What is oral allergy syndrome primarily characterized by?

Oral allergy syndrome is primarily characterized by symptoms that appear in the mouth and pharynx. It is a form of allergic reaction that occurs when certain proteins in fresh fruits, vegetables, and nuts trigger an immune response in individuals who are also allergic to specific pollen. The most common symptoms include itching, tingling, or swelling of the lips, mouth, and throat. This localized reaction is important to distinguish since it occurs upon the immediate contact of these foods with the oral mucosa.

The other options primarily focus on symptoms that are associated with different types of allergic reactions. Skin rashes and eczema are typically associated with contact allergies or systemic allergic reactions. Respiratory issues and bronchospasms are characteristic of inhalant allergies and conditions like asthma. Gastrointestinal distress and vomiting are usually indicative of food intolerances or more severe food allergies but are not specifically linked to oral allergy syndrome. Thus, the emphasis on mouth and pharynx allergy symptoms aptly captures the essence of oral allergy syndrome.