High Cortisol Symptoms: Doctors Look for Purple Stretch Marks Over a Centimetre Wide. Not Tiredness.

There is a list of high cortisol symptoms doing the rounds. Tiredness. Belly fat. Poor sleep. Irritability. Cravings.

Here is the list an endocrinologist actually screens on. Read it and notice what is missing.

Purple stretch marks over a centimetre wide. Bruising from nothing. Weakness getting out of a chair. [1]

Not tiredness.

How rare is the real thing

Endogenous Cushing syndrome — the body making too much cortisol on its own — is described in a 2026 endocrinology review as, plainly, “a rare disorder”. [2]

How rare depends on who counted. A Danish series measured 1.2 to 1.7 cases per million people per year for the pituitary form. More recent US estimates came out far higher, at 39.5 to 48.6 per million. [1]

We are not going to pretend those agree, because they do not — they differ by a factor of about thirty, which tells you how hard this condition is to count. But take the highest figure and you are still describing something that happens to roughly one person in twenty thousand in a year, in a country where a great many more than that are buying cortisol supplements.

The symptoms cannot tell you. That is by design

Here is the sentence that should end the symptom-list genre: “The history and physical examination findings are often insufficient for diagnosing hypercortisolism, and diagnostic laboratory tests are typically required for accurate diagnosis.” [1]

And the reason is stated just as plainly. The clinical presentation is “often nonspecific”, so screening is deliberately built for high sensitivity and lower specificity — designed to catch everyone who might have it, at the cost of flagging many who do not. [1]

A test built to over-flag is a reasonable thing for a doctor to run on somebody with purple striae. It is a terrible thing to run on yourself using a list of feelings.

The 2026 review makes the same point from the other side: Cushing syndrome is “likely underdiagnosed because many clinical signs and symptoms are non-specific and overlap with those of common conditions.” [2] Rare, and missed — because it looks like ordinary life until it does not.

Your cortisol may genuinely be raised, and it still is not this

This is the part the supplement adverts are half-right about, and it is worth being fair.

Cortisol really does go up in ordinary circumstances. The reference lists them: “transient or physiologic states such as severe stress, depression, alcoholism, and poorly controlled diabetes mellitus.” [1]

So somebody can have measurably high cortisol and no disease at all. The reference draws the line explicitly: “While all patients with Cushing syndrome have hypercortisolism, not all patients with hypercortisolism meet diagnostic criteria for Cushing syndrome.” [1]

Which means a raised reading is not a diagnosis. It is a question. And if it is being driven by a period of severe stress or by drinking, the answer is not a capsule aimed at the number.

And the test is harder than a home kit implies

Cortisol is not a level. It is a rhythm — high in the morning, falling across the day.

The review is blunt about what that does to measurement: traditional monitoring relies on “single-time-point measurements or a cumulation of measurements, which are unable to capture the complete daily rhythm of cortisol fluctuations.” [2] And diagnostic testing “can be complex and challenging, especially in milder cases.”

That is written about hospital endocrinology. It is not a criticism of you for finding it confusing; it is a description of a genuinely difficult measurement being sold as a simple one.

The commonest cause is being given it

One last thing, and it echoes what we found writing about cortisol detoxes from the opposite direction.

The most common source of too much cortisol is not a tumour and not stress. It is glucocorticoid medication — steroids, prescribed for something else. [1]

If you are on steroids and something has changed, that is a real mechanism with a real name, and it belongs in front of the doctor who prescribed them. Not a reason to stop taking anything on your own.

The verdict

Unsupported, for the idea that the circulating symptom lists identify high cortisol. They cannot. The reference says the history and examination are often insufficient even in a clinic, and the features that do prompt testing are physical, specific and measurable — a centimetre of purple striae, not a difficult month.

None of which means feeling exhausted is imaginary. It means the cause of it is genuinely unknown to you from the outside, and picking the one explanation that has a product attached is the worst available way to narrow it down.

If anything on that clinical list describes you — particularly the striae, the easy bruising, or high blood pressure and diabetes arriving early — that is worth a GP appointment, not a supplement. And if none of it does, the tiredness is still real and still worth investigating. Just not here, and not with a capsule.

Journalism, not medical advice. We read the clinical references so we could tell you what is in them. A doctor can examine you, which we cannot.

Related: cortisol detox · how to lower cortisol · cortisol face · ashwagandha benefits · every claim we’ve checked