What are the symptoms of adrenal insufficiency?

Symptoms of Adrenal Insufficiency

Adrenal insufficiency presents with a constellation of nonspecific symptoms dominated by profound fatigue, gastrointestinal complaints, unintentional weight loss, and orthostatic hypotension, with hyperpigmentation and salt craving being specific markers of primary adrenal insufficiency. 1

Cardinal Symptoms Present in Most Patients

Fatigue and Weakness

• Profound, persistent fatigue occurs in 50-95% of patients and is often the most debilitating symptom 2, 3
• Muscle weakness accompanies the fatigue in many cases 3, 4
• Lethargy and reduced energy levels are hallmark features that distinguish under-replacement from adequate therapy 1

Gastrointestinal Manifestations

• Nausea and vomiting affect 20-62% of patients, frequently accompanied by poor appetite 5, 2
• Morning nausea is particularly prominent and may improve with earlier glucocorticoid dosing 6
• Abdominal pain occurs commonly and can mimic acute surgical conditions 1, 7
• Anorexia and weight loss develop in 43-73% of patients 2, 8

Cardiovascular Signs

• Orthostatic (postural) hypotension is an early cardinal feature that appears before supine hypotension develops 6, 5
• Low blood pressure in both sitting and standing positions reflects mineralocorticoid deficiency 4
• Progressive loss of vasomotor tone occurs due to impaired alpha-adrenergic receptor responsiveness 7

Distinguishing Features of Primary vs. Secondary Adrenal Insufficiency

Specific to Primary Adrenal Insufficiency

• Hyperpigmentation of skin creases, scars, and mucous membranes strongly suggests primary adrenal insufficiency because markedly elevated ACTH stimulates melanocyte receptors 1, 7
• Salt craving is a specific clinical clue for primary adrenal insufficiency due to mineralocorticoid (aldosterone) deficiency 6, 5
• Hyperkalemia occurs in approximately 50% of primary cases, though its absence does not exclude the diagnosis 1, 5

Specific to Secondary Adrenal Insufficiency

• Normal skin coloration (absence of hyperpigmentation) favors secondary adrenal insufficiency, where ACTH production is low or absent 7
• Hyperkalemia is generally absent because aldosterone secretion remains intact 7
• Patients often have other pituitary hormone deficiencies (hypothyroidism, hypogonadism) 1

Laboratory Abnormalities That Accompany Symptoms

Electrolyte Disturbances

• Hyponatremia is present in approximately 90% of newly diagnosed cases and can be indistinguishable from SIADH 1, 5
• The combination of hyponatremia plus hyperkalemia suggests primary adrenal insufficiency, while hyponatremia without hyperkalemia suggests secondary adrenal insufficiency 5
• Mild hypercalcemia occurs in 10-20% of patients 1

Metabolic Abnormalities

• Hypoglycemia may occur, particularly in children, though it is less frequent in adults 7
• Increased creatinine from prerenal renal failure reflects volume depletion 1, 7

Symptoms of Acute Adrenal Crisis (Life-Threatening Emergency)

Severe Acute Manifestations

• Severe hypotension and shock with dehydration are hallmark features requiring immediate recognition 7
• Severe vomiting and/or diarrhea are common precipitating events and presenting symptoms 7
• Altered mental status progresses from malaise to confusion, obtundation, and potentially coma if treatment is delayed 7
• Severe weakness, muscle pain or cramps, and abdominal pain with peritoneal irritation 1, 7

Critical Clinical Pitfall

Treatment of suspected acute adrenal crisis should never be delayed for diagnostic procedures—give hydrocortisone 100 mg IV immediately plus 0.9% saline infusion at 1 L/hour if adrenal crisis is suspected 1, 6, 5

Common Triggers That Unmask or Worsen Symptoms

• Gastrointestinal illness with vomiting/diarrhea is the most common trigger 7
• Any type of infection can precipitate crisis 7
• Physical stress, trauma, or surgical procedures without adequate steroid coverage 7
• Medications that increase cortisol clearance (anticonvulsants, rifampin, barbiturates) can unmask adrenal insufficiency 6, 5
• Starting thyroid hormone replacement before adequate glucocorticoid replacement can trigger crisis in patients with multiple hormone deficiencies 6, 5

Important Diagnostic Caveats

• The absence of hyperkalemia cannot rule out adrenal insufficiency, as it is present in only about 50% of cases 1, 7
• Normal or even elevated plasma cortisol levels do not exclude relative adrenal insufficiency in physiologically stressed patients 7, 5
• Symptoms are often nonspecific and diagnosis is frequently delayed, contributing to presentation with acute crisis 3, 9
• Between 10-20% of patients have mild or moderate hypercalcemia at presentation, and some may have normal electrolytes 1