| Acute (days to weeks) |
| Acute idiopathic interstitial pneumonia (AIP, Hamman-Rich syndrome) |
| Eosinophilic pneumonia |
| Hypersensitivity pneumonitis |
| Cryptogenic organizing pneumonia |
| Subacute (weeks to months) |
| Sarcoidosis |
| Some drug-induced ILDs |
| Alveolar hemorrhage syndromes |
| Cryptogenic organizing pneumonia |
| Connective tissue disease (systemic lupus erythematosus or polymyositis) |
| Chronic (months to years) |
| Idiopathic pulmonary fibrosis |
| Sarcoidosis |
| Pulmonary Langerhans cell histiocytosis |
| Chronic hypersensitivity pneumonitis |
