Early-stage symptoms of Addison’s disease are similar to other more common health conditions, such as depression or flu. You may experience: fatigue (lack of energy or motivation); muscle weakness; low mood; loss of appetite and unintentional weight loss, craving for salty foods and increased thirst. Over time, these problems may become more severe and you may experience further symptoms, such as dizziness, nausea, vomiting, diarrhea, abdominal / joint / back pain, fainting, cramps and exhaustion. You may also develop small areas of darkened skin, or darkened lips or gums. This can cause symptoms such as difficulty concentrating, confusion, anxiety and even unconsciousness (particularly in children). Some people with Addison’s disease also develop low blood sugar (hypoglycaemia). This causes your symptoms to get progressively worse and eventually lead to a life-threatening situation called an adrenal or Addisonian crisis.