<prompt> The most common cause of Addisons disease is:Autoimmune adrenalitisMeningococcal septicemiaMalignancyTuberculosis  <response>: Primary Chronic Adrenocoical Insufficiency Addison Disease Uncommon disorder resulting from progressive destruction of the adrenal coex More than 90 of all cases are attributable to one of four causes: Autoimmune adrenalitis Accounts for 60 to 70 of cases; it is by far the most common cause of primary adrenal insufficiency in developed countries Infections Paicularly tuberculosis and those produced by fungi- histoplasmosis, AIDS Tuberculous adrenalitis, which once accounted for as much as 90 of cases of Addison disease, has become less common with the development of antituberculous agents Genetic conditions - Adrenogenital syndromes Metastatic cancers. 