What is adrenal fatigue? Adrenal fatigue results when the adrenal glands function below their necessary level. Most commonly associated with intense or prolonged stress, it can also arise during or after acute or chronic infections, especially respiratory infections such as influenza, bronchitis or pneumonia. As the name suggests, its main symptom is fatigue that is not relieved by sleep.  You may look and act relatively normal with adrenal fatigue and may not have any obvious signs of physical illness, yet you live with a general sense of unwellness, tiredness or "gray" feelings. People experiencing adrenal fatigue often have to use...