no history of allergy, e.g. eczema, hay fever; may be family history asthma.
late onset
no seasonal variation
investigation - normal IgE; variable eosinophilia; skin prick test negative
patients may be aspirin-sensitive - aspirin may have a role as a trigger factor in about 5% of patients with asthma. Asthma and aspirin sensitivity is associated with nasal polyps forming Samster's triad.
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