Although the words may sound similar Adrenal Insufficiency is NOT the lack of adrenaline, but the lack of cortisol and often aldosterone.
Hydrocortisone, NOT epinephrine is the medication needed in a crisis. Endocrineweb’s “An Overview of the Adrenal Glands” has a very helpful overview explaining the hormones produced in the adrenal gland. Important to note is that the adrenal cortex produces cortisol and aldosterone which are both vital to life. The adrenal medulla produces adrenaline, which while important, is not vital to life.
In short the lack of cortisol and/or aldosterone can kill, lack of adrenaline does not.
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