Addison's Disease: Causes, Symptoms and Treatment
Addison's disease is a rare disorder of the adrenal cortex in which insufficient amounts of the vital hormones cortisol and aldosterone are produced. This chronic adrenal insufficiency requires lifelong hormone replacement therapy.
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Addison's disease is a rare disorder of the adrenal cortex in which insufficient amounts of the vital hormones cortisol and aldosterone are produced. This chronic adrenal insufficiency requires lifelong hormone replacement therapy.
What is Addison's Disease?
Addison's disease, also known as primary adrenal insufficiency, is a rare, chronic condition in which the adrenal cortex does not produce enough steroid hormones. The hormones most affected are cortisol (a stress hormone essential for many bodily functions) and aldosterone (a hormone that regulates salt and water balance). The disease was named after the British physician Thomas Addison, who first described it in 1855. It affects men and women equally and can occur at any age.
Causes
In most cases, an autoimmune reaction is responsible for Addison's disease. The immune system mistakenly attacks and destroys the cells of the adrenal cortex. Other possible causes include:
- Tuberculosis: A common cause in regions with high prevalence.
- Other infections: Such as HIV, fungal infections (histoplasmosis, cryptococcosis).
- Metastases: Cancer spreading to the adrenal glands.
- Adrenal hemorrhage or infarction.
- Genetic disorders: Such as adrenoleukodystrophy or congenital adrenal hypoplasia.
- Certain medications: Such as ketoconazole or etomidate, which inhibit hormone production.
Symptoms
The symptoms of Addison's disease typically develop gradually over months or years. Common signs and symptoms include:
- Chronic fatigue and weakness
- Weight loss and decreased appetite
- Muscle weakness
- Low blood pressure (hypotension), especially upon standing (orthostatic hypotension)
- Hyperpigmentation: Darkening of the skin, especially on skin creases, scars, mucous membranes, and pressure points
- Nausea, vomiting, and abdominal pain
- Salt cravings
- Depression and irritability
- Low blood sugar (hypoglycemia)
Addisonian Crisis
A life-threatening situation called an Addisonian crisis (acute adrenal insufficiency) can occur when the body is under severe stress, during infections, surgery, or if hormone replacement medication is suddenly stopped. Symptoms include a severe drop in blood pressure, extreme vomiting, loss of consciousness, and circulatory failure. An Addisonian crisis is a medical emergency requiring immediate intensive care treatment.
Diagnosis
Diagnosis of Addison's disease is based on a combination of clinical evaluation and laboratory tests:
- Blood tests: Measurement of cortisol and ACTH levels (morning cortisol is typically low).
- ACTH stimulation test: The gold standard diagnostic test. Synthetic ACTH is injected; in Addison's disease, cortisol levels fail to rise adequately.
- Electrolytes: Typically low sodium (hyponatremia) and high potassium (hyperkalemia).
- Autoantibodies: Detection of antibodies against the enzyme 21-hydroxylase in the autoimmune form.
- Imaging: CT or MRI of the adrenal glands to identify the underlying cause.
Treatment
Addison's disease cannot be cured, but it is very manageable. Treatment consists of lifelong hormone replacement therapy:
- Hydrocortisone: Replaces cortisol, typically taken 2-3 times daily to mimic the natural daily rhythm (higher dose in the morning).
- Fludrocortisone: Replaces aldosterone, taken once daily.
Dose Adjustment During Stress
An important part of management is the so-called sick-day rule: During physical stress such as fever, infection, or surgery, the hydrocortisone dose must be temporarily increased on medical advice to prevent an Addisonian crisis. Patients should always carry a medical alert card and an emergency hydrocortisone injection kit.
Quality of Life
With proper treatment and patient education, individuals with Addison's disease can lead a normal life. Regular follow-up appointments with an endocrinologist are recommended.
References
- Bornstein SR et al. - Diagnosis and Treatment of Primary Adrenal Insufficiency: An Endocrine Society Clinical Practice Guideline. Journal of Clinical Endocrinology and Metabolism, 2016.
- Arlt W, Allolio B - Adrenal insufficiency. The Lancet, 2003; 361(9372): 1881-1893.
- World Health Organization (WHO) - Endocrine Diseases: Adrenal Insufficiency. Available at: www.who.int
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Related search terms: Addison's Disease + Addisons Disease + Addison Disease + Addison Syndrome