- Idiopathic pulmonary fibrosis
- Idiopathic interstitial pneumonia
- Human infection with highly pathogenic avian influenza
- Hiatal hernia
- Formaldehyde poisoning
- Emphysema
- Egg allergy
- Drug-induced lung disease
- Diffuse alveolar hemorrhage
- Difficulty breathing
- Diaphragmatic paralysis
- Decompression sickness
- Cystic fibrosis of the lung
- Cyanosis
- Cough variant asthma
- Congenital bronchogenic cyst