Myths About Cortisol and Stress Hormones, Checked Against the Guidance
Cortisol and Stress Hormones: what people commonly get wrong, set against what published UK guidance says.
Cortisol is heavily marketed as an explanation for tiredness, while genuine adrenal disease is rare, specific and testable.
Key takeaways
- "Adrenal fatigue": not a recognised medical diagnosis
- Addison's disease: rare, causing fatigue, weight loss, low blood pressure and skin darkening
- Most useful single change: Ask for proper testing rather than accepting "adrenal fatigue".
- Commonest mistake: Buying adrenal support supplements.
- See a doctor if any of the signs under "When to speak to a doctor" below apply to you.
What the guidance actually says
Here is what guidance actually publishes. The rest of the page is measured against it.
| Measure | Figure |
|---|---|
| "Adrenal fatigue" | not a recognised medical diagnosis |
| Addison's disease | rare, causing fatigue, weight loss, low blood pressure and skin darkening |
| Cushing's syndrome | rare, causing central weight gain, thin skin, easy bruising |
| Commonest cause of raised cortisol effects | prescribed steroid medication |
| Steroid card | essential for anyone on long-term steroids |
Where people go wrong
Each of these is common, and each is a mistake in the sense that the guidance says otherwise.
- Buying adrenal support supplements
- Stopping long-term steroids abruptly, which can be fatal
- Accepting an unrecognised diagnosis in place of investigation
What to do instead
- Ask for proper testing rather than accepting "adrenal fatigue"
- Carry a steroid card if you take long-term steroids
- Increase steroid dose during illness only as your clinician has instructed
- Consider thyroid disease, anaemia and sleep apnoea, which are far more common
The part that is genuinely uncertain
Guidance changes, and it changes because evidence does. The figures above reflect current UK guidance from the bodies named at the foot of this page; where those bodies revise their position, theirs is the account to follow rather than this one.
Where to go next
- Cortisol and Stress Hormones: What the Evidence Actually Says
- Why Cortisol and Stress Hormones Matters, Explained Simply
- Cortisol and Stress Hormones — the reference entry
- Vitamin D and Hormones: What the Evidence Actually Says
- The Evidence on Hormonal Contraception and Health, Without the Hype
When to speak to a doctor
Never stop long-term steroid medication suddenly. Call 999 for severe weakness, vomiting, abdominal pain, confusion or collapse in anyone taking or recently stopping steroids — adrenal crisis is life-threatening and needs immediate hydrocortisone. Carry a steroid emergency card.
Where this comes from
- NICE — Addison's disease clinical knowledge summary
- Society for Endocrinology — steroid emergency card
How this page was put together
Every figure, recommendation and warning above is taken from the guidance named in Where this comes from. Nothing on this page is inferred, summarised or generalised beyond what those bodies publish: where they give a number, it is their number, and where they are silent, so are we. Pages are rebuilt whenever the underlying record changes. Sign-off by a named clinician, where it has happened, is shown at the top of the page along with the date.
Medical disclaimer
This article is general information, not medical advice. It cannot account for your own history, medication or circumstances. Always speak to a GP, pharmacist or another qualified health professional before making changes that affect your treatment, and never delay seeking medical advice because of something you have read here. In an emergency, call 999.
Spotted something wrong? Report an error on this page. We correct on the page and say what changed.
