Metabolic |
   Acromegaly |
   Pregnancy |
   Hypothyroidism |
Autoimmune |
   Sjogren syndrome |
   Systemic lupus erythematosus |
   Relapsing polychondritis |
   Churg-Straus syndrome |
   Wegner granulomatosis |
Other |
   Cystic fibrosis |
   Kartagener syndrome |
   Sarcoidosis |
   Immunodeficiency |