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Doctor insights on: What Is The Difference Between Oral Allergy Syndrome And Shellfish Allergy

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What's the difference between a food allergy and "oral allergy syndrome"?

What's the difference between a food allergy and "oral allergy syndrome"?

Cause of Oral allerg: Oas is seen when people with high level of ragweed pollen allergy feel itchy mouth and throat when they eat melons, (watermelon, cantaloupe, honeydew and rarely cucumbers). Also, birch pollen allergy triggers this when eating peach family fruits ( cherries, apricots, nectarines, etc...), apples and pears. Diagnosis is made by positive tests to the pollen and history. Pollen immunotherapy may help. ...Read more

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Dr. Cynthia Lu
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Shellfish Allergy (Definition)

A shellfish allergy is an exaggerated immune response due to exposure to shellfish protein. The reaction can present with typical symptoms of hives, respiratory symptoms (cough, wheeze, shortness of breath), GI symptoms (abdominal pain, vomiting), swelling, loss of consciousness, and can be fatal. Symptoms typically present within minutes to a couple hours ...Read more


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I have oas(oral allergy syndrome) and I am also a pescetarian, i was wondering what kind of fruit i can eat?

I have oas(oral allergy syndrome) and I am also a pescetarian, i was wondering what kind of fruit i can eat?

Oral allergy: You can pre treat with an antihistamine before ingesting fruit or you can get allergy shots for tree pollen that with time tame your reactions to fruits, see an allergist for best advice. ...Read more

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How can I get rid off the oral allergy syndrome?

How can I get rid off the oral allergy syndrome?

Avoid offending food: Oral allergy syndrome due to allergic antibody (ige) to pollen which cross-reacts with heat labile proteins in raw fruits/vegetables e.g. Birch pollen ige cross-reacts with apple, peach, etc. Heating the fruit/vegetable destroys the cross-reacting proteins. Avoid the offending foods when raw; can be eaten cooked/canned. Sometimes allergy injections decrease pollen ige so can tolerate raw fruit. ...Read more

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Can oral allergy syndrome cause voice hoarsenss?

Can oral allergy syndrome cause voice hoarsenss?

Oral allergy synd: Yes, but it's not common. Many patients with this problem do not require specific treatment, because the symptoms are mild. Sometimes if they want to eat the fruit, they pre-medicate themselves with antihistamines. If the reactions are really bothersome or dangerous, with throat closing and hoarseness, the food should be avoided as best possible, and epi pen carried. ...Read more

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What can I eat if I have oral allergy syndrome and fructose malabsorption?

What can I eat if I have oral allergy syndrome and fructose malabsorption?

Avoid fruit: But you can eat meat, fish, fowl, starches, grains, dairy, eggs, all cooked vegetables, some raw vegetables, oils, spices. You'll want to avoid most fruit. ...Read more

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I have oral allergy syndrome and can't eat nuts but used a body wash with walnut shell in it. Will i get symptoms?

I have oral allergy syndrome and can't eat nuts but used a body wash with walnut shell in it. Will i get symptoms?

Oral allergy syndrom: Oral allergy syndrome are local symptoms on contact with certain food due to cross reactivities of those to environmental allergens. It usually does not cause life threatening events like in real food allergies. You can test it on a small area on your skin before applying it to the whole body to gaze how much symptoms you get. ...Read more

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I have oral allergy syndrome. Is there any advice on how to eat healthier when i cannoy eat any fresh fruit and most veg? Thanks

Yes: No one is allergic to all vegetables and fruits and thus you should be able to find something you can eat. Oral allergy syndrome is mainly a nuisance and does not lead to throat swelling or anaphylaxis. You may try taking an antihistamine about 1-2 hrs prior to eating the offending fruit or veggi and see it this helps. If not , staying away from them would be only logical. ...Read more

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Does steaming fruits get rid of symptoms from oral allergy syndrome?

Does steaming fruits get rid of symptoms from oral allergy syndrome?

Unlikely: Rather boiling or cooking, proteins need to denatured (destroyed), to stop them from triggering the symptoms. Unlikely that steaming alone would be enough, best wishes ...Read more

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Can you take whey protein if you have oas (oral allergy syndrome)?

Can you take whey protein if you have oas (oral allergy syndrome)?

Maybe: As long as you aren't allergic to whey, you should be able to take whey protein. Mostly oas is believed to be due to fruits or residual tree pollens on the food you eat. ...Read more

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How do you treat someone who has oral allergy syndrome?

How do you treat someone who has oral allergy syndrome?

No treatment: Oral allergy syndrome is not treatable. The only option is to avoid the food that triggers the reaction, although cooking the food can eliminate the reaction. ...Read more

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Are potato chips safe for oral allergy syndrome?

Are potato chips safe for oral allergy syndrome?

generally yes: The most common foods for oral allergy syndrome now known as pollen-food allergy syndrome is melons, banana, apple and other fresh fruits and some vegetables. Potato allergy is uncommon. Typically it is the "raw" fruit or vegetable that has the heat sensitive protein. Since potato chips are cooked they are usually very well tolerated. ...Read more

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I have oral allergy syndrome, so what are some healthy alternatives for snacks?

I have oral allergy syndrome, so what are some healthy alternatives for snacks?

Cook the food: Oral allergy syndrome can be caused by a large variety of foods, so the answer to your question depends on the foods that bother you. Most foods that cause oral allergy syndrome are due to proteins that are destroyed by heat, so cooking the food may solve the problem. ...Read more

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I have oral allergy syndrome, so does that mean that I am allergic to nuts too?

I have oral allergy syndrome, so does that mean that I am allergic to nuts too?

No: It does not necessarily mean you are allergic to nuts--you should be tested by an allergist if you are concerned about possible tree nut allergy. ...Read more

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My daughter was diagnosed with oral allergy syndrome: are the symptoms year round and permanent?

Usually: Relatively common oral allergy syndrome (oas) occurs when the immune system mistakes one protein for another. In oas seasonal allergies to birch pollen result in itchy mouth & throat whenever certain raw fruits & vegetables are eaten. Most common are apple, carrot, citrus & peach. Ragweed & melon have a similar association. No symptoms occur if the foods are cooked. The condition is persistent. ...Read more

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Do over-the-counter allergy medicines work for oral allergy syndrome if you take a pill before eating?

No: The only thing that works for oas is allergy shots to reduce your sensitivity. I don't know exactly why that is, but i've never met a single patient who had found any medication that prevented oas symptoms. ...Read more

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How to know if i need a epipen (epinephrine) oral allergy syndrome?

How to know if i need a epipen (epinephrine) oral allergy syndrome?

Difficulty breathing: It is unusual to need epipen (epinephrine) for oral allergy syndrome. If you experience throat closing, difficulty breathing, wheezing or uncontrollable coughing then I would administer and call 911. ...Read more

Dr. John Chiu
2,586 doctors shared insights

Allergies (Definition)

Allergies occur when your immune system is triggered by envirionmental factors it should ignore--for example, pollen in the air, or dander on a cat or dog--and creates cells to fight against them. An allergic reaction typically causes itching, congestion, or drainage, and ...Read more