Hair Cortisol in Asthma or Allergic Rhinitis Treated With Topical Corticosteroids

The purpose of this study is to prospectively examine the relation between topical corticosteroid use and hair cortisol concentration, among patients with moderate persistent asthma or allergic rhinitis. The investigators hypothesize that patients with asthma or allergic rhinitis treated with topical corticosteroids (i.e. inhaled corticosteroids (ICS) or intranasal glucocorticoids (INGC)) have higher levels of hair cortisol after 3 months of treatment than during the 3 months prior to initiation of treatment.