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Addison's disease

Addison's disease (also known as chronic adrenal insufficiency, or hypocortisolism) is a rare endocrine disorder, first described by British physician Thomas Addison. more...

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It is estimated that it affects about 1 to 2 in 100,000 people.

It occurs when the adrenal glands, seated above the kidneys, fail to produce enough of the hormone cortisol and, sometimes, the hormone aldosterone.

Addison's disease refers specifically to primary adrenal insufficiency, in which the adrenal glands themselves malfunction; secondary adrenal insufficiency occurs when the pituitary gland does not produce enough adrenocorticotropic hormone (ACTH) to adequately stimulate the adrenal glands.

Signs and symptoms

Early signs

Addison's disease progresses slowly, and symptoms may not present or be noticed until some stressful illness or situation occurs. Common symptoms are:

  • chronic fatigue that gradually worsens
  • muscle weakness
  • loss of appetite
  • weight loss
  • nausea/vomiting
  • diarrhea
  • low blood pressure that falls further when standing (orthostatic hypotension)
  • areas of hyperpigmentation (darkened skin), known as melasma suprarenale.
  • irritability
  • depression
  • craving for salt and salty foods
  • hypoglycemia (worse in children)
  • for women, menstrual periods that become irregular or cease
  • tetany (particularly after drinking milk) due to phosphate excess
  • numbness of the extremities, sometimes with paralysis, due to potassium excess

Addisonian crisis

An illness or accident can aggravate the adrenal problems and cause an Addisonian crisis in which the symptoms include:

  • brown coating on tongue and teeth due to iron loss hemolysis
  • sudden penetrating pain in the legs, lower back or abdomen
  • severe vomiting and diarrhea, resulting in dehydration
  • low blood pressure
  • loss of consciousness
  • hypoglycemia

Untreated, an Addisonian crisis can be fatal. It is a medical emergency.

Diagnosis

In suspected cases of Addison's disease, one needs to demonstrate that adrenal hormone levels are low after appropriate stimulation with synthetic pituitary hormone.

Once demonstrated, the cause of adrenal failure needs to be elucidated. The most common cause is autoimmune, and can be tested for with an assay for 21-hydroxylase antibodies. If there are no antibodies present, infectious or genetic causes should be sought. This may include imaging of the adrenal glands, tests for tuberculosis or HIV infection, and searching for metastatic cancer.

Pathophysiology

Eighty to ninety percent of cases of Addison's disease are said to be due to autoantibodies directed against adrenal cells containing 21-hydroxylase, an enzyme involved in the production of cortisol and aldosterone.

Read more at Wikipedia.org


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