Oral allergy syndrome is caused by cross-reactivity between pollens proteins in the air created by grass, weeds and plants and certain foods we ingest. Raw and fresh fruits are the most commonly linked to the condition. Basically, your body reacts to a certain food as if you were putting the pollen proteins in your mouth.
Common Symptoms
In most people who are susceptible to oral allergy syndrome, an allergic reaction takes place when the food is put in the mouth. Common reactions include symptoms that are similar to those suffered in an allergy attack, including itchiness and swelling in the mouth, throat, face, lips and tongue.
Severe Symptoms
With oral allergy syndrome, a severe reaction is possible. According to the American Academy of Allergies, Asthma and Immunology, a severe allergic reaction can happen the first time someone predisposed to oral allergy syndrome has an attack, and attacks can happen at any time of the year. Symptoms of a severe allergic reaction to a certain food include pronounced throat swelling and a systemic reaction in the entire body.
Relief and Treatment
Generally, there is no need for any sort of medical treatment, because oral allergy syndrome doesn't normally happen that often. One way to avoid a reaction to certain foods that you've reacted to before is to cook them, which really doesn't sound that appetizing when you're talking about fruit. You can get an antihistamine to help relieve the swelling during and after an attack. If symptoms are severe, immunology treatment is a useful course of action.


