If your body had a “stress manager,” cortisol would be the person with the clipboard. It helps keep your blood pressure steady,
your blood sugar usable, your immune system from going full drama-queen, and your energy from crashing the moment life gets
mildly inconvenient (like a cold, a deadline, or a surprise 6 a.m. flight).
Secondary adrenal insufficiency happens when your adrenal glands could make cortisolbut they aren’t getting the
right signal from the brain to do it. The result can feel like running on 3% battery while everyone around you insists,
“Have you tried… coffee?”
This guide covers what secondary adrenal insufficiency is, how it differs from other forms of adrenal insufficiency,
what symptoms to watch for, how it’s diagnosed, and what treatment and day-to-day management usually look like.
What Is Secondary Adrenal Insufficiency?
Your body’s cortisol system is a chain of command called the HPA axis (hypothalamus → pituitary → adrenal).
In simple terms:
- Hypothalamus starts the conversation.
- Pituitary gland sends the instruction (ACTH).
- Adrenal glands make cortisol in response.
In secondary adrenal insufficiency, the pituitary doesn’t produce enough ACTH
(adrenocorticotropic hormone). Without ACTH, the adrenal glands don’t get the message to make enough cortisol.
Over time, the adrenal glands can shrink from lack of stimulation.
A key detail: in most cases of secondary adrenal insufficiency, aldosterone is preserved because aldosterone is controlled
mainly by the kidneys (via the renin-angiotensin system), not ACTH. That’s one reason secondary adrenal insufficiency
often looks a little different from primary adrenal insufficiency (Addison’s disease).
Secondary vs. Primary Adrenal Insufficiency (Why the Difference Matters)
The symptoms can overlap, but these clues often help clinicians tell the two apart:
- No skin darkening (hyperpigmentation) in most cases: Hyperpigmentation is more typical in primary adrenal insufficiency,
where ACTH is high and can stimulate skin pigment pathways. In secondary, ACTH is low. - Less severe salt/water loss: Because aldosterone is usually normal in secondary adrenal insufficiency, severe dehydration,
high potassium, and intense salt craving are more typical of primary adrenal insufficiency. - More “brain-to-gland” causes: Pituitary problems or medication-related suppression are common in secondary adrenal insufficiency.
Why it matters: treatment plans and what you monitor (especially mineralocorticoid needs) may differ.
And if the pituitary is involved, other hormones (thyroid, sex hormones, growth hormone) might also be affected.
Symptoms of Secondary Adrenal Insufficiency
Symptoms are often nonspecific and can creep in graduallymaking it easy to blame stress, aging, parenting, or
“my body is just being weird.” Common symptoms include:
Common symptoms
- Persistent fatigue (the kind that sleep doesn’t fix)
- Weakness or reduced stamina
- Nausea, decreased appetite, or unintentional weight loss
- Dizziness or lightheadedness, especially when standing (orthostatic symptoms)
- Abdominal discomfort or vague “stomach just feels off” sensations
- Low mood, brain fog, or irritability
Symptoms that can show up during illness or stress
- Feeling disproportionately wiped out by a minor infection
- Low blood pressure symptoms (faintness, shakiness)
- Low blood sugar (especially in children, or adults who go long stretches without eating)
- Vomiting or diarrhea that makes it hard to keep medication down
Red flags for possible adrenal crisis
Even though adrenal crisis is often emphasized with primary adrenal insufficiency, it can also occur with secondary adrenal insufficiency,
particularly during serious illness, surgery, trauma, or if steroid replacement is missed.
Seek emergency care if symptoms include:
- Severe vomiting or diarrhea
- Fainting, severe weakness, or confusion
- Severe abdominal pain or back pain
- Signs of shock (very low blood pressure, clammy skin, extreme drowsiness)
Causes of Secondary Adrenal Insufficiency
Secondary adrenal insufficiency is usually caused by either (1) reduced ACTH production from the pituitary or
(2) suppression of the HPA axis from external steroid medications. Here are the most common categories:
1) Glucocorticoid (steroid) medications and HPA-axis suppression
The most frequent real-world cause is long-term glucocorticoid use. When you take steroids such as prednisone,
methylprednisolone, dexamethasone, or even high-dose inhaled/topical steroids in some cases, your body senses the extra steroid
and turns down ACTH production. If steroids are stopped too quickly, your adrenal glands may not “wake up” fast enough,
and cortisol levels can be dangerously low.
Example: Someone takes prednisone for months for asthma flares, rheumatoid arthritis, lupus, or inflammatory bowel disease.
They taper quickly or stop abruptly after feeling better. Two weeks later they’re hit with crushing fatigue, nausea, dizziness,
and can’t figure out why walking up stairs suddenly feels like a competitive sport.
2) Pituitary tumors or structural pituitary problems
Benign pituitary tumors (adenomas) can interfere with ACTH production by compressing normal pituitary tissue.
Other structural problemslike “empty sella” changescan also affect hormone output.
