Steroid pills can quiet your own cortisol, which is why stopping suddenly is risky

Key takeaways

• John F. Kennedy was diagnosed with Addison’s disease, a failure to make enough cortisol, around age 30; his doctor denied it during the 1960 campaign, and it wasn’t made public until 1976.
• Cortisol surges in the 30 to 45 minutes after you wake, and in a 2014 analysis of healthy people, most of the variation in that morning rise came from day-to-day swings, so one random test says little.
• A 2024 joint guideline tells clinicians to expect a risk of adrenal suppression after about 3 to 4 weeks of daily steroid pills above roughly 4 to 6 milligrams of prednisone; inhalers, creams and joint shots can add to it.
• About 1 in 12 people with adrenal insufficiency will have a life-threatening adrenal crisis in a given year, a 2016 guideline estimated, which is why it calls for an emergency card, medical ID and an injection kit.
• Endocrinologists asked about the viral “cortisol cocktail” in 2025 knew of no studies showing its ingredients lower cortisol.

In 1960, as John F. Kennedy ran for president, his doctor answered questions about his health with a carefully worded statement. Kennedy, it said, “does not now nor has he ever had an ailment described classically as Addison’s disease”¹.

He had been diagnosed with it around age 30¹². In Addison’s disease, the adrenal glands don’t make enough cortisol³. His symptoms were blamed on malaria from his World War II service², and the diagnosis wasn’t public until a 1976 book¹.

Lee Mandel, a physician and historian of presidential medicine who reviewed Kennedy’s records for a 2009 article in the Annals of Internal Medicine, noted that autoimmune disease causes nearly 80% of Addison’s cases and tuberculosis only about 10%. He argued that the narrow wording of the statement deflected further questions¹. Kennedy also had an underactive thyroid, and the two together likely point to an autoimmune syndrome that attacks several glands, though the journal’s editors said antibody tests would be needed to confirm it¹³. He lived on long-term steroid replacement¹.

His story shows both sides of cortisol. Too little can be deadly. With replacement, a man whose adrenal glands were failing won the presidency at 43³.

Many more people meet cortisol as a medicine, through steroid pills, inhalers and creams. About 1% of all people are on glucocorticoids, the cortisol-like steroids, at any given time, one author of a 2024 guideline estimated⁴. Below, we cover how the hormone works, how it’s really tested, and how to use steroid medicines safely. Our article on the stress response covers cortisol’s emergency role and “cortisol face.”

Cortisol runs on a clock, and one test catches one moment

Cortisol doesn’t hold steady. It jumps in the 30 to 45 minutes after you wake up, a surge researchers call the cortisol awakening response⁵. Late in the day, cortisol release settles into a quiet stretch⁶.

Treatment mirrors that rhythm. The Endocrine Society’s 2016 guideline gives hydrocortisone, the medicine that replaces cortisol, in two or three daily doses, with the largest on waking⁷.

That clock makes single readings slippery. In 2014, researchers tracked cortisol patterns in 324 healthy children, teens and adults across three studies⁸. In the two studies that measured the morning rise, 78% to 89% of its variation came from day-to-day swings rather than stable differences between people⁸.

The authors concluded that these measures mostly reflect the day rather than the person⁸. Even the timing of a sample matters. An expert panel’s 2016 guidelines stress that saliva sampling for the morning rise must start the moment you wake⁵.

So a kit that measures a single morning’s saliva is chasing a moving target. Real cortisol testing is timed and built to answer one specific question.

If you value the body’s built-in wisdom, this rhythm is good news. The system adjusts itself through the day without help. When it truly breaks, standard treatment follows its schedule rather than fighting it.

Too little cortisol: how doctors find it

The Endocrine Society’s 2016 guideline on primary adrenal insufficiency, the medical name for Addison’s-type disease, lays out the tests⁷. It was funded only by the society, with no corporate money⁷.

