Rheumatoid Arthritis Interstitial Lung Disease, also known as rheumatoid lung, is related to interstitial lung disease and pulmonary fibrosis. An important gene associated with Rheumatoid Arthritis Interstitial Lung Disease is MUC5B (Mucin 5B, Oligomeric Mucus/Gel-Forming), and among its related pathways/superpathways are Cytokines and inflammatory response and Lung fibrosis. The drugs Pirfenidone and Narcotics have been mentioned in the context of this disorder. Affiliated tissues include lung and lymph node.