Hay fever，花粉過敏 Hay fever symptoms ，花粉熱症狀

Hay fever happens when your body’s immune system reacts to pollen during spring season. Learn about the hay fever symptoms and how to avoid it. 在春季，当身体的免疫系统在对花粉作出反应时，就会出現花粉熱。認識季節性過敏性鼻炎症状及如何預防。