Asthma is an inflammatory airways disease characterised by recurrent airway obstruction and bronchial hyperreactivity. The lung’s bronchial have increased muscle tone, narrowing the openings (bronchoconstriction); the bronchial wall also becomes swollen and there is increased mucus production, which further obstructs airflow.
While asthma is not curable, symptoms vary over time and notably are reversible – i.e. the changes in the airways can return to almost normal, either spontaneously or with medication. Asthma is not progressive per se, however over time there may be long-term damage to the bronchi walls that may limit this reversibility.