Final answer:
Asthma is a chronic illness characterized by inflammation and narrowing of the bronchioles, making it difficult to breathe. Medication and avoiding triggers can help control asthma.
Step-by-step explanation:
Asthma is a chronic illness characterized by inflammation and narrowing of the bronchioles, making it difficult to breathe. It is triggered by various factors such as allergens, cold air, exercise, and stress. Medication and avoiding triggers can help control asthma. Some regions with high air pollution have higher rates of asthma and related diseases.