3) Pituitary surgery or radiation
People treated for pituitary tumors may develop secondary adrenal insufficiency after surgery or radiation therapy.
It can be temporary or permanent, depending on the situation and recovery of pituitary function.
4) Pituitary apoplexy, head injury, or bleeding events
A sudden eventlike bleeding into the pituitary (pituitary apoplexy) or significant traumatic brain injurycan disrupt ACTH production
and lead to cortisol deficiency.
5) Inflammation, infiltration, or autoimmune pituitary conditions
Some inflammatory conditions can affect the pituitary (for example, hypophysitis). Certain cancer immunotherapies (immune checkpoint inhibitors)
can trigger pituitary inflammation and disrupt ACTH production. Infiltrative diseases and infections are less common but possible.
6) Medications that affect the HPA axis
Beyond classic steroids, some medications can suppress ACTH or interfere with cortisol balance (for example, chronic opioid use in some contexts).
This is not a do-it-yourself diagnosismedication history needs clinical interpretation.
How Secondary Adrenal Insufficiency Is Diagnosed
Diagnosis often requires a mix of symptom review, lab tests, and sometimes imaging. Because symptoms are so broad,
clinicians rely on hormone testing to confirm low cortisol production and identify where the signal is breaking down.
Step 1: Morning cortisol (and often ACTH)
Cortisol follows a daily rhythm, with the highest levels typically in the early morning.
A low morning serum cortisol can raise suspicion. Measuring ACTH at the same time can help distinguish
secondary (low/inappropriately normal ACTH) from primary (high ACTH) adrenal insufficiency.
Step 2: ACTH (cosyntropin) stimulation test
The cosyntropin stimulation test is commonly used to assess adrenal reserve. You receive synthetic ACTH and cortisol is measured
before and after. If cortisol doesn’t rise appropriately, adrenal insufficiency is likely.
One nuance: in very recent-onset secondary adrenal insufficiency, the adrenal glands may still respond normally because they haven’t yet “atrophied.”
That’s why clinicians interpret results in context and may use additional dynamic testing if needed.
Step 3: Look for the “why” (pituitary evaluation)
If secondary adrenal insufficiency is suspected, clinicians often check other pituitary hormones and consider imaging (like an MRI of the pituitary),
especially when symptoms suggest broader hypopituitarism (changes in menstrual cycle, low libido, infertility, low thyroid symptoms, or headaches/vision changes).
Step 4: Review medication history carefully
Steroid exposure is sometimes more complicated than “I take prednisone.” Steroids can show up as injections, bursts, creams, inhalers,
or combination products. Your clinician may ask detailed questions about timing, dose, and duration because that influences both diagnosis and taper plans.
Treatment: Replacing Cortisol and Preventing Crisis
Treatment has two big goals:
(1) replace the cortisol your body isn’t making, and (2) teach your body (and your calendar) how to handle stress safely.
Glucocorticoid replacement (daily cortisol support)
Most people are treated with an oral glucocorticoid such as hydrocortisone, prednisone, or sometimes prednisolone.
The “best” choice depends on lifestyle, symptom control, and clinician preference.
- Hydrocortisone is shorter-acting and is often taken in divided doses to mimic natural cortisol rhythm.
Many people feel best with a larger dose in the morning and a smaller dose later in the day. - Prednisone/prednisolone are longer-acting and may be dosed once daily or split, depending on the plan.
The art of treatment is avoiding both undertreatment (fatigue, nausea, low blood pressure symptoms)
and overtreatment (weight gain, mood changes, insomnia, high blood sugar, bone loss over time).
This is why follow-up mattersdose adjustments are common.
Do you need fludrocortisone?
Usually no in secondary adrenal insufficiency, because aldosterone is typically preserved.
(Fludrocortisone is more commonly needed in primary adrenal insufficiency.)
Stress dosing (because life doesn’t schedule emergencies politely)
When you’re sick, injured, or undergoing surgery, your body normally increases cortisol production.
If you have secondary adrenal insufficiency, you may need to temporarily increase your glucocorticoid dose (“stress dose”)
to prevent an adrenal crisis. Your clinician should provide personalized “sick day” instructions.
As a general concept:
- Mild illness (low-grade fever, minor cold): you may need a short-term increase.
- Moderate illness (high fever, flu-like symptoms): you may need a larger increase and closer monitoring.
- Vomiting/diarrhea (can’t keep pills down): this is an emergency-risk situationinjectable steroids may be needed.
- Surgery/major dental work: stress dosing is often planned in advance.
Emergency preparedness
Many clinicians recommend:
- Wearing a medical ID that notes adrenal insufficiency and steroid dependence
- Carrying an emergency steroid injection kit if prescribed
- Keeping a printed or phone-accessible emergency plan for urgent care/ER staff
Treat the underlying cause (when possible)
If secondary adrenal insufficiency is caused by a pituitary disorder, treatment may include surgery, medication, radiation, or observation,
depending on the diagnosis. If it’s caused by steroid therapy, the focus is often on a safe taper and monitoring recovery of the HPA axis.
