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An OAS reaction usually comes on swiftly and can recede just as quickly. You’re sitting there eating and all of a sudden, your lips (or tongue and palate) begin to swell. There might tingle or itch at the back of your throat, or you might start to sneeze, have the urge to blow your nose [...]

If you have oral allergy syndrome, chances are that you also have seasonal allergies to pollen from trees such as birch and alder, or you’re allergic to ragweed or grass pollens. Roughly one-third of North Americans with pollen-related allergies are thought to be affected. It’s not clear why the other two-thirds of hay fever sufferers [...]