Clinical Manifestations of Adrenal Insufficiency in Adults
Adrenal insufficiency presents with nonspecific chronic symptoms including fatigue (50-95%), weight loss, postural dizziness, anorexia, nausea/vomiting (20-62%), and abdominal discomfort, with hyperpigmentation being the only specific sign in primary adrenal insufficiency. 1
Chronic Presentation: Symptoms and Signs
The clinical picture of adrenal insufficiency is characterized by insidious, nonspecific manifestations that frequently lead to delayed diagnosis 1, 2:
Common Symptoms
- Fatigue and weakness - Present in 50-95% of patients, often the most prominent complaint 2
- Weight loss - Occurs in 43-73% of cases, typically unintentional 2
- Gastrointestinal symptoms - Anorexia, nausea, vomiting (20-62%), and abdominal discomfort 1
- Postural dizziness - Related to orthostatic hypotension 1
- Salt craving - Specific to primary adrenal insufficiency due to mineralocorticoid deficiency 3
Physical Signs
- Hyperpigmentation - The only specific sign, occurring exclusively in primary adrenal insufficiency due to elevated ACTH levels. Appears in sun-exposed areas, skin creases, mucosal membranes, scars, and areola of the breast. Must be compared with the patient's baseline pigmentation and that of siblings 1
- Hypotension with increased postural drop - Low blood pressure is characteristic 1
Laboratory Abnormalities
- Hyponatremia - Often the trigger that prompts diagnostic workup 1
- Hyperkalemia - Develops later in the disease course, specific to primary adrenal insufficiency 1
- Hypoglycemia and hypercalcemia - Uncommon but can occur 1
Acute Presentation: Adrenal Crisis
Adrenal crisis is a medical emergency characterized by severe weakness, hypotension/shock, marked abdominal symptoms, altered consciousness, and severe electrolyte abnormalities requiring immediate treatment. 1, 4
Crisis Symptoms
- Severe weakness and syncope
- Abdominal pain, nausea, vomiting (may mimic an acute abdomen)
- Back pain
- Confusion, reduced consciousness, delirium, lethargy, somnolence, collapse, coma, or seizures 1, 4
- Fever 4
Crisis Signs
- Hypotension or hypovolemic shock - Typically resistant to inotropes and fluid resuscitation if not treated with glucocorticoids 4
- Abdominal tenderness/guarding 1
- Shock out of proportion to the severity of the trigger 4
Crisis Laboratory Findings
- Hyponatremia
- Hyperkalemia
- Hypoglycemia
- Hypercalcemia 1
Important Clinical Distinctions
Primary vs. Secondary Adrenal Insufficiency:
- Primary (Addison's disease) - Includes hyperpigmentation, hyperkalemia, and salt craving due to combined glucocorticoid and mineralocorticoid deficiency with elevated ACTH 1
- Secondary - Lacks hyperpigmentation and hyperkalemia; no impact on the renin-angiotensin-aldosterone system 1
Critical Clinical Pitfalls
The nonspecific nature of symptoms leads to diagnostic delays, which inversely correlates with long-term quality of life 1. Hyponatremia and hyperkalemia are often the laboratory triggers that finally prompt diagnosis 1. The condition must be distinguished from secondary adrenal insufficiency, as treatment differs—primary requires both glucocorticoid and mineralocorticoid replacement 1.
Additional manifestations may arise from the underlying cause, including associated autoimmune disorders (up to 50% develop another autoimmune condition), neurological features of adrenoleukodystrophy, or disorders causing adrenal infiltration 1, 3.
Glucocorticoid-induced adrenal insufficiency can present during or after tapering of supraphysiological glucocorticoid doses and represents a common but underrecognized form 2, 5.