Primary Adrenal Insufficiency (Addison's Disease)

Primary Adrenal Insufficiency (Addison's Disease) is a condition where the adrenal glands, which sit on top of the kidneys, do not produce enough important hormones. These hormones include cortisol, which helps the body respond to stress, and aldosterone, which controls salt and water balance. When these hormones are low, people may feel very tired, weak, and dizzy, especially when standing up. They might also experience weight loss, darkening of the skin, and cravings for salty foods. This condition affects the endocrine system, which regulates hormones essential for many body functions. Without enough adrenal hormones, the body cannot maintain normal blood pressure or respond properly to stress, which can be life-threatening if untreated.

Primary Adrenal Insufficiency (Addison's Disease) is a disorder characterized by the destruction or dysfunction of the adrenal cortex leading to deficient production of glucocorticoids (cortisol), mineralocorticoids (aldosterone), and adrenal androgens. The most common cause is autoimmune adrenalitis, where autoantibodies target adrenal enzymes such as 21-hydroxylase. Other causes include infections like Mycobacterium tuberculosis, adrenal hemorrhage, or metastatic infiltration. The deficiency of cortisol results in impaired stress response, hypoglycemia, and fatigue, while aldosterone deficiency causes hyponatremia, hyperkalemia, and hypotension. Clinically, patients present with chronic fatigue, weight loss, hyperpigmentation due to elevated ACTH, and electrolyte abnormalities. The condition is significant because untreated adrenal insufficiency can lead to an adrenal crisis, a medical emergency with severe hypotension and shock.