However, reaction to one or more foods in any given category does not necessarily mean a person is allergic to all foods in that group. Reactions may be associated with one type of food, with new reactions to other foods developing later. This does not mean that everyone with an allergy to ragweed will experience adverse effects from all or even any of these foods. For instance, an allergy to ragweed is associated with OAS reactions to banana, watermelon, cantaloupe, honeydew, zucchini, kiwifruit, and cucumber. Cross reactions Īllergies to a specific pollen are usually associated with OAS reactions to other certain foods. The main exceptions to this are celery and nuts, which may cause reactions even after being cooked. īecause the allergenic proteins associated with OAS are usually destroyed by cooking, most reactions are caused by eating raw foods. When tropical foods initiate OAS, allergy to latex may be the underlying cause. Furthermore, some individuals have severe reactions to certain fruits and vegetables that do not fall into any particular allergy category. While the tree pollen allergy has been worked out, the grass pollen is not well understood. Individuals with an allergy to tree pollen may develop OAS to a variety of foods. Some individuals may only show allergy to one particular food, and others may show an allergic response to many foods. OAS produces symptoms when an affected person eats certain fruits, vegetables, and nuts. Development, causes Ī person with an allergic disposition is sensitized to allergenic pollen proteins through the respiratory route can develop an allergy to heat labile food proteins (for example profilins) in certain fruits and vegetables, which cross-react with pollen proteins. Rarely, OAS may be severe and present as wheezing, vomiting, hives, low blood pressure, or anaphylaxis. Vomiting, diarrhea, severe indigestion, or cramps may occur. If an affected person swallows the raw food, and the allergen is not destroyed by the stomach acids, it is likely that there will be a reaction from histamine release later in the gastrointestinal tract. : 405 The natural course of the disease is that it usually persists. Stomach, it is broken down by the acid, and the allergic reaction does not progress further. Swelling of the lips, tongue, and uvula, and a sensation of tightness in the throat may be observed. Sometimes other reactions can be triggered in the eyes, nose, and skin. The most common reaction is an itching or burning sensation in the lips, mouth, ear canal, or pharynx. Individuals with OAS may have any of a number of allergic reactions that usually occur very rapidly, within minutes of eating a trigger food. Individuals with OAS usually develop symptoms within minutes of eating the food. OAS can occur any time of the year, but is most prevalent during the pollen season. 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 is a Type 1 or immunoglobulin E-mediated hypersensitivity, which is sometimes called a ' true allergy'. In adults, up to 60% of all food allergic reactions are due to cross-reactions between foods and inhalative allergens. It is usually limited to ingestion of uncooked fruits or vegetables. Therefore, OAS is only seen in people with seasonal pollen allergies, and mostly people who are allergic to tree pollen. 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. It typically develops in adults with hay fever. Oral allergy syndrome ( OAS) or pollen-food allergy is a type of food allergy classified by a cluster of allergic reactions in the mouth and throat in response to eating certain (usually fresh) fruits, nuts, and vegetables. Medical condition Oral allergy syndrome (Pollen-Food Allergy)

Pollen allergy cross reactivity chart