
Addison’s disease, also known as primary adrenal insufficiency, is an endocrine condition involving destruction of parts of the adrenal gland (which sits atop the kidney), resulting in a deficiency of the steroid hormones produced by this gland, including cortisol and aldosterone. It can have many causes, though the two most common are autoimmune (in developed countries) and infectious (in developing nations) in nature. Good info