The term adrenal fatigue is used to describe a collection of symptoms, such as: fatigue body aches nervousness low blood pressure sleep disturbances digestive issues craving salt and sugar Your adrenal glands sit on top of each kidney. Their role is to produce hormones, including adrenaline and noradrenaline, both of which are used to prepare your body for fight or flight. Some people believe that when the adrenal glands are overworked they don’t produce enough of these hormones. The theory first came from a chiropractor in 1998. However, there is no scientific evidence that this condition exists.