Adrenal Insufficiency (Addison's Disease): Symptoms, Diagnosis and Treatment

Overview

Adrenal insufficiency occurs when the adrenal glands don't produce adequate amounts of cortisol, and often aldosterone as well — hormones essential for regulating blood pressure, blood sugar, stress response, and electrolyte balance. Primary adrenal insufficiency (Addison's disease) results from direct damage to the adrenal glands, most commonly from an autoimmune process. Secondary adrenal insufficiency results from a problem with the pituitary gland, which normally signals the adrenals to produce cortisol.

Addison's disease is rare, affecting roughly 1 in 100,000 people, and can develop gradually, making early symptoms easy to miss or attribute to other causes. It requires lifelong hormone replacement and careful management, especially during illness, injury, or surgery, when the body's cortisol needs increase significantly ("stress dosing").

Untreated or undertreated adrenal insufficiency can lead to an adrenal crisis — a life-threatening emergency involving severe low blood pressure, shock, and altered consciousness. Patients need to understand this risk and carry emergency information and medication.

Symptoms

Chronic fatigue and weakness
Unintentional weight loss
Low blood pressure, sometimes with dizziness on standing
Darkening of the skin, particularly in creases, scars, and pressure points (a specific feature of primary adrenal insufficiency)
Salt cravings
Nausea, vomiting, or abdominal pain
Low blood sugar
Muscle and joint pain
Irritability or depression
Decreased libido

Adrenal crisis (emergency): severe weakness, confusion, very low blood pressure, severe vomiting/diarrhea, and loss of consciousness — requires immediate emergency treatment.

Diagnosis

Morning cortisol level — low levels raise suspicion; timing matters since cortisol naturally varies through the day
ACTH stimulation test — the definitive test; measures how the adrenal glands respond to a synthetic hormone that should normally trigger cortisol release
ACTH level — helps distinguish primary (high ACTH, adrenal problem) from secondary (low/normal ACTH, pituitary problem) adrenal insufficiency
Antibody testing — 21-hydroxylase antibodies support an autoimmune cause of primary adrenal insufficiency
Imaging — CT of adrenals or MRI of the pituitary, depending on suspected cause
Electrolyte panel — low sodium and high potassium are common in primary adrenal insufficiency due to aldosterone deficiency

Treatments

Glucocorticoid replacement — hydrocortisone, prednisone, or dexamethasone, taken daily to replace missing cortisol
Mineralocorticoid replacement — fludrocortisone, needed in primary adrenal insufficiency to replace aldosterone and maintain sodium/potassium balance
Stress dosing — patients must learn to increase their glucocorticoid dose during illness, injury, significant stress, or before surgery, since the body's needs increase substantially in these situations
Emergency injection kit — injectable hydrocortisone (or similar) for emergencies when oral medication can't be taken or absorbed (severe vomiting, unconsciousness)
Medical alert identification — a bracelet or card indicating adrenal insufficiency, critical for emergency responders to provide appropriate treatment quickly
Regular monitoring — periodic blood tests and clinical assessment to ensure appropriate dosing, which sometimes needs adjustment over time

Medical Resources

Your Care Plan

A step-by-step guide to navigating your condition, from finding the right doctors to advocating for the care you deserve.

Step 1: Doctors to See

Start with: Your primary care physician for initial cortisol testing if adrenal insufficiency is suspected.

Then seek: An endocrinologist for confirmatory testing (ACTH stimulation test) and long-term management — this is essential given the complexity of dosing and the risk of adrenal crisis.

Critical steps everyone should take:

Get a medical alert bracelet or necklace stating "adrenal insufficiency" and steroid-dependent
Obtain and know how to use an emergency injectable hydrocortisone kit
Educate close family members or coworkers on recognizing an adrenal crisis and administering emergency medication if needed

Step 2: Advocate for Yourself

If you have unexplained chronic fatigue, weight loss, low blood pressure, and skin darkening, specifically ask about adrenal insufficiency testing rather than accepting vague explanations. Once diagnosed, insist on thorough education about stress dosing — this is not optional guidance, and inadequate dosing during illness or surgery can precipitate a life-threatening adrenal crisis. Make sure you have an emergency injection kit and know how to use it, and that people close to you know the signs of a crisis and how to help. Wear medical alert identification at all times — in an emergency where you can't communicate, this can be lifesaving.

Step 3: Your Action Plan

See your primary doctor for initial cortisol testing if you have suggestive symptoms.
Get referred to an endocrinologist for ACTH stimulation testing to confirm diagnosis.
Start glucocorticoid (and mineralocorticoid, if primary) replacement therapy as prescribed.
Get thorough education on stress dosing — know exactly how to adjust your medication during illness or before procedures.
Obtain an emergency injectable hydrocortisone kit and learn how to use it.
Get and wear medical alert identification stating your condition.
Educate family members or close contacts on recognizing and responding to an adrenal crisis.
Attend regular follow-up appointments to monitor and adjust your medication over time.

Important: This report is educational information, not medical advice. Always consult a qualified healthcare professional for diagnosis and treatment decisions.