Hypoadrenocorticism, also known as Addison's disease, is a rare hormonal disorder that affects dogs. The condition occurs when the adrenal glands fail to produce enough cortisol and aldosterone. Luckily, there are a few synonyms for hypoadrenocorticism that pet parents can use to better understand and communicate the condition to their veterinarian. Some of the more commonly used synonyms include primary adrenal insufficiency, chronic adrenal insufficiency, and hypocortisolism. Additionally, some vets may use the terms Addisonian crisis or adrenal crisis to describe a severe and potentially life-threatening episode of hypoadrenocorticism. No matter what you call it, prompt veterinary care and ongoing treatment are crucial for managing this condition in dogs.