Understanding Asthma: Causes, Symptoms, and Triggers

Here are the two sentences, rewritten with some corrections:

1. Asthma is a chronic respiratory disease characterized by inflammation and narrowing of the airways, which can lead to recurrent episodes of wheezing, coughing, chest tightness, and shortness of breath.

2. It is triggered by various factors, including allergens (such as pollen, dust mites, pet dander), irritants (such as smoke, pollution), exercise, cold air, and emotional stress.