autoimmune thyroid disease, myasthenia gravis and/or thymoma, Sjögren's syndrome, pernicious anaemia, idiopathic thrombopenic purpura, Addison's disease, type 1 diabetes mellitus
, autoimmune haemolytic anaemia, systemic lupus erythematosus, dermatitis herpetiformis.
The immune system marker HLA-B8 and/or DR3 or DR5 seems to be an important factor in Type 3 MAS.
Other conditions found in various combinations in MAS:
Type 1 MAS: pemphigus, autoimmune thyroid disease.