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One of the key reasons strawberries can trigger OAS is a phenomenon known as pollen-fruit cross-reactivity. Many fruits, including strawberries, have proteins that are similar to those found in certain pollens. For instance, a child who is allergic to birch pollen might also react to strawberries. In these cases, their immune system mistakes the proteins in the fruit for pollen, causing that distinct itchy sensation in the mouth.

Interestingly, cooking or processing strawberries can change these proteins, making them much less likely to cause a reaction. This is why some children can enjoy strawberry jam or a slice of strawberry shortcake without any issues, even though eating fresh strawberries causes them irritation.

Allergies vs. Sensitivities: What’s the Difference?

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