If you have Addison’s disease (or take long-term steroids) and develop severe weakness, vomiting or diarrhea, low blood pressure, confusion, or severe pain in the abdomen, lower back, or legs, this may be an adrenal crisis. Give your prescriber-supplied emergency hydrocortisone injection if you have one and are able, then call 911 or go to the nearest emergency room immediately. Adrenal crisis can be fatal within hours without emergency injectable hydrocortisone and IV fluids. Never stop or skip your steroid medicine, even if you feel well.
The adrenal glands are quiet endocrine workhorses — small organs sitting on top of the kidneys, producing cortisol, aldosterone, and androgens that regulate blood pressure, glucose, electrolytes, and the body’s stress response. Addison’s disease is what happens when these glands fail. Cortisol falls. Aldosterone falls. Sodium leaks out, potassium climbs, blood pressure drops. The result, if untreated, is a slow slide toward weakness, weight loss, hyperpigmentation, and eventually adrenal crisis — a true endocrine emergency.
Addison’s is uncommon: roughly 110 to 144 cases per million people in developed countries, though exact figures vary by study and region. According to the NIDDK, most cases in the United States are autoimmune, with the rest split among infection (tuberculosis remains a major cause globally, along with HIV and fungal infections), bilateral adrenal hemorrhage, infiltrative disease, certain genetic conditions, and surgical removal of the adrenal glands. This guide covers what the disease is, how it is diagnosed, and the lifelong, prescriber-directed replacement therapy and sick-day planning that prevent the crises that can still be fatal. It is educational only and is not a substitute for care from a qualified clinician.
What Addison’s Disease Is
Addison’s, also called primary adrenal insufficiency, is destruction of the adrenal cortex with loss of cortisol, aldosterone, and adrenal androgens. It is worth distinguishing from related problems. Secondary adrenal insufficiency — the pituitary gland failing to make ACTH — produces a similar cortisol deficit but usually spares aldosterone, so the clinical picture differs. Tertiary adrenal insufficiency most often follows long-term use of prescription steroid (glucocorticoid) medicines that suppress the hypothalamic-pituitary-adrenal axis; as MedlinePlus and NIDDK both stress, this is one reason steroid medicines should never be stopped suddenly on your own.
Most US cases are autoimmune, often with antibodies to the enzyme 21-hydroxylase. Addison’s frequently overlaps with other autoimmune diseases: type 1 diabetes, Hashimoto’s thyroiditis, celiac disease, vitiligo, premature ovarian insufficiency, and pernicious anemia. Two distinct autoimmune polyendocrine syndromes (APS-1 and APS-2) include Addison’s as a defining feature. For broader context, see our medical conditions guide.
Symptoms: Subtle Until Crisis
The early picture is vague: fatigue, muscle weakness, unintended weight loss, poor appetite, low blood pressure, salt craving, dizziness on standing, and mild gastrointestinal complaints such as nausea, abdominal pain, or diarrhea. Symptoms develop gradually over months to years and are easily mistaken for depression, chronic fatigue, or generic GI disease. A large share of the adrenal cortex is typically destroyed before symptoms become obvious — by then, hormonal reserves are largely exhausted. As MedlinePlus notes, symptoms “may not be present all the time,” which is part of why the diagnosis is so often delayed.
The hallmark physical sign is hyperpigmentation — a darkening of the skin — particularly on sun-exposed areas, scars, palmar creases, the gums, and the inside of the cheeks and lips. It results from elevated ACTH (driven up as the pituitary tries to stimulate the failing adrenals), which has melanocyte-stimulating activity. Postural (standing) low blood pressure, low sodium, high potassium, low blood sugar, and mild metabolic acidosis commonly show up on basic labs.
