Addison's disease symptoms usually happen slowly, often over months. The disease can move so slowly that people who have it may ignore the symptoms at first. Then a stress, such as illness or injury, makes symptoms worse. Symptoms may include: 
Extreme fatigue
Weight loss and loss of appetite
Areas of darkened skin
Low blood pressure, even fainting
Salt craving
Low blood sugar, also called hypoglycemia
Nausea, diarrhea or vomiting
Abdominal pain
Muscle and joint pain
Irritability
Depression
Body hair loss or sexual issues in some people
 Acute adrenal failure, known as addisonian crisis Sometimes the symptoms of Addison's disease appear suddenly. Acute adrenal failure can lead to life-threatening shock. Seek emergency treatment for the following: 
Severe weakness
Confusion
Pain in the lower back or legs
Severe abdominal pain, vomiting and diarrhea, leading to dehydration
Reduced consciousness or delirium
Low blood pressure
