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Types of asthma
| Type of asthma | Extrinsic | Intrinsic |
|---|---|---|
| Allergic | Idiosyncratic | |
| Frequency | Most common | Least common |
| Association with atopy | + | − |
| IgE-mediated mast cell degranulation | ||
| Age of onset | Child | Adult |
| Main precipitants | Allergens in house dust, animal dander, feathers, animal hairs, moulds, milk, eggs, fish, fruit, nuts, non-steroidal anti-inflammatory agents and antibiotics | Emotional stress, gastro-oesophageal reflux, vagally-mediated responses |
