HCA image Allergies are an overreaction of the immune system to substances that under normal circumstances would cause no reaction in most people. The results of this immunologic overreaction are symptoms such as sneezing, watery eyes, and itching.

Asthma is a disease in which the airways become blocked or narrowed due to inflammation, causing wheezing, coughing, shortness of breath, breathing trouble, and other serious symptoms. In the case of a severe asthma attack, a person may need emergency treatment to restore normal breathing.