Addison's disease, also called adrenal insufficiency, is an uncommon disorder that occurs when your body doesn't produce enough of certain hormones. In Addison's disease, your adrenal glands, located just above your kidneys, produce too little cortisol and, often, too little aldosterone. Tuberculosis (TB) is the most common cause of Addison's disease worldwide, but it's rare in the UK. TB is a bacterial infection that mostly affects the lungs but can also spread to other parts of your body. It can cause Addison's disease if it damages your adrenal glands.