Although<unk>  was first introduced as a clinical entity 140 years ago, the main cause of the disease remains elusive. The contributory factors are believed to be a combination of: antigens(environment), genetic factors, and the immune system.
Sarcoidosis causes
Bronchiolitis causes
Uveitis causes
Silicosis causes
Lymphangitis causes
Eosinophilic pneumonia causes
Lymphomatoid granulomatosis causes
Pneumoconiosis causes