What allergic asthma is and how it develops
Allergic asthma arises when the immune system reacts to airborne allergens such as pollens, house dust mites, mould spores, or animal dander. Exposure can lead to airway inflammation and bronchial spasm, producing wheeze, cough and breathlessness. Genetic susceptibility and coexisting allergic conditions like allergic rhinitis or eczema increase the likelihood of developing allergic asthma.