Oral allergy syndrome (OAS), which is also known as Pollen-Food Allergy involves a cluster of oral symptoms and hives that occur in people with pollen allergies. Pollen allergies are often seen in people with autoimmune diseases.

Typical foods that trigger OAS include cantaloupe, nuts, banana, watermelon, honeydew, zucchini, cucumber and bee pollen.

Symptoms vary but commonly include an itching or burning sensation in the lips, mouth, and/or pharynx. Itching, swelling, rash, and hives can also be triggered in the eyes, nose, and skin. Swelling of the lips, tongue, and uvula and a sensation of tightness in the throat may also be observed, and these symptoms can rarely progress to anaphylaxis