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What is Hypoaldosteronism and explain in detail?
Hypoaldosteronism is an endocrinological disorder characterized by decreased levels of the hormone aldosterone.  Similarly, isolated hypoaldosteronism is the condition of having lowered aldosterone without corresponding changes in cortisol. (The two hormones are both produced by the adrenals.)

Presentation
Causes
There are several causes for this condition, including adrenal insufficiency, congenital adrenal hyperplasia, and some medications such as certain diuretics, NSAIDs, and ACE inhibitors.
Primary aldosterone deficiencyPrimary adrenal insufficiency
Congenital adrenal hyperplasia (21 but not 11β and 17)
Aldosterone synthase deficiencySecondary aldosterone deficiencySecondary adrenal insufficiency
Diseases of the pituitary or hypothalamusHyporeninemic hypoaldosteronism (due to decreased angiotensin 2 production as well as intra-adrenal dysfunction)Renal dysfunction-most commonly diabetic nephropathy
NSAIDs
Ciclosporin

Mechanism
Hypoaldosteronism may result in high blood potassium and is the cause of type 4 renal tubular acidosis, sometimes referred to as hyperkalemic RTA or tubular hyperkalemia. However, the acidosis, if present, is often mild