Hydrocortisone is a corticosteroid hormone or glucocorticoid produced by zona fasciculata of the adrenal cortex, which is a part of the adrenal gland. It is usually referred to as the “stress hormone” as it is involved in response to stress and anxiety, controlled by corticotropin-releasing hormone (CRH). It increases blood pressure and blood sugar, and reduces immune responses. It has a role as an anti-inflammatory drug, an anti-allergic agent, an anti-asthmatic drug, a human metabolite, a mouse metabolite and a drug allergen.