Adrenal fatigue isn't an accepted medical diagnosis. It is a lay term applied to a collection of nonspecific symptoms, such as body aches, fatigue, nervousness, sleep disturbances and digestive problems.

Your adrenal glands produce a variety of hormones that are essential to life. The medical term "adrenal insufficiency" refers to inadequate production of one or more of these hormones as a result of an underlying disease or surgery.

Signs and symptoms of adrenal insufficiency may include:

• Fatigue
• Body aches
• Unexplained weight loss
• Low blood pressure
• Lightheadedness
• Loss of body hair
• Skin discoloration (hyperpigmentation)