Diet Modification :
If you are allergic to pollens, symptoms may get worse (or you may notice new ones like an itchy mouth) after eating produce that contains proteins similar to those pollens. For instance, apples and cherries cross-react with birch tree pollens. For instance, apples and cherries cross-react with birch tree pollen, bananas, and cucumbers with ragweed. If certain foods trigger a reaction, avoid eating them raw: cooked versions are fine, as heat breaks down the offending proteins.
Studies have shown that boosting the body's friendly bacteria with probiotics (found in supplements or in foods such as yogurt or miso) may help prevent and relieve nasal allergies, possibly by regulating the immune systems' response. Clinical trials haven't determined which strains work best, but studies often use lactobacilli and bifidobacteria strains in doses of 2 billion to 5 billion colony-forming units once or twice daily.