The adrenal glands, located atop the kidneys, are the primary organs affected by Addison's Disease. What is Addison's Disease? Also known clinically as Primary Adrenal Insufficiency , this is a rare, chronic endocrine disorder where your adrenal glands sustain severe damage and can no longer produce enough vital hormones—specifically Cortisol and Aldosterone. Key Function: These hormones are absolutely critical for regulating blood pressure, maintaining metabolism, and managing the body's biological response to stress. Without them, a simple illness or minor physical injury can rapidly become a life-threatening event. Symptoms Symptoms of Addison's disease usually develop very slowly over several months, often mimicking other chronic illnesses like chronic fatigue syndrome. The most distinctive clinical signs include: Hyperpigmentation: A noticeable, unexplained darkening of the skin (bronzing), es...