The adrenal glands sit above the kidneys and are composed of an inner medulla and outer cortex. The cortex secretes corticosteroids like mineralocorticoids and glucocorticoids, and androgenic hormones. Mineralocorticoids regulate sodium and potassium levels while glucocorticoids increase blood glucose and promote fat mobilization. The medulla secretes epinephrine and norepinephrine to stimulate the sympathetic nervous system. Adrenal insufficiency can cause severe renal disorders and electrolyte imbalances due to lack of mineralocorticoid production. Dental management of patients with adrenal insufficiency requires consideration of their corticosteroid needs and risk of stress.