If you drink a lot of coffee or power drinks to stay awake and keep up with the demands of your day, you may have "adrenal fatigue." a term coined in 1998 by James Wilson, PhD. Your adrenal glands, the small organs above the kidneys, respond to stress by releasing hormones like cortisol and adrenaline. These hormones are part of your "fight or flight" response. They increase your blood pressure and your heart rate.
If you have any prolonged stress under any condition, like death of a family member or challenges at work, your adrenal glands can actually burn out, which decreasing the production of cortisol. This is called adrenal fatigue, and there are no approved tests for it. But cortisol is essential—it helps control blood sugar levels, regulate metabolism, and can help reduce inflammation. It has an effect on salt and water balance and helps control blood pressure