Asthma is a chronic lung disease characterized by inflammation and narrowing of the airways, making it difficult to breathe. Asthma can cause symptoms such as wheezing, shortness of breath, chest tightness, and coughing. These symptoms can be triggered by a variety of factors such as allergens, pollution, and stress. Asthma can be treated with medication, but it can lead to serious complications if left untreated. People who have asthma are at a higher risk of developing other lung problems such as pneumonia and bronchitis.