Drug-related

• Amiodarone
• Antibacterials (nitrofurantoin, sulfonamides)
• Antineoplastics (bleomycin, cyclophosphamide, methotrexate, nitrosoureas)
• Antirheumatics (gold salts, penicillamine)
• Phenytoin

• Inorganic dust (asbestos, silica, hard metals, beryllium)
• Organic dust or hypersensitivity pneumonitis (thermophilic actinomycetes, avian antigens, Aspergillus spp.)
• Gases, fumes, vapors (chlorine, isocyanates, paraquat, sulfur dioxide)
• Ionizing radiation
• Talc (injection drug users)

• Disseminated fungus (coccidioidomycosis, blastomycosis, histoplasmosis)
• Disseminated mycobacteria
• Pneumocystis jiroveci pneumonia
  
• Viruses

• Idiopathic fibrosing interstitial pneumonia [idiopathic pulmonary fibrosis (IPF)]:
  • Acute interstitial pneumonia (AIP)
  • Desquamative interstitial pneumonia (DIP)
  • Nonspecific interstitial pneumonitis (NSIP)
  • Usual interstitial pneumonia (UIP)
  • Respiratory bronchiolitis-associated interstitial lung disease (RB-ILD)
• Bronchiolitis obliterans–organizing pneumonia (BOOP)

• Acute respiratory distress syndrome (ARDS)
• Amyloidosis
• Ankylosing spondylitis
• Autoimmune disease: dermatomyositis, polymyositis, rheumatoid arthritis, systemic sclerosis (scleroderma), systemic lupus erythematosus
• Chronic eosinophilic pneumonia
• Goodpasture’s syndrome
• Idiopathic pulmonary hemosiderosis
• Inflammatory bowel disease
• Eosinophilic granuloma (Langerhans cell histiocytosis, histiocytosis X)
• Lymphangitic carcinomatosis
• Lymphangioleiomyomatosis (LAM)
• Pulmonary edema
• Pulmonary venous hypertension
• Sarcoidosis
• Wegener’s granulomatosis