Addison's Disease


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Definition

Addison's disease is a disorder that occurs when the adrenal glands do not produce enough of their hormones.


Alternative Names

Adrenocortical hypofunction; Chronic adrenocortical insufficiency; Primary adrenal insufficiency


Causes, incidence, and risk factors

The adrenal glands are small hormone-releasing organs located on top of each kidney. They are made up of the outer portion (called the cortex) and the inner portion (called the medulla).

The cortex produces three types of hormones:

  • The glucocorticoid hormones (such as cortisol) maintain sugar (glucose) control, decrease (suppress) immune response, and help the body respond to stress.
  • The mineralocorticoid hormones (such as aldosterone) regulate sodium and potassium balance.
  • The sex hormones, androgens (male) and estrogens (female), affect sexual development and sex drive.

Addison's disease results from damage to the adrenal cortex. The damage causes the cortex to produce less of its hormones.

This damage may be caused by the following:

  • The immune system mistakenly attacking the gland (autoimmune disease)
  • Infections such as tuberculosis, HIV, or fungal infections
  • Hemorrhage, blood loss
  • Tumors
  • Use of blood-thinning drugs (anticoagulants)

Risk factors for the autoimmune type of Addison's disease include other autoimmune diseases:

Certain genetic defects may cause these conditions.


References

Stewart PM, Krone NP. The adrenal cortex. In: Kronenberg H, Melmed S, Polonsky K, Larsen PR, eds. Williams Textbook of Endocrinology. 12th ed. Philadelphia, PA: Saunders Elsevier; 2011:chap 15.


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Review Date: 12/11/2011
Reviewed By: Nancy J. Rennert, MD, Chief of Endocrinology & Diabetes, Norwalk Hospital, Associate Clinical Professor of Medicine, Yale University School of Medicine, New Haven, CT. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
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