availability is highly uneven (Chapman et al., 2013). The adrenal dysfunction article in this series describes the clinical phenomenon of localized cortisol deserts, specific fascial zones in which impaired local circulation and altered 11β-HSD1 enzyme activity produce areas of cortisol insufficiency that coexist with systemic cortisol excess (Chapman et al., 2013). These zones correspond to the retained primitive reflex patterns and the sinew channel territories described in Spoke 2 (Schleip, 2003; Langevin, 2006). The tissue in these zones heals poorly, densifies, hyperpigments in some presentations, and shows the alternating high-tone and low-tone fascial patterns that reflect local autonomic dysregulation rather than systemic adrenal failure (Flomenbaum & Warner, 2022). This is why a normal morning cortisol does not rule out the endocrine spoke in these patients.

The question is whether the cortisol rhythm is appropriately timed, whether melatonin is being adequately produced at night, whether the steroidogenic cascade is allocating toward survival hormones at the expense of the rest of the hormonal architecture, and whether the neurosteroid layer that sits below the classical hormones is depleted. These questions require a different assessment framework than the standard endocrine panel provides.

The endocrine spoke resolves in the same direction as every other spoke: through the hub. Restoring autonomic regulation is the precondition for restoring the HPA set-point. The set-point will not normalize while the nervous system receives a continuous threat signal. When the threat signal diminishes through the work described in the treatment section of this series, the HPA axis recalibrates, the steroidogenic prioritization shifts away from cortisol, the circadian architecture begins to restore, and the hormonal landscape downstream of pregnenolone gradually reorganizes (van der Kolk, 2014). The endocrine work follows the autonomic work. Attempting to correct the hormonal picture without addressing the autonomic driver produces temporary shifts that revert because the signal driving the original allocation has not changed. Developmental Trauma Disorder represents the most severe and longest standing expression of this pattern, because the threat was never outside the body. It was the foundation the nervous system was built on.

The metabolic consequences of this endocrine pattern extend into insulin signaling, a topic already introduced in the enteric spoke. Chronic cortisol elevation, sympathetic dominance, and circadian disruption all impair insulin sensitivity and contribute to the metabolic burden carried by these patients (Broussard et al., 2012). The resulting insulin resistance represents another downstream expression of the same autonomic state rather than a separate disease process. The spokes are interconnected and interdependent. A change in one inevitably affects the others because they are all responding to the same underlying regulatory system.

Clinical Pearl: In TCM, dysautonomia is fundamentally a disorder of the Heart-Kidney, or fire-water, axis. Because this axis regulates all five yin viscera, autonomic dysfunction produces pathology across all of them. A reductionist Zang Fu approach may provide symptomatic relief, but it cannot resolve a disorder whose origin lies in the fire-water axis itself.