![]() Then wait for 15 minutes to see whether you develop any symptoms that suggest OAS.If you feel no tingling or itchiness or swelling then take a bite, chew well and spit it out.Rub the food on the outside and then the inside of your lip.If you are worried about eating other foods then you can safely test them yourself: Almond, hazelnut and walnut are the nuts often involved in OAS. Standard allergy tests covering peanuts and all the tree nuts are also often helpful. A skin prick test for birch pollen is the most useful of the standard allergy tests. This is a more sensitive test and can be effective. Food allergens causing OAS are usually damaged or destroyed by heat and processing, and so are likely to be destroyed during the process of making the extracts used in these tests.Īllergy skin prick, testing using the juices from the fresh fruits and raw vegetables themselves, can be tried. The standard skin prick testing and specific IgE (RAST) blood tests that are used for food allergy are unreliable. Reactions occur to foods that don't typically cause OAS, such as cashew, pistachio, or macadamia nuts.Reactions occur to processed or cooked food, or.The symptoms are unusual or severe, or.This is more useful for making the diagnosis than allergy testing. Rubber latex cross-reacts with almond, apple, apricot, avocado, banana, chestnut, cherry, dill, fig, ginger, kiwi, mango, melon, oregano, papaya, passion fruit, peach, pear, plum, raw potato, sage, and raw tomato.ĭoctors may be able to make a diagnosis of OAS by identifying symptoms that are clearly linked to foods. Weed pollen (usually mugwort) cross-reacts with melon, apple, peach, banana, celery, celeriac, carrot, parsnip, raw potato, courgette, bell pepper, broccoli, cabbage, fennel, garlic, onion, parsley, hazelnut, sunflower seeds, aniseed, angelica, chervil, coriander, cumin, dill, fennel, parsley, rosemary, and honey. Rye-grass pollen cross-reacts with melon, peanut, tomato, and watermelon. Herbs and spices: fennel, wheat, cumin, coriander, parsley, camomile tea, honey.īirch pollen cross-reacts with almond, apple, apricot, raw carrot, raw celery, cherry, coriander, fennel, hazelnut, kiwi, nectarine, parsley, parsnip, peach, pear, peppers, plum, raw potato, prune, tomato, and walnut.Nuts: walnut, peanuts, hazelnuts, almonds, brazil nuts.Vegetables: carrot, potato, spinach, celery, cucumber, tomato.Fruits: apple, cherries, peach, plum, pear, nectarine, strawberries, apricots, melon, watermelon.Most people with OAS are sensitive to one or two foods, although some will find they may develop problems with a number of the different foods.įoods that are more common causes of oral allergy syndrome include: There is, at present, no way to predict who will develop a problem with any particular food. ![]() People who have hay fever from March to the end of July are probably allergic to both grass and tree pollen and are not only more likely to develop OAS, but will be potentially allergic as well to a much wider range of foods, including fruits, vegetables, tree nuts and peanuts.Īllergy to grass and mugwort pollens can also cause OAS and a similar condition occurs in some patients with rubber latex allergy. People who have hay fever from February to May are usually allergic only to tree pollen and are more likely to react only to fruits and some nuts such as hazelnuts. Many people with OAS have had hay fever symptoms (such as itchy eyes and nose, and sneezing) between February and July for a number of years before developing OAS. It has been estimated that as many as 3 in every 4 people with allergy to birch experience a sensation in the lips or tongue after eating raw apples, which is a mild form of OAS. The most common allergen in the UK is birch pollen. There are several allergens that can be responsible for the condition. The symptoms are caused by cross-reactivity to plant proteins (allergens), which are similar to those in pollen.
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