Allergies are abnormal reactions of the body to a previously encountered allergen introduced by inhalation, ingestion, injection, or skin contact, often causing itchy eyes, runny nose, wheezing, skin rash, or diarrhea.
A food allergy is an adverse immune response triggered by a food protein, distinct from food intolerances. Protein in food is the most common allergic component occurring when the immune system mistakenly identifies a protein as harmful.
Asthma is a chronic respiratory condition where the airways become inflamed and narrowed, making it difficult to breathe. Though its exact cause is unknown, triggers include genetic, environmental, and occupational factors.