Primary adrenal insufficiency
Autoimmune disease (70-90%)
Tuberculosis previously most common cause
Other causes include infectious, metastatic cancer, lymphoma, adrenal hemorrhage, infarction, drugs
Typically presents in adults between 30 and 50 years of age
All ages, races, genders can be affected
Higher incidence with other autoimmune deficiencies
Tuberculosis previously most common cause
Other causes include infectious, metastatic cancer, lymphoma, adrenal hemorrhage, infarction, drugs
All ages, races, genders can be affected
Addison's disease
Corticosteroid withdrawal
Sheehan's syndrome
Secondary adrenal insufficiency - deficiency of ACTH 
Cushing's syndrome
Tertiary adrenal insufficiency - deficiency of CRH 
Wilson's disease
Zollinger-Ellison syndrome