Primary hypoadrenocorticism (Addison’s disease) is known as the great imitator for many reasons. Learn about the anatomy and physiology to gain an understanding of how the adrenal glands function and what happens when things start to go wrong. Awareness of the pathophysiology and typical signalment can increase the likelihood of diagnosis. Hallmark signs and electrolyte imbalances are all part of the Addisonian crisis. This talk helps you understand the emergency patient and what to do in a crisis.