A primary adrenal insufficiency caused by a sudden defective production of adrenal steroids (cortisol and aldosterone). It represents an emergency, thus the rapid recognition and prompt therapy are critical for survival even before the diagnosis is made. The disease is MONDO_0019801 (acute adrenal insufficiency). Also known as: Addisonian crisis, acute adrenal failure, acute adrenocortical insufficiency, adrenal crisis, adrenocortical crisis.