Important sequencing when multiple pituitary hormones are low
If someone has both low cortisol and low thyroid hormone from pituitary issues, clinicians typically address
cortisol replacement first. Starting thyroid hormone without adequate cortisol can increase metabolic demand and
worsen cortisol deficiencysomething clinicians specifically try to avoid.
Living With Secondary Adrenal Insufficiency
Once treatment is established, many people do wellbut daily life usually improves fastest when you pair medication with
practical routines.
Track patterns (without turning your life into a spreadsheet)
A simple symptom log can help you and your clinician fine-tune dosing:
energy level, dizziness, nausea, sleep quality, and what time you take medication.
The goal is to find the “just right” doseenough to function, not so much that side effects creep in.
Plan for travel and busy days
- Carry extra medication in your bag (not checked luggage).
- Bring a written plan for stress dosing and emergencies.
- Set alarmsbecause missed doses happen to the best of us.
Don’t stop steroids suddenly
If your adrenal insufficiency is related to steroid use, tapering should be guided by a clinician.
“I felt fine so I stopped” is a very human ideaand also one your HPA axis may strongly disagree with.
When to Get Help Right Away
Contact urgent care or emergency services if you suspect an adrenal crisisespecially with severe vomiting/diarrhea,
fainting, confusion, or severe weakness. Adrenal crisis is treatable, but it’s not a “wait and see” situation.
If you have diagnosed secondary adrenal insufficiency, ask your clinician for clear instructions on:
when to increase oral dosing, when to use an injection (if prescribed), and when to go to the ER.
Conclusion
Secondary adrenal insufficiency is a cortisol deficiency problem caused by reduced ACTH signaling from the pituitaryoften due to long-term steroid use
or pituitary disease. The symptoms can be vague, but the stakes are real: untreated low cortisol can make everyday illness feel overwhelming
and, in severe cases, can lead to adrenal crisis.
The good news is that with accurate diagnosis, appropriate glucocorticoid replacement, and a solid stress-dosing plan,
most people can return to a stable routine. Think of treatment as giving your body the cortisol “backup generator” it needs
until the system recoversor for the long haul if it doesn’t.
Experiences: What People Often Describe (And What Helps)
The hardest part about secondary adrenal insufficiency is that it can feel invisibleuntil it isn’t. People often describe a long stretch of
“I’m not sick exactly, but I’m definitely not okay.” One common story starts after months of steroid treatment for a legitimate reason:
asthma flares, autoimmune disease, a stubborn skin condition, a back injury that turned into repeated injections. The steroids work (sometimes
brilliantly), and life resumes. Then the taper endssometimes too quickly, sometimes at a perfectly reasonable paceand suddenly the body feels like
it forgot how to handle normal life.
Many people say the fatigue isn’t like ordinary tiredness. It’s more like your muscles are negotiating every task:
“We can do the laundry, but we will require a nap treaty afterward.” Others describe morning grogginess that doesn’t lift, nausea that comes and goes,
or a dizzy “head rush” when standing that makes them grip the counter like it’s a trusted friend. Because these symptoms overlap with stress, depression,
anemia, thyroid issues, and a dozen other things, people often spend months bouncing between explanationssometimes even convincing themselves they’re just
being dramatic. (They’re not.)
For people whose secondary adrenal insufficiency is related to pituitary disease, the experience can be different but equally confusing.
Some recall headaches, vision changes, or new problems with libido or menstrual cycles before anyone connects the dots. After pituitary surgery,
the recovery may include a phase where everything feels “off” and energy is unpredictable. People often describe relief when they finally have a name
for what’s happeningbecause once the cause is identified, there’s a plan.
The most helpful coping strategies people report are surprisingly practical. First: a routine. Taking medication at consistent times, setting alarms,
and carrying an extra dose in a wallet or bag reduces anxiety and prevents missed doses. Second: an illness plan that isn’t vague.
People feel safer when they have a clear instruction sheet for what to do with fever, stomach bugs, or surgeryand when family members know where it is.
Third: learning personal early-warning signs. Some people notice subtle cluesmore dizziness than usual, nausea that doesn’t match what they ate, or
a weird “I can’t handle minor stress today” feelingbefore a bigger crash. Recognizing those cues and contacting a clinician early can prevent a spiral.
Finally, there’s the emotional side: living with a condition that requires “extra steps” can be frustrating. People often describe feeling embarrassed
about requesting accommodations (“I promise I’m not high-maintenance, my cortisol is just on strike”). What helps is reframing:
this isn’t being dramaticit’s being prepared. Wearing a medical ID, keeping emergency information handy, and asking about stress dosing isn’t overkill.
It’s the adult version of bringing an umbrella when the forecast says “maybe rain.” You might not need it every day, but on the day you do,
you’ll be very glad it’s there.
