Diagnosis in adults.

Asthma is a syndrome characterized by recurrent respiratory symptoms, i.e. dyspnoea, wheezing, chest tightness or cough associated with reversible airflow limitation. Familiar predisposition, atopy, and exposure to allergen and sensitising agents are important risk factors for asthma, even the causes of asthma, meaning the factors responsible of the new cases of asthma instead of the exacerbations of asthma, remain largely undetermined