Allergic asthma is a type of asthma triggered by allergens, which are substances that can cause allergic reactions. Common allergens include pollen, dust mites, pet dander, and mold. When a person with allergic asthma encounters these triggers, their immune system overreacts, leading to inflammation and narrowing of the airways, making it difficult to breathe. Symptoms of allergic asthma can include coughing, wheezing, shortness of breath, and chest tightness. Managing allergic asthma often involves avoiding known allergens and using medications such as inhalers or antihistamines to control symptoms and reduce inflammation in the airways.