Seasonal allergies, outside allergy season

You might be thinking that with summer in full swing now, Japan's seasonal allergies are behind us until Autumn.  No more cedar pollen means no more itchy eyes, masks, or endless tissues. However, there’s another problem that many people don’t realize is connected to hay fever: oral allergy syndrome (OAS), a reaction that happens when certain fruits, vegetables, or nuts cross‑react with pollen allergies.

I was reminded of this today when I had an oral allergy syndrome reaction to Starbucks' seasonal peach drink. I am not allergic to peach on paper, yet I still react because OAS happens when the proteins in some foods are similar to the proteins in pollen. When your immune system is already sensitized, especially to cedar, birch, or grass, it can mistake fresh foods for pollen and react. The symptoms are usually mild and appear quickly: tingling lips, an itchy mouth, a scratchy throat, or slight swelling after eating raw fruits or vegetables.

In Japan, OAS is often linked to birch pollen and cedar pollen, which can cross‑react with foods like apples, peaches, cherries, kiwifruit, tomatoes, and sometimes nuts. Many people don’t connect the dots, especially if they only experience symptoms during peak pollen season. They assume the food “didn’t agree with them,” when in reality it’s their seasonal allergies showing up in a different way.

Most cases of OAS are mild, but anyone experiencing persistent or worsening symptoms should speak with a qualified healthcare professional. They can help determine whether pollen allergies are contributing and discuss strategies for managing symptoms safely, so that you don't end up dealing with 'seasonal' allergies, outside allergy season!