Adrenal Crisis: A Medical Emergency
Adrenal crisis (also called Addisonian crisis) is acute, dangerous decompensation of cortisol deficiency. It is frequently triggered by infection — especially a vomiting or diarrheal illness — but also by injury, surgery, severe emotional or physical stress, or missed medication doses. Warning signs include severe weakness, very low blood pressure, vomiting, diarrhea, abdominal pain, pain in the lower back or legs, high fever, dehydration, confusion or reduced consciousness, and ultimately shock. Roughly 6 to 8 percent of people with Addison’s experience an adrenal crisis in a given year, and a small percentage of crises are fatal even with treatment — which is why speed matters.
Adrenal crisis is a life-threatening emergency that requires immediate injectable hydrocortisone and intravenous fluids. If you or someone you care for has Addison’s, use the prescriber-supplied emergency hydrocortisone injection kit if one is available and you are trained and able to give it, and then call 911 or get to an emergency room without delay — do not wait to see whether symptoms pass. Do not try to “ride it out” with extra pills if vomiting is present, because oral medicine may not be absorbed. Everyone with Addison’s should carry a medical-alert bracelet or card and an emergency injection kit, and family members or caregivers should be shown in advance how and when to give the injection.
Diagnosis
The cornerstone test is the ACTH (cosyntropin) stimulation test. Baseline cortisol is drawn, synthetic ACTH is given, and cortisol is measured again shortly afterward; a blunted cortisol response is consistent with adrenal insufficiency. ACTH levels are typically high in primary disease (Addison’s) and low or normal in secondary or tertiary disease, which helps localize the problem. A very low morning cortisol strongly suggests insufficiency, while a clearly normal morning cortisol makes it much less likely.
Once primary disease is confirmed, 21-hydroxylase antibodies help identify an autoimmune cause. Plasma renin and aldosterone confirm mineralocorticoid deficiency. Adrenal imaging (CT) may show small, atrophic glands in autoimmune disease or larger glands in infiltrative, infectious, or hemorrhagic causes. In line with Endocrine Society guidance, clinicians also screen for associated autoimmune conditions — thyroid function, celiac antibodies, and vitamin B12 are common additions. Interpreting these tests is a job for a clinician; the exact thresholds and follow-up depend on your individual situation.
Lifelong Hormone Replacement
Treatment replaces the hormones the adrenal glands can no longer make, and it is lifelong. As NIDDK and MedlinePlus describe, this means a glucocorticoid to replace cortisol — most often hydrocortisone, taken in divided doses through the day to loosely mimic the body’s natural cortisol rhythm, though some people use a longer-acting glucocorticoid such as prednisone or dexamethasone for once-daily convenience. Most people also need a mineralocorticoid (fludrocortisone) to replace aldosterone, along with liberal (not restricted) salt intake. Some clinicians consider DHEA replacement for a subset of patients, particularly for mood and energy, though the evidence is mixed.
All doses are set, and adjusted, only by the prescribing clinician. The right amount is individualized and fine-tuned over time using blood pressure, symptoms, body weight, and lab values such as sodium, potassium, and renin. This guide deliberately does not list specific milligram amounts, because self-dosing or copying a schedule from the internet is dangerous: too little glucocorticoid risks crisis, and chronically too much carries its own long-term harms. If a dose feels wrong, call your prescriber — do not adjust it yourself, and above all never stop the medicine abruptly, which can precipitate a crisis within a day or two.
Sick-Day Rules and Stress Dosing
Cortisol production normally surges during physical stress; in Addison’s, that surge has to be supplied manually. Standard “sick-day rules” involve temporarily increasing the glucocorticoid dose during fever, infection, vomiting, injury, or other significant stress, and giving extra coverage around surgery or major illness. Exactly how much to increase, and for how long, is prescriber-directed: your endocrinologist should give you a written, personalized sick-day plan, because the right adjustment depends on your usual regimen and the situation.
The one rule that is universal: if vomiting or diarrhea prevents you from keeping oral medicine down, oral dosing can no longer be relied on. That is when the prescriber-supplied emergency injection and a trip to the emergency room come in. Every person with Addison’s should have, and keep current, an emergency hydrocortisone injection kit, a medical-alert ID, and a written sick-day protocol — and should make sure at least one family member or friend knows the plan. The Cleveland Clinic and the Endocrine Society publish patient sick-day guidance you can review with your own clinician.
