Abstract
Asthma is a chronic inflammatory disease of the airways. It is characterized by recurrent episodes of dyspnoea, wheeze and cough caused by reversible airways obstruction. Three factors are responsible for the airways narrowing: bronchial muscle contraction, mucosal swelling/inflammation and increased mucous production ( Fig. 1 ). About 10–15% of the UK population have asthma and the number appears to be growing although there is some difficulty understanding why. It affects 1 in 20 adults and 1 in 10 children. Approximately 5.1 million people are currently being treated for asthma in the UK.
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