Causes
- Bronchial hyperresponsiveness triggered by allergens or cold air
- leading to bronchospasm and thick mucus secretion
Symptoms
- Expiratory wheezing
- tightness in the chest
- breathlessness
- nocturnal coughing fits
Risk Factors
- Atopic allergic history
- airborne allergens such as dust mites
- pollen and pet dander
- ambient air pollution
- parental asthma