Living With Addison’s
With appropriate, consistent replacement and good crisis prevention, life expectancy can approach normal, and day-to-day management is far less burdensome than it was even a decade ago. A small number of people with brittle disease that cannot be stabilized on tablets use a continuous subcutaneous hydrocortisone infusion (the “cortisol pump”), but this remains a specialist option managed by an endocrinologist.
Pregnancy is generally well tolerated with clinician-guided dose adjustments, particularly in later pregnancy and around labor and delivery, and should always be co-managed with an endocrinologist and obstetrician. Ongoing care usually includes periodic labs (such as sodium, potassium, glucose, thyroid function, and B12) and attention to long-term glucocorticoid-related risks like bone health. Because Addison’s is a chronic condition that needs specialist oversight, it also helps to plan for the cost of ongoing care and medicines — see our healthcare costs guide for options if coverage is a concern.
When to See a Doctor
Persistent unexplained fatigue with weight loss, low blood pressure, salt craving, or darkening skin warrants medical evaluation. Anyone with another autoimmune disease who develops vague, ongoing systemic symptoms should ask their clinician specifically about adrenal insufficiency, since the overlap is common and the early signs are easy to attribute to something else. Screening starts with simple blood tests, and an endocrinology referral follows any abnormal result. Getting the diagnosis made — rather than living with unexplained symptoms for years — is the single most important step.
Frequently Asked Questions
Is Addison’s disease the same as “adrenal fatigue”?
No. Addison’s is a real, measurable disease with cortisol deficiency, elevated ACTH, electrolyte abnormalities, and characteristic exam findings. “Adrenal fatigue” is not a recognized medical diagnosis and lacks reproducible diagnostic criteria. Real adrenal insufficiency requires real testing — not symptom checklists or unvalidated saliva panels sold online.
Can Addison’s disease be inherited?
The common autoimmune form is not directly inherited, but a susceptibility to autoimmune disease can run in families. Two rare genetic syndromes — APS-1 (from AIRE gene mutations, inherited in an autosomal recessive pattern) and APS-2 (polygenic, with variable inheritance) — feature Addison’s prominently.
What triggers an adrenal crisis?
Common triggers include infection (especially gastroenteritis with vomiting), surgery, serious injury, missed or stopped medication, and major physical or emotional stress. Because daily replacement is a fixed amount, the body can fall short quickly when demand suddenly rises — which is exactly what sick-day rules and the emergency injection kit are designed to prevent.
Can I exercise with Addison’s disease?
Usually yes. Many people exercise normally once their replacement is stable, though some need adjustments around vigorous or prolonged activity. Because any change to dosing should be prescriber-directed, coordinate an exercise plan — especially for endurance or high-intensity training — with your endocrinologist rather than adjusting doses yourself.
What should I always carry?
A medical-alert bracelet, necklace, or card that states you have adrenal insufficiency and are steroid-dependent, plus your prescriber-supplied emergency hydrocortisone injection kit and a copy of your written sick-day plan. Make sure someone close to you knows where these are and how to use the injection.
The Bottom Line
Addison’s disease is rare but very manageable when it is properly diagnosed and treated. The danger lies in delay — vague fatigue and weight loss get attributed to other things for years before someone measures cortisol or runs an ACTH stimulation test — and in crisis, which can be prevented. Once diagnosed, the keys are consistent prescriber-set replacement, a personalized sick-day plan, an emergency injection kit, a medical-alert ID, and an endocrinologist who knows you. With those in place, Addison’s becomes a manageable chronic condition rather than a recurring emergency.
This article is general education, not medical advice, and is not a substitute for care from a qualified clinician. Addison’s disease requires lifelong, individualized treatment supervised by a doctor. Do not start, stop, or change any medicine on your own, and do not use any dose you read online. Replacement and sick-day dosing must be set by your prescriber. Adrenal crisis is a medical emergency — use your prescribed emergency injection if available and call 911 or go to the nearest emergency room.