Allergies
As the name implies, allergies are the most common cause of allergic asthma. When you are exposed to a trigger, the immune system will work to protect your body against foreign invaders. It might attack some harmless substances, such as pollen or dander, in the eyes, lungs, or noses. At the same time, this activity would lead to the production of histamine, a substance that can cause inflammation and swelling. That’s why people with allergic asthma tend to experience some symptoms like sneezing, itchy eyes, or runny nose. Each person might have different triggers. Some of the most common allergens include dust mites, cockroaches, mold, pollen, pet dander, smoke, or some chemical fumes from other products. [8]
