Interfering with airway nerves in cough associated with asthma.

Cough is a troublesome and often refractory symptom of asthma, which is associated with poor control of disease. The pathogenesis of asthmatic cough has mainly been attributed to bronchoconstriction, but recent evidence indicate that cough reflex hypersensitivity or neuronal dysfunction is a feature of asthma, even in those with mild stable disease. This is likely resistant to the mainstay treatment ICS/LABA which inhibits classic asthmatic response. Such refractory cough might manifest more predominantly in the day-time rather than night-time. Treatment options of such refractory cough or cough reflex hypersensitivity in asthma targeting the nerves (LTRAs, tiotropium, and potentially bronchial thermoplasty) are discussed.