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Addison's disease

Addison's disease, also known as primary adrenal insufficiency and hypocortisolism, is a long-term endocrine disorder in which the adrenal glands do not produce enough steroid hormones. Symptoms generally come on slowly and may include abdominal pain, weakness, and weight loss.

Symptoms tend to be non-specific and include fatigue, nausea, darkening of the skin and dizziness upon standing.
Treatment involves taking hormones to replace those not produced by the adrenal glands.