Adrenal Fatigue vs POTS: What Can Actually Be Measured

POTS is a sustained heart rate rise of 30 or more beats per minute within 10 minutes of standing (40 or more in teens), with symptoms and no drop in blood pressure. Our team sees that rise as a compensation for falling brain blood flow.

If your problem is adrenaline surges, a racing heart and high blood pressure when you stand, that's hyperadrenergic POTS, a norepinephrine pattern with its own page. Adrenal fatigue is a different claim, about cortisol and adrenal glands said to be worn out by stress.

Is Adrenal Fatigue a Real Diagnosis?

Some doctors, other health care providers and the general media use the term for a condition said to come from long-term stress, and as of a 2016 review, no endocrinology society recognizes it. A 2016 systematic review in BMC Endocrine Disorders screened 3,470 records and kept 58 studies, 33 in healthy people and 25 in people with symptoms, that used cortisol awakening tests, direct awakening cortisol and salivary rhythm tests. It found no substantiation that adrenal fatigue is an actual medical condition. The authors also named the limits of what they reviewed: designs that varied widely, mostly descriptive studies, weak fatigue measures and cortisol methods endocrinologists don't endorse.

A 2025 opinion piece in the Journal of the Pakistan Medical Association says terms like adrenal fatigue and adrenal burnout "are not a part of the medical or endocrine lexicon." A 2024 paper on pseudo-endocrine disorders in the Journal of the Endocrine Society goes further on testing and treatment. It says adrenal fatigue testing "consists of nonvalidated online surveys and salivary cortisol profiles," and that treatment "is not evidence-based at best and can be dangerous."

The strongest case for keeping some version of the idea comes from a 2026 hypothesis paper in Frontiers in Endocrinology. Its authors propose reframing the adrenal stress index "as a candidate biomarker of inflammatory adaptation" instead of a test of adrenal fatigue. That's a proposal still waiting to be tested, and it leaves the adrenal fatigue label behind.

Can Adrenal Fatigue Cause POTS or Dizziness When Standing?

Our team's view is that it very likely doesn't. Practitioners who use the label usually test a salivary cortisol rhythm, often several saliva samples across a day, and look for a low or off-rhythm pattern. In our team's view, a salivary cortisol rhythm can't tell you why you're dizzy on standing.

Some people with POTS have low aldosterone, which raised the question of adrenal trouble, so a small 2023 study tested the adrenal glands directly. Researchers gave adrenocorticotropic hormone (ACTH) to 8 women with POTS and 5 healthy women, all on a low-sodium diet. ACTH raised cortisol and aldosterone in the women with POTS, and their peak cortisol didn't differ from the healthy group's. With 13 people, all women, the study can't show that adrenal function is normal in everyone with POTS. In the patients it tested, the adrenal glands responded the way they should.

Some people with air hunger and normal oxygen levels are told it comes from their adrenals. Our team's view is that the adrenals take most of their orders from the brain, through the hypothalamus and pituitary, and from the nervous system, with no big sensing role for oxygen or breathing. That makes them an unlikely source of air hunger.

What Is Adrenal Insufficiency, and How Is It Tested?

Adrenal insufficiency is the recognized adrenal diagnosis. When the adrenal glands themselves fail, it's called primary adrenal insufficiency, or Addison's disease. It's treated by replacing the missing hormones, under the same Endocrine Society guideline.

The Endocrine Society's 2016 guideline recommends testing to rule it out in anyone with symptoms or signs that point to it. The short corticotropin test, using 250 μg of ACTH, is its "gold standard" for making the diagnosis. When that test isn't possible first, the guideline recommends measuring morning plasma ACTH and cortisol as a screen.

The guideline names fatigue as a reason to test only alongside other findings. In pregnancy, for example, it recommends testing when unexplained persistent nausea, fatigue and low blood pressure occur together, so tiredness alone doesn't settle anything. If an adrenal problem is suspected, these are the blood tests the Endocrine Society guideline recommends. The salivary profile used for adrenal fatigue hasn't been validated (Journal of the Endocrine Society, 2024).

Where Does Cortisol Actually Fit?

Our team focuses on one of cortisol's main jobs, glucose homeostasis: freeing glucose, helping the liver turn fat and protein into usable energy, and steadying blood sugar against insulin. When you're under strain and need more energy, the demand on that glucose system goes up.

In our team's experience, many people told they have adrenal fatigue turn out to have a blood sugar regulation problem, such as reactive hypoglycemia.

A 2025 opinion piece lists low blood sugar as one possible mediator. It says the label may refer to real adrenal insufficiency, a shift in autonomic tone or fatigue from continuous stress, and that it "may be mediated by hypoglycaemia" or electrolyte problems.

If you're taking an adrenal supplement or steroid, don't stop it suddenly without talking to your prescriber.

Where Does Hyperadrenergic POTS Fit?

In POTS, the word that sounds like adrenal is hyperadrenergic, which describes too much signaling from the sympathetic nerves, not worn-out adrenal glands. How it is identified and treated is covered on our hyperadrenergic POTS page.

The inner part of the adrenal gland releases adrenaline, and a rare adrenal tumor called pheochromocytoma can mimic hyperadrenergic POTS. A plasma metanephrines test rules it out.

So the word gets stretched across 3 different systems: the adrenal cortex making cortisol, the sympathetic nerves releasing norepinephrine, and blood sugar regulation. Each one is checked a different way.

Replay

	Adrenal fatigue	Adrenal insufficiency	Hyperadrenergic POTS
What it is	A proposed condition said to come from stress wearing out the adrenals	Adrenal glands that don't do their job; the primary form is Addison's disease	A POTS subset thought to come from sympathetic (norepinephrine) overactivity
What's measured	Salivary cortisol profiles and online surveys	Short corticotropin (ACTH) test; morning ACTH and cortisol to screen	Standing norepinephrine, the Valsalva blood pressure response and sympathetic nerve activity
Recognized	Not by any endocrinology society	Yes, with an Endocrine Society guideline	Studied as a POTS subset
What endocrinology says about the test	Called nonvalidated in a 2024 Journal of the Endocrine Society paper	The Endocrine Society guideline's recommended "gold standard"	The Valsalva marker comes from one 28-patient study

Sources: a 2016 systematic review (PMID 27557747), a 2024 paper on pseudo-endocrine disorders (PMID 39749108), the Endocrine Society's 2016 guideline (PMID 26760044), Raj, 2013, and Okamoto, 2024 (PMID 39109428).

What Tests Separate Adrenal Problems From POTS?

For the adrenal side, cortisol and ACTH testing, covered above, is how adrenal insufficiency gets ruled in or out. Past that, our team starts with timing. If your symptoms are worse when you're hungry or after you eat, ask for a glucose panel and learn how your blood sugar and insulin behave. In the clinic's view, blood sugar swings can make you lightheaded and shaky and can feel a lot like orthostatic intolerance or a volume problem, so steadying glucose is a good first step. Our POTS diet guide covers where food fits.

If glucose checks out, cross it off and move to hemodynamics, meaning how blood flow and heart rate respond when you stand. A tilt table test tracks heart rate and blood pressure upright, and our team adds brain blood flow to the picture. Hormone panels aren't where our team starts. If fear or panic is part of the question, POTS vs anxiety sorts out the symptoms the 2 share.

Adrenal Fatigue and POTS: FAQ