When certain plants start to grow again, they release tiny particles called pollen into the air. These particles can enter the noses, eyes, and mouths of people nearby. For some, this is no problem at all. But for others, their body reacts as if there is danger. The immune system starts to fight these particles even though they are not harmful. This causes sneezing, watery eyes, a stuffy nose, and even an itchy throat.
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