• Who gets tested. Acutely ill people with unexplained low blood pressure, dehydration, low sodium, high potassium, fever, belly pain or darkened skin, and children with low blood sugar⁷.
• The main test. A shot of synthetic ACTH, the pituitary hormone that tells the adrenals to work. If cortisol peaks below about 18 micrograms per deciliter 30 or 60 minutes later, the adrenals are failing, though cutoffs depend on the lab’s method⁷.
• When that isn’t possible. A morning cortisol level, judged against a cutoff of about 5 micrograms per deciliter and read alongside ACTH, serves as a first look until the full test can be done⁷.
• Finding the source. An ACTH level at least twice the upper limit points to the adrenal glands themselves⁷.

One rule overrides the others. If adrenal crisis is suspected, treatment with hydrocortisone shouldn’t wait for test results⁷.

Too much cortisol: start by checking the medicine cabinet

The Endocrine Society’s 2008 guideline on Cushing’s syndrome, the disease of long-term cortisol excess, opens with a step that’s easy to skip: first rule out steroid medicines⁹.

After that, it advises testing only people with several signs that are getting worse, especially signs that point strongly to the disease, or people with an adrenal growth found by chance on a scan⁹. Doctors start with one accurate test and confirm abnormal results with a second. When results agree and are normal, testing stops⁹. Our stress-response article lists the signs and the three main tests.

This is a twist. The 2024 steroid guideline says that when someone who takes or recently took steroid medicine shows signs of Cushing’s, clinicians should assume that person’s own adrenals are suppressed¹⁰. The body can show the effects of too much steroid while making too little cortisol of its own.

Steroid medicines save lives, and they can put your adrenals to sleep

Prednisone, dexamethasone and related drugs act like cortisol, so the brain senses plenty and stops signaling the adrenals. Over time, the glands go quiet, which doctors call suppression of the stress-hormone system⁴¹⁰.

In 2024, the European Society of Endocrinology and the Endocrine Society issued their first joint guideline on this problem¹⁰. It tells clinicians to expect a risk of adrenal insufficiency when someone takes steroid pills for about 3 to 4 weeks or longer at more than a hydrocortisone dose of 15 to 25 milligrams a day¹⁰. That’s about 4 to 6 milligrams of prednisone¹⁰.

Pills aren’t the only route. The guideline tells clinicians to consider adrenal problems in people using high-dose inhaled or skin steroids, using them for more than a year, combining several forms, or having had a joint injection within two months¹⁰. Certain drugs that slow steroid breakdown raise the risk, too¹⁰.

That’s why stopping suddenly is risky. If your own adrenals are still idle, you can be left without enough cortisol, and illness or vomiting can tip you into crisis¹⁰¹¹. Coming off can also bring withdrawal symptoms that overlap with true adrenal insufficiency⁴¹⁰.

The guideline leaves the plan to the prescriber, who may slow the taper or check a morning cortisol level before stopping¹⁰. Short courses of under 3 to 4 weeks are a different situation, and your prescriber will tell you which applies to you¹⁰.

The evidence behind all this is thinner than you might expect. Felix Beuschlein, who co-chaired the guideline committee, said the panel was “quite astonished at how bad the evidence is”⁴. Most of it was rated low or very low quality⁴.

Adrenal crisis is rare on any one day and common over a year

For people with adrenal insufficiency, crisis isn’t a remote risk. Studies in the 2016 guideline found 6.6 to 8.3 crises per 100 patient-years, which the authors summed up as about 1 in 12 patients each year⁷. Deaths from crisis ran 0.5 per 100 patient-years⁷. By our math, that’s about 1 death for every 200 patients each year.

Ireland’s national health service lists warning signs that call for an ambulance¹¹:

• severe dehydration
• pale, cold, clammy skin, or sweating
• rapid, shallow breathing
• dizziness or severe muscle weakness
• headache
• severe drowsiness or passing out
• severe vomiting and diarrhea

In the U.S., MedlinePlus, the National Library of Medicine’s health site, says anyone with symptoms of adrenal crisis should call 911 or go to an emergency room¹². Among the causes it lists is suddenly stopping a steroid medicine after taking it for a long time¹².

The 2016 guideline says every patient should carry a steroid emergency card and medical ID, keep an injection kit and be trained to use it⁷. Many people keep a hydrocortisone syringe at home that a family member can inject into a muscle, MedlinePlus notes¹². Ireland’s guidance adds a step: call the doctor right after giving the shot¹¹.

Cortisol facts vs. feeds

Our own scorecard, built from the sources cited, for cortisol claims you may see online.

Claim you may see	What tests and trials show	Rating
“A cortisol cocktail lowers your cortisol”	Endocrinologists asked in 2025 knew of no studies of its ingredients on cortisol; it may help hydration15	Not enough evidence
“One random saliva or blood test shows your cortisol is off”	Morning cortisol swings day to day; diagnosis uses timed tests built for one question5789	Evidence says no, or unsafe
“Most people need to lower their cortisol”	Doctors rarely try outside Cushing’s or severe highs, and too little cortisol is dangerous15	Not enough evidence
“Short sleep raises cortisol”	Evening cortisol rose after one short night, but another small trial found a slower, blunted response instead613	Promising but early
“Mindfulness lowers cortisol”	Five small trials in healthy adults showed a modest drop14	Promising but early
“Steroid inhalers and creams can’t affect your adrenals”	High doses or more than a year of use can10	Evidence says no, or unsafe
“You can spot high cortisol from a round face or belly”	Doctors rule out steroid medicines first and test only when several signs are worsening9	Not enough evidence

What moves cortisol: sleep, mindfulness and a drink with no studies

Sleep. In a 1997 study, young men’s evening cortisol was 37% higher after a night of four hours’ sleep and 45% higher after a sleepless night, compared with the day before⁶. The nightly quiet stretch also started at least an hour late⁶. Those are relative changes from a lab study of young men.

The picture is more complex than “short sleep equals high cortisol.” In a 2017 trial of 11 healthy young men, two nights of about four hours’ sleep didn’t significantly change daytime cortisol¹³. Instead, the adrenals responded more weakly to a test dose of a stress-signal hormone and recovered more slowly¹³. U.S. National Institutes of Health grants, the European Sleep Research Society and French sleep researchers funded it¹³. Either way, steady sleep supports a steady rhythm.

Mindfulness. A 2016 review in Frontiers in Physiology pooled five randomized trials with 190 healthy adults. Mindfulness programs lowered saliva cortisol by what the authors called a moderately low amount, with bigger effects from more sessions¹⁴. The authors said more rigorous trials are needed¹⁴. Spain’s public health research institute funded it¹⁴.

The cortisol cocktail. The viral drink mixes coconut water, orange juice, lemon, magnesium powder, a pinch of sea salt and sparkling water¹⁵. Marilyn Tan, a Stanford endocrinologist, told CNBC in 2025 that she knew of no studies on how those ingredients affect cortisol¹⁵. Jessica Lee of the University of Maryland School of Medicine said doctors almost never try to lower cortisol, partly because it’s hard to track¹⁵.

The drink may help with hydration, Tan said¹⁵. People with chronic kidney disease should be cautious because of its magnesium and potassium, and the sugar matters for people with diabetes¹⁵. Enjoy it as a drink, not as a hormone treatment.

Our ashwagandha article reviews that herb’s cortisol trials and who paid for them. Claims about “cortisol belly” are best weighed against our belly-fat article, which covers what shrinks deep belly fat. “Adrenal fatigue” gets its own look in our article on hormone-balancing claims.

When to get help

Call 911 if someone shows the crisis warning signs above, especially anyone who has adrenal insufficiency or takes, or recently stopped, steroid medicine¹⁰¹¹¹². If an emergency shot has been prescribed, use it as you were trained⁷¹¹.

Call your clinician soon if you feel unwell while coming off a steroid, since withdrawal and adrenal insufficiency can look alike¹⁰. Tell any surgical team about current or recent steroid use, because procedures may call for extra coverage¹⁰.

Don’t start, stop or adjust a steroid on your own. Changes belong to your prescriber¹⁰.

Questions readers ask

The bottom line

Cortisol is not a villain. It follows a daily clock, it keeps you alive, and when the adrenal glands fail, careful replacement can keep a person going, as it did for Kennedy.

The real hazards are specific. Long steroid courses can quiet your own adrenals, and stopping them suddenly can be dangerous. Adrenal crisis needs an emergency shot and 911. Single cortisol tests and viral drinks can’t tell you much, while steady sleep and calm practices may nudge the rhythm in a good direction.

Related reading

• The stress response saves you in minutes, and viral cortisol fixes misread it
• Real hormone problems have names and tests, which “balance your hormones” claims lack
• Ashwagandha lowers a stress hormone, and regulators are now splitting root from leaf
• Exercise can reach the belly fat that matters, and liposuction can’t
• A slightly high thyroid number often needs watching, not a pill

Sources

1. CBC News. “John F. Kennedy’s medical secrets linger.” November 2013 (news report on the 2009 Annals of Internal Medicine article, cited for events only). cbc.ca
2. American Medical News (American Medical Association). Report on Lee R. Mandel’s article on John F. Kennedy’s health history, Annals of Internal Medicine, September 1, 2009. Posted September 11, 2009. amednews.com
3. American College of Physicians. News release on the Annals of Internal Medicine article about John F. Kennedy’s health (published September 1, 2009). EurekAlert!, posted November 20, 2013. eurekalert.org
4. Russell P. “Collaboration Tackles Steroid-Induced Adrenal Insufficiency.” The Hospitalist (MDedge), May 2024 (trade press, cited for quotes and events). blogs.the-hospitalist.org
5. Stalder T, Kirschbaum C, Kudielka BM, et al. “Assessment of the cortisol awakening response: Expert consensus guidelines.” Psychoneuroendocrinology, 2016;63:414-432 (University of Regensburg repository record). pubmed.ncbi.nlm.nih.gov
6. Leproult R, Copinschi G, Buxton O, Van Cauter E. “Sleep loss results in an elevation of cortisol levels the next evening.” Sleep, 1997;20(10):865-870 (Penn State record). pure.psu.edu
7. Bornstein SR, Allolio B, Arlt W, et al. “Diagnosis and Treatment of Primary Adrenal Insufficiency: An Endocrine Society Clinical Practice Guideline.” Journal of Clinical Endocrinology & Metabolism, 2016 (University of Würzburg repository copy). opus.bibliothek.uni-wuerzburg.de
8. Ross KM, Murphy MLM, Adam EK, Chen E, Miller GE. “How stable are diurnal cortisol activity indices in healthy individuals? Evidence from three multi-wave studies.” Psychoneuroendocrinology, 2014;39:184-193. foundationsofhealth.org
9. Nieman LK, Biller BMK, Findling JW, et al. “The diagnosis of Cushing’s syndrome: an Endocrine Society clinical practice guideline.” Journal of Clinical Endocrinology & Metabolism, 2008;93(5):1526-1540 (University of Birmingham record). research.birmingham.ac.uk
10. Endocrine Society. “Glucocorticoid-Induced Adrenal Insufficiency” (Beuschlein F, Else T, Bancos I, et al., European Society of Endocrinology and Endocrine Society joint clinical guideline, Journal of Clinical Endocrinology & Metabolism, 2024). Updated May 13, 2024. endocrine.org
11. Health Service Executive (Ireland). “Addison’s disease: Treatment.” Last reviewed March 22, 2021. www2.hse.ie
12. MedlinePlus. “Acute adrenal crisis.” Medical Encyclopedia, National Library of Medicine, reviewed April 24, 2025. medlineplus.gov
13. Guyon A, Morselli LL, Balbo ML, et al. “Effects of Insufficient Sleep on Pituitary-Adrenocortical Response to CRH Stimulation in Healthy Men.” Sleep, 2017;40(6):zsx064. pubmed.ncbi.nlm.nih.gov
14. “Effects of mindfulness-based interventions on salivary cortisol in healthy adults: A meta-analytical review.” Frontiers in Physiology, 2016;7:471 (University of Zaragoza repository record). zaguan.unizar.es
15. Onque R. “The ‘cortisol cocktail’ has gone viral on TikTok, but can it actually reduce stress? Here’s what doctors say.” CNBC (via NBC New York), July 5, 2025 (news report). nbcnewyork.com