Interstitial lung disease (ILD) refers to a broad category of lung diseases. The three most common types of occupational Interstitial lung disease (ILD) are asbestosis, chronic silicosis, and coal worker's pneumoconiosis (CWP). Hypersensitivity pneumonitis is a cell-mediated immune reaction to inhaled antigens. Interstitial lung disease (ILD) is a well-known complication of various connective tissue diseases which includes scleroderma, rheumatoid arthritis, Sjögren's syndrome, polymyositis or dermatomyositis, and systemic lupus erythematosus.