Oral allergy syndrome or OAS is a type of food allergy classified by a cluster of allergic reactions in the mouth in response to eating certain (usually fresh) fruits, nuts, and vegetables that typically develops in adult hay fever sufferers.
OAS is perhaps the most common food-related allergy in adults. OAS is not a separate food allergy, but rather represents cross-reactivity between distant remnants of tree or weed pollen still found in certain fruits and vegetables. Therefore, OAS is typically only seen in tree and weed allergic patients, and is usually limited to ingestion of only uncooked fruits or vegetables.
However, unlike other food allergies, in oral allergy syndrome, the reaction is limited to the mouth, lips, tongue and throat.
OAS is a Type 1 or IgE-mediated immune response, which is sometimes called a "true allergy". The body's immune system produces IgE antibodies against pollen; in OAS, these antibodies also bind to (or cross-react with) other structurally similar proteins found in botanically related plants.
OAS can occur anytime of the year but is most prevalent during the pollen season. Individuals with OAS usually develop symptoms within a few minutes after eating the food.
Other articles related to "oral allergy syndrome, allergy, syndrome":
... must be managed in conjunction with the patient's other allergies, primarily the allergy to pollen ... The syndrome will abate within 2–3 years if the patient moves to an area free of the triggering pollen ... Moving usually results in the development of allergy to the local pollens ...
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