Adrenal Gland Disorders
Adrenal gland disorders are conditions affecting the paired suprarenal glands, whose outer cortex secretes steroid hormones (cortisol, aldosterone, and adrenal androgens) and whose inner medulla secretes catecholamines. Disorders arise when these glands produce too little hormone (insufficiency), too much hormone (hypercortisolism, hyperaldosteronism, catecholamine excess), or develop tumours, and they sit at the crossroads of the hypothalamic-pituitary-adrenal axis, the renin-angiotensin-aldosterone system, and the sympathetic nervous system.
Definition
Adrenal gland disorders are pathological states of the adrenal cortex or medulla characterised by deficient or excessive secretion of adrenal hormones, or by neoplasia of adrenal tissue.
Scope
This area orients the reader across adrenal cortical physiology and steroidogenesis, the deficiency syndromes (primary adrenal insufficiency), the excess syndromes (Cushing's syndrome from cortisol excess), adrenal masses and incidentalomas, and catecholamine-secreting tumours (pheochromocytoma and paraganglioma). It frames each as a reference topic within endocrinology rather than as clinical management guidance.
Sub-topics
Core questions
- Is the adrenal problem one of hormone deficiency, hormone excess, or a structural mass?
- When a hormonal abnormality is present, is its origin in the adrenal gland itself (primary) or in upstream pituitary or hypothalamic signalling (secondary)?
- Does an incidentally discovered adrenal mass secrete hormone, and what is the likelihood it is malignant?
Key concepts
- Adrenal cortex versus adrenal medulla
- Hypothalamic-pituitary-adrenal (HPA) axis
- Renin-angiotensin-aldosterone system
- Steroidogenesis
- Primary versus secondary endocrine dysfunction
- Functioning versus non-functioning adrenal mass
Mechanisms
The adrenal cortex synthesises steroid hormones from cholesterol along three functional zones: the zona glomerulosa makes aldosterone under renin-angiotensin control, the zona fasciculata makes cortisol under pituitary ACTH control, and the zona reticularis makes adrenal androgens. The medulla, derived from neural crest, synthesises catecholamines. Disorders follow from disruption of these pathways: autoimmune or other destruction of the cortex produces deficiency, while autonomous secretion by tumours or ACTH-driven hyperplasia produces excess. Cortisol secretion is governed by negative feedback through the HPA axis, which underlies both the clinical features of cortisol excess and the dynamic tests used to characterise these disorders.
Clinical relevance
Adrenal disorders illustrate how a single gland can fail in opposite directions and how feedback physiology informs the interpretation of laboratory testing. Recognising them matters because cortisol deficiency can be life-threatening and because some adrenal tumours secrete hormones with systemic consequences. This entry describes the conceptual landscape and is not a substitute for individualised diagnosis or treatment.
Epidemiology
The individual conditions vary widely in frequency: primary adrenal insufficiency and pheochromocytoma are uncommon, whereas adrenal incidentalomas are found in a few percent of abdominal imaging studies and become more common with age. Detailed epidemiology is presented in the respective topic entries.
Evidence & guidelines
Several professional bodies have issued clinical practice guidelines spanning this area, including Endocrine Society and European Society of Endocrinology statements on adrenal insufficiency, Cushing's syndrome, adrenal incidentalomas, and pheochromocytoma. These documents define current diagnostic frameworks and are cited within the individual topics.
History
Thomas Addison's 1855 description of the consequences of adrenal destruction established the adrenal gland as essential to life, and Harvey Cushing's early-twentieth-century work linked a characteristic syndrome to pituitary and adrenal pathology. The subsequent isolation of cortisol and aldosterone and the elucidation of the HPA axis turned adrenal medicine into a model of feedback endocrinology.
Related topics
Seminal works
- charmandari-2014
- lacroix-2015
- miller-2011
Frequently asked questions
- What is the difference between the adrenal cortex and the adrenal medulla?
- The outer cortex makes steroid hormones (cortisol, aldosterone, and androgens) from cholesterol, while the inner medulla, derived from neural crest tissue, makes catecholamines such as adrenaline. Disorders of each part produce distinct syndromes.
- Why are adrenal disorders grouped together?
- They share a single organ and overlapping diagnostic logic: clinicians distinguish hormone deficiency from excess, primary (adrenal) from secondary (pituitary or hypothalamic) origin, and functioning from non-functioning masses, using the feedback physiology of the HPA and renin-angiotensin systems.