| Rapid onset | Slow onset | |
| Frequency | 8-14% | 86-92% |
| Triggers | Allergen exposure | Respiratory tract infection |
| Fume or irritant inhalation | ||
| Exercise or emotional stress | ||
| Aspirin (ASA) and NSAIDs | ||
| Pathology | Empty, dry airways | Mucus filled, wet airways |
| Neutrophil-predominant | Eosinophil-predominant | |
| Cause of obstruction | Bronchoconstriction | Mucus plugging & edema |
| Recovery | Rapid | Less